http://openhpsdr.org/wiki/api.php?action=feedcontributions&user=M0KHZ&feedformat=atomHPSDRwiki - User contributions [en]2024-03-28T11:26:25ZUser contributionsMediaWiki 1.26.0http://openhpsdr.org/wiki/index.php?title=EXPERIMENTERS-CORNER&diff=3956EXPERIMENTERS-CORNER2011-01-26T19:35:06Z<p>M0KHZ: </p>
<hr />
<div>This area is for discussing and stirring ideas that are not yet projects of HPSDR. If you would like to add to this area or edit existing material, please apply to the "Wiki Sysop" for log in authorization. Email "ae5k" at "openhpsdr" dot "org" and specifically mention the "Experimenters Corner" in your request. Please use courtesy and common sense in what you place here and remove old stuff no longer applicable or of interest. The Wiki Sysop reserves the right to edit or remove material deemed in his opinion not appropriate and to revoke log in authorization for any abusers.<br />
<br />
<br />
'''Vector Network Analyzer for Phoenix'''<br />
<br />
The block diagram for the Phoenix is so similar to that of a vector network analyzer that it would be a shame if we didn't include that capability in the Phoenix.<br />
<br />
[[Image:VNA1.JPG]]<br />
<br />
The idea is that we want to measure the vector that is described by having a length R and angle theta. The low pass filters give us 1/2 R cos( theta ) and 1/2 R sin( theta ), which are the Cartesian coordinates of that vector, just what we want.<br />
<br />
<br />
This is only a starting point for the block diagram. We need to do some thinking about how to best integrate it into the Phoenix without compromising the present goals of the Phoenix. Post your ideas here!<br />
<br />
[[Category:Maturity level]]<br />
<br />
<br />
'''Artemis - A PIC based Web Server with lots of I/O to control'''<br />
<br />
Project proposal block diagram:<br />
<br />
Following advice from Lyle KK7P the proposed PIC is now a PIC32MX695F512L, more memory & 4 SPI ports and same cost :) Block diagram updated to reflect, see below:<br />
<br />
<br />
[[Media:Artemis_Block_Diagram_Rev_0_2.pdf|Artemis_Block_Diagram_Rev_0_2.pdf]]<br />
<br />
Lets talk terminal blocks... using double stacked screw terminal blocks simular to this:<br />
<br />
[[Media:Double_Stack_Terminal_Block.pdf|Double_Stack_Terminal_Block.pdf]]<br />
we can achieve 36 connections to the outside world (18 x 18).<br />
<br />
If we have any spare I/O (very probably) we could add an internal IDC connector or two.<br />
Or tripple stack the terminal blocks, providing 54 screw termainals, with something like this:<br />
<br />
[[Media:Tripple_Stack_Terminal_Block.pdf|Tripple_Stack_Terminal_Block.pdf]]<br />
<br />
Suggestions welcome.<br />
<br />
Following correspondence with Jeremy NH6Z a revised PHY solution has been incorporated, Artemis can now function as a 4 port switch, for example, port 1 to network, port 2 to Metis, port 3 to Hermes, port 4 second Metis, port 5 (internal) to Artemis.<br />
<br />
Block diagram updated to reflect, see below:<br />
<br />
[[Media:Artemis_Block_Diagram_Rev_0_3.pdf|Artemis_Block_Diagram_Rev_0_3.pdf]]<br />
<br />
Although comments from Chris and Lyle regarding an Atom CPU solution are clearly attractive, and inexpensive, I am still contemplating a PIC based solution (not much fun replicating an existing design - HI )<br />
<br />
Please keep the ideas coming.</div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=File:Artemis_Block_Diagram_Rev_0_3.pdf&diff=3955File:Artemis Block Diagram Rev 0 3.pdf2011-01-26T19:21:53Z<p>M0KHZ: </p>
<hr />
<div></div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=EXPERIMENTERS-CORNER&diff=3954EXPERIMENTERS-CORNER2011-01-25T17:51:32Z<p>M0KHZ: </p>
<hr />
<div>This area is for discussing and stirring ideas that are not yet projects of HPSDR. If you would like to add to this area or edit existing material, please apply to the "Wiki Sysop" for log in authorization. Email "ae5k" at "openhpsdr" dot "org" and specifically mention the "Experimenters Corner" in your request. Please use courtesy and common sense in what you place here and remove old stuff no longer applicable or of interest. The Wiki Sysop reserves the right to edit or remove material deemed in his opinion not appropriate and to revoke log in authorization for any abusers.<br />
<br />
<br />
'''Vector Network Analyzer for Phoenix'''<br />
<br />
The block diagram for the Phoenix is so similar to that of a vector network analyzer that it would be a shame if we didn't include that capability in the Phoenix.<br />
<br />
[[Image:VNA1.JPG]]<br />
<br />
The idea is that we want to measure the vector that is described by having a length R and angle theta. The low pass filters give us 1/2 R cos( theta ) and 1/2 R sin( theta ), which are the Cartesian coordinates of that vector, just what we want.<br />
<br />
<br />
This is only a starting point for the block diagram. We need to do some thinking about how to best integrate it into the Phoenix without compromising the present goals of the Phoenix. Post your ideas here!<br />
<br />
[[Category:Maturity level]]<br />
<br />
<br />
'''Artemis - A PIC based Web Server with lots of I/O to control'''<br />
<br />
Project proposal block diagram:<br />
<br />
Following advice from Lyle KK7P the proposed PIC is now a PIC32MX695F512L, more memory & 4 SPI ports and same cost :) Block diagram updated to reflect, see below:<br />
<br />
<br />
[[Media:Artemis_Block_Diagram_Rev_0_2.pdf|Artemis_Block_Diagram_Rev_0_2.pdf]]<br />
<br />
Lets talk terminal blocks... using double stacked screw terminal blocks simular to this:<br />
<br />
[[Media:Double_Stack_Terminal_Block.pdf|Double_Stack_Terminal_Block.pdf]]<br />
we can achieve 36 connections to the outside world (18 x 18).<br />
<br />
If we have any spare I/O (very probably) we could add an internal IDC connector or two.<br />
Or tripple stack the terminal blocks, providing 54 screw termainals, with something like this:<br />
<br />
[[Media:Tripple_Stack_Terminal_Block.pdf|Tripple_Stack_Terminal_Block.pdf]]<br />
<br />
Suggestions welcome.</div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=File:Tripple_Stack_Terminal_Block.pdf&diff=3953File:Tripple Stack Terminal Block.pdf2011-01-25T17:46:24Z<p>M0KHZ: </p>
<hr />
<div></div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=EXPERIMENTERS-CORNER&diff=3952EXPERIMENTERS-CORNER2011-01-25T17:45:58Z<p>M0KHZ: </p>
<hr />
<div>This area is for discussing and stirring ideas that are not yet projects of HPSDR. If you would like to add to this area or edit existing material, please apply to the "Wiki Sysop" for log in authorization. Email "ae5k" at "openhpsdr" dot "org" and specifically mention the "Experimenters Corner" in your request. Please use courtesy and common sense in what you place here and remove old stuff no longer applicable or of interest. The Wiki Sysop reserves the right to edit or remove material deemed in his opinion not appropriate and to revoke log in authorization for any abusers.<br />
<br />
<br />
'''Vector Network Analyzer for Phoenix'''<br />
<br />
The block diagram for the Phoenix is so similar to that of a vector network analyzer that it would be a shame if we didn't include that capability in the Phoenix.<br />
<br />
[[Image:VNA1.JPG]]<br />
<br />
The idea is that we want to measure the vector that is described by having a length R and angle theta. The low pass filters give us 1/2 R cos( theta ) and 1/2 R sin( theta ), which are the Cartesian coordinates of that vector, just what we want.<br />
<br />
<br />
This is only a starting point for the block diagram. We need to do some thinking about how to best integrate it into the Phoenix without compromising the present goals of the Phoenix. Post your ideas here!<br />
<br />
[[Category:Maturity level]]<br />
<br />
<br />
'''Artemis - A PIC based Web Server with lots of I/O to control'''<br />
<br />
Project proposal block diagram:<br />
<br />
Following advice from Lyle KK7P the proposed PIC is now a PIC32MX695F512L, more memory & 4 SPI ports and same cost :) Block diagram updated to reflect, see below:<br />
<br />
<br />
[[Media:Artemis_Block_Diagram_Rev_0_2.pdf|Artemis_Block_Diagram_Rev_0_2.pdf]]<br />
<br />
Lets talk terminal blocks... using double stacked screw terminal blocks simular to this:<br />
<br />
[[Media:Double_Stack_Terminal_Block.pdf|Double_Stack_Terminal_Block.pdf]]<br />
we can achieve 36 connections to the outside world (18 x 18).<br />
<br />
If we have any spare I/O (very probably) we could add an internal IDC connector or two.<br />
Or tripple stack the terminal blocks with something like this:</div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=File:Double_Stack_Terminal_Block.pdf&diff=3951File:Double Stack Terminal Block.pdf2011-01-25T17:40:41Z<p>M0KHZ: </p>
<hr />
<div></div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=EXPERIMENTERS-CORNER&diff=3950EXPERIMENTERS-CORNER2011-01-25T17:33:57Z<p>M0KHZ: </p>
<hr />
<div>This area is for discussing and stirring ideas that are not yet projects of HPSDR. If you would like to add to this area or edit existing material, please apply to the "Wiki Sysop" for log in authorization. Email "ae5k" at "openhpsdr" dot "org" and specifically mention the "Experimenters Corner" in your request. Please use courtesy and common sense in what you place here and remove old stuff no longer applicable or of interest. The Wiki Sysop reserves the right to edit or remove material deemed in his opinion not appropriate and to revoke log in authorization for any abusers.<br />
<br />
<br />
'''Vector Network Analyzer for Phoenix'''<br />
<br />
The block diagram for the Phoenix is so similar to that of a vector network analyzer that it would be a shame if we didn't include that capability in the Phoenix.<br />
<br />
[[Image:VNA1.JPG]]<br />
<br />
The idea is that we want to measure the vector that is described by having a length R and angle theta. The low pass filters give us 1/2 R cos( theta ) and 1/2 R sin( theta ), which are the Cartesian coordinates of that vector, just what we want.<br />
<br />
<br />
This is only a starting point for the block diagram. We need to do some thinking about how to best integrate it into the Phoenix without compromising the present goals of the Phoenix. Post your ideas here!<br />
<br />
[[Category:Maturity level]]<br />
<br />
<br />
'''Artemis - A PIC based Web Server with lots of I/O to control'''<br />
<br />
Project proposal block diagram:<br />
<br />
Following advice from Lyle KK7P the proposed PIC is now a PIC32MX695F512L, more memory & 4 SPI ports and same cost :) Block diagram updated to reflect, see below: <br />
[[Media:Artemis_Block_Diagram_Rev_0_2.pdf|Artemis_Block_Diagram_Rev_0_2.pdf]]</div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=File:Artemis_Block_Diagram_Rev_0_2.pdf&diff=3949File:Artemis Block Diagram Rev 0 2.pdf2011-01-25T17:29:24Z<p>M0KHZ: </p>
<hr />
<div></div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=EXPERIMENTERS-CORNER&diff=3948EXPERIMENTERS-CORNER2011-01-24T19:20:06Z<p>M0KHZ: </p>
<hr />
<div>This area is for discussing and stirring ideas that are not yet projects of HPSDR. If you would like to add to this area or edit existing material, please apply to the "Wiki Sysop" for log in authorization. Email "ae5k" at "openhpsdr" dot "org" and specifically mention the "Experimenters Corner" in your request. Please use courtesy and common sense in what you place here and remove old stuff no longer applicable or of interest. The Wiki Sysop reserves the right to edit or remove material deemed in his opinion not appropriate and to revoke log in authorization for any abusers.<br />
<br />
<br />
'''Vector Network Analyzer for Phoenix'''<br />
<br />
The block diagram for the Phoenix is so similar to that of a vector network analyzer that it would be a shame if we didn't include that capability in the Phoenix.<br />
<br />
[[Image:VNA1.JPG]]<br />
<br />
The idea is that we want to measure the vector that is described by having a length R and angle theta. The low pass filters give us 1/2 R cos( theta ) and 1/2 R sin( theta ), which are the Cartesian coordinates of that vector, just what we want.<br />
<br />
<br />
This is only a starting point for the block diagram. We need to do some thinking about how to best integrate it into the Phoenix without compromising the present goals of the Phoenix. Post your ideas here!<br />
<br />
[[Category:Maturity level]]<br />
<br />
<br />
'''Artemis - A PIC based Web Server with lots of I/O to control'''<br />
<br />
Project proposal block diagram:<br />
<br />
[[Media:Artemis_Block_Diagram_Rev_0_1.pdf|Artemis_Block_Diagram_Rev_0_1.pdf]]</div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=File:Artemis_Block_Diagram_Rev_0_1.pdf&diff=3947File:Artemis Block Diagram Rev 0 1.pdf2011-01-24T19:18:35Z<p>M0KHZ: </p>
<hr />
<div></div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=EXPERIMENTERS-CORNER&diff=3946EXPERIMENTERS-CORNER2011-01-24T19:13:21Z<p>M0KHZ: </p>
<hr />
<div>This area is for discussing and stirring ideas that are not yet projects of HPSDR. If you would like to add to this area or edit existing material, please apply to the "Wiki Sysop" for log in authorization. Email "ae5k" at "openhpsdr" dot "org" and specifically mention the "Experimenters Corner" in your request. Please use courtesy and common sense in what you place here and remove old stuff no longer applicable or of interest. The Wiki Sysop reserves the right to edit or remove material deemed in his opinion not appropriate and to revoke log in authorization for any abusers.<br />
<br />
<br />
'''Vector Network Analyzer for Phoenix'''<br />
<br />
The block diagram for the Phoenix is so similar to that of a vector network analyzer that it would be a shame if we didn't include that capability in the Phoenix.<br />
<br />
[[Image:VNA1.JPG]]<br />
<br />
The idea is that we want to measure the vector that is described by having a length R and angle theta. The low pass filters give us 1/2 R cos( theta ) and 1/2 R sin( theta ), which are the Cartesian coordinates of that vector, just what we want.<br />
<br />
<br />
This is only a starting point for the block diagram. We need to do some thinking about how to best integrate it into the Phoenix without compromising the present goals of the Phoenix. Post your ideas here!<br />
<br />
[[Category:Maturity level]]<br />
<br />
<br />
'''Artemis - A PIC based Web Server with lots of I/O to control'''<br />
<br />
Project proposal block diagram:</div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=GRIFFIN&diff=3635GRIFFIN2010-08-23T17:49:07Z<p>M0KHZ: </p>
<hr />
<div>[[Image:Griffin.jpg|thumb|100px]]<br />
'''GRIFFIN - Stand alone beacon board'''<br />
<br />
Block Diagram <br />
<br />
[[Image:Griffin_Block_Diagram_Rev_1_0.pdf]] <br />
<br />
Many will be aware of the work undertaken by Bill, KD5TFD, to develop FPGA<br />
code that enables Penelope to operate as a stand alone WSPR beacon. Not<br />
only does his code allow a full implementation of the WSPR protocol, without<br />
the need to connect to a PC, it also enables multiple beacons to operate<br />
simultaneously on multiple bands. This is the dual of multiple independent<br />
receives in a Mercury - multiple independent transmitters in a Penny.<br />
<br />
More details of Bill's work can be found here:<br />
<br />
svn://64.245.179.219/svn/repos_sdr_hpsdr/trunk/PennyWSPR <br />
<br />
There's a README file at:<br />
<br />
svn://64.245.179.219/svn/repos_sdr_hpsdr/trunk/PennyWSPR/README.txt<br />
<br />
One of the advantages we have in the way that HPSDR has evolved is the<br />
ability to try new modes without the need to build or buy new hardware.<br />
Here's another example.<br />
<br />
Many CW operators will remember the time when a CW report, say 559, also<br />
sometimes included a 'C' at the end (e.g. 559C) which indicated the received<br />
signal had a 'chip' i.e. unstable when keyed, FM etc.<br />
<br />
Chirp was regarded as an undesirable feature and best to let the operator<br />
know. There was also the practice of adding an 'H' to the report<br />
indicating Hum. The story goes that the difficulty in obtaining high<br />
voltage smoothing capacitors in Eastern Europe resulted in some operators<br />
applying un-smoothed rectified mains to the anode/plate of the PA stage<br />
giving it a distinctive err... note. However, a story for another day<br />
perhaps.<br />
<br />
The introduction of digital/HDTV in many parts of the world has triggered <br />
the removal of the analogue TV broadcasters that are/were located adjacent <br />
to the 6m band. Magic Band operators often use these stations as an indicator<br />
of propagation conditions. Since they typically run much higher ERP than<br />
Amateur stations, 10's of kW, they were/are an ideal source of propagation<br />
beacons.<br />
<br />
With the removal of these services in many parts of the world 6m operators<br />
loose a very valuable source of propagation information. It's just this <br />
problem that has lead Andrew Martin, VK30E, to develop an alternative that can be used<br />
in either a RADAR or beacon mode.<br />
<br />
Andrew describes his technique fully in the 2/2010 edition of DUBUS<br />
<br />
http://www.marsport.org.uk/dubus/last.htm<br />
<br />
but here's the basic idea.<br />
<br />
We deliberately, repeatedly, linearly sweep the frequency of a carrier over<br />
1kHz in one second. The nominal frequency of the carrier is derived from a<br />
GPS locked 10MHz reference. The start of the one second sweep is<br />
synchronised to the 1 PPS signal from a GPS.<br />
<br />
At the receiver we use a matched filter, again triggered from a 1 PPS signal<br />
from a GPS, to detect the signal. The matched filter in this case runs on<br />
your PC and uses your sound card or VAC to digitise the received signal.<br />
<br />
The effect is similar to WSPR. However, we trade RF bandwidth for time - in<br />
which case the output of the matched filter is available every second rather<br />
then every few minutes as in the case of WSPR. We also gain a signal<br />
processing advantage over WSPR which typically can decode at -26dB in a<br />
2.7kHz bandwidth. 'Chirp' will decode at -36dB in the same bandwidth. If we<br />
integrate multiple chirp signals over say 1 minute then the processing gain<br />
increases to -54dB.<br />
<br />
So if we run a 100W amateur beacon by applying a chirp to the signal we<br />
effectively have a 400kW signal - in line with the TV transmitters we are<br />
trying to replace.<br />
<br />
Initial tests on 20m between Andrew and Don, VK6HK over a 2700Km path, have <br />
shown the technique to work such that a barely audible SSB signal gives a <br />
spike with a 45dB S/N ratio at the output of the matched filter.<br />
<br />
This is chirp in the beacon mode.<br />
<br />
Alternatively, one station can transmit a<br />
chirp signal, using full power and a beam, in a certain direction and<br />
another station listens beaming in the same direction. The stations need to<br />
be sufficiently far apart such that the transmitting station does not<br />
overload the receiver of the receiving station.<br />
<br />
The receiving station will then receive echoes of the transmitted signal<br />
from the various mediums in the direction he is beaming. Since his matched<br />
filter is triggered at exactly the same time as the transmitting station he<br />
can plot of graph of signal strength against distance in miles/km. Such a<br />
graph can clearly show the presence of single and multi hop E's and their<br />
intensity. Andrew's DUBUS article has some very interesting examples of<br />
enhanced 6m propagation that chirp is able to identify.<br />
<br />
The free sound card software Spectrum Lab:<br />
<br />
http://www.qsl.net/dl4yhf/spectra1.html <br />
<br />
will both generate and demodulate chirp signals.<br />
<br />
What would be interesting would be to have a single board that generates a<br />
chirp modulated carrier and could be used as the replacement for the low<br />
level drive stage in a conventional 6m beacon. You guessed it - Penelope!<br />
<br />
Bill kindly offered to take on this 'Weekender Project' (which did actually<br />
fit in a weekend for once!) and produced a version of his PennyWSPR code<br />
that included BOTH a chirp and WSPR beacon and would trigger on the 1 PPS<br />
from a GPS receiver. The nominal frequency of the beacons is at 50.3MHz<br />
(for initial testing) with the chirp extending from 300Hz to 1300Hz above<br />
this and the WSPR beacon 1500Hz above. The WSPR beacon is 6dB below the<br />
power level of the chirp beacon.<br />
<br />
Since VHF beacons in VK are allocated on a 2kHz channel spacing the spectrum <br />
of the two signals fits nicely within an allocated channel.<br />
<br />
Work is also in progress to look at including an aural CW ident on the <br />
allocated carrier frequency.<br />
<br />
Testing is about to start and I'll report progress in due course.<br />
<br />
If testing is successful then we intend to develop an FPGA based PCB that <br />
will provide a 6m/2m beacon exciter stage. The board is intended to be used <br />
as a replacement for the low level driver board in an existing beacon. As <br />
well as the FGPA, power supplies etc, it will include a GPS receiver and <br />
oven controlled 10MHz reference.<br />
<br />
The project leaders for the board was Phil VK6APH and Kevin M0KHZ.<br />
<br />
<br />
[[Category:Future hardware]]</div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=File:Griffin_Block_Diagram_Rev_1_0.pdf&diff=3634File:Griffin Block Diagram Rev 1 0.pdf2010-08-23T17:47:29Z<p>M0KHZ: </p>
<hr />
<div></div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=GRIFFIN&diff=3633GRIFFIN2010-08-22T16:39:26Z<p>M0KHZ: </p>
<hr />
<div>[[Image:Griffin.jpg|thumb|100px]]<br />
'''GRIFFIN - Stand alone beacon board'''<br />
<br />
Block Diagram <br />
<br />
[[Image:Visio-WSPR_Chirp_TRX_Rev_0.6.pdf]] <br />
<br />
Many will be aware of the work undertaken by Bill, KD5TFD, to develop FPGA<br />
code that enables Penelope to operate as a stand alone WSPR beacon. Not<br />
only does his code allow a full implementation of the WSPR protocol, without<br />
the need to connect to a PC, it also enables multiple beacons to operate<br />
simultaneously on multiple bands. This is the dual of multiple independent<br />
receives in a Mercury - multiple independent transmitters in a Penny.<br />
<br />
More details of Bill's work can be found here:<br />
<br />
svn://64.245.179.219/svn/repos_sdr_hpsdr/trunk/PennyWSPR <br />
<br />
There's a README file at:<br />
<br />
svn://64.245.179.219/svn/repos_sdr_hpsdr/trunk/PennyWSPR/README.txt<br />
<br />
One of the advantages we have in the way that HPSDR has evolved is the<br />
ability to try new modes without the need to build or buy new hardware.<br />
Here's another example.<br />
<br />
Many CW operators will remember the time when a CW report, say 559, also<br />
sometimes included a 'C' at the end (e.g. 559C) which indicated the received<br />
signal had a 'chip' i.e. unstable when keyed, FM etc.<br />
<br />
Chirp was regarded as an undesirable feature and best to let the operator<br />
know. There was also the practice of adding an 'H' to the report<br />
indicating Hum. The story goes that the difficulty in obtaining high<br />
voltage smoothing capacitors in Eastern Europe resulted in some operators<br />
applying un-smoothed rectified mains to the anode/plate of the PA stage<br />
giving it a distinctive err... note. However, a story for another day<br />
perhaps.<br />
<br />
The introduction of digital/HDTV in many parts of the world has triggered <br />
the removal of the analogue TV broadcasters that are/were located adjacent <br />
to the 6m band. Magic Band operators often use these stations as an indicator<br />
of propagation conditions. Since they typically run much higher ERP than<br />
Amateur stations, 10's of kW, they were/are an ideal source of propagation<br />
beacons.<br />
<br />
With the removal of these services in many parts of the world 6m operators<br />
loose a very valuable source of propagation information. It's just this <br />
problem that has lead Andrew Martin, VK30E, to develop an alternative that can be used<br />
in either a RADAR or beacon mode.<br />
<br />
Andrew describes his technique fully in the 2/2010 edition of DUBUS<br />
<br />
http://www.marsport.org.uk/dubus/last.htm<br />
<br />
but here's the basic idea.<br />
<br />
We deliberately, repeatedly, linearly sweep the frequency of a carrier over<br />
1kHz in one second. The nominal frequency of the carrier is derived from a<br />
GPS locked 10MHz reference. The start of the one second sweep is<br />
synchronised to the 1 PPS signal from a GPS.<br />
<br />
At the receiver we use a matched filter, again triggered from a 1 PPS signal<br />
from a GPS, to detect the signal. The matched filter in this case runs on<br />
your PC and uses your sound card or VAC to digitise the received signal.<br />
<br />
The effect is similar to WSPR. However, we trade RF bandwidth for time - in<br />
which case the output of the matched filter is available every second rather<br />
then every few minutes as in the case of WSPR. We also gain a signal<br />
processing advantage over WSPR which typically can decode at -26dB in a<br />
2.7kHz bandwidth. 'Chirp' will decode at -36dB in the same bandwidth. If we<br />
integrate multiple chirp signals over say 1 minute then the processing gain<br />
increases to -54dB.<br />
<br />
So if we run a 100W amateur beacon by applying a chirp to the signal we<br />
effectively have a 400kW signal - in line with the TV transmitters we are<br />
trying to replace.<br />
<br />
Initial tests on 20m between Andrew and Don, VK6HK over a 2700Km path, have <br />
shown the technique to work such that a barely audible SSB signal gives a <br />
spike with a 45dB S/N ratio at the output of the matched filter.<br />
<br />
This is chirp in the beacon mode.<br />
<br />
Alternatively, one station can transmit a<br />
chirp signal, using full power and a beam, in a certain direction and<br />
another station listens beaming in the same direction. The stations need to<br />
be sufficiently far apart such that the transmitting station does not<br />
overload the receiver of the receiving station.<br />
<br />
The receiving station will then receive echoes of the transmitted signal<br />
from the various mediums in the direction he is beaming. Since his matched<br />
filter is triggered at exactly the same time as the transmitting station he<br />
can plot of graph of signal strength against distance in miles/km. Such a<br />
graph can clearly show the presence of single and multi hop E's and their<br />
intensity. Andrew's DUBUS article has some very interesting examples of<br />
enhanced 6m propagation that chirp is able to identify.<br />
<br />
The free sound card software Spectrum Lab:<br />
<br />
http://www.qsl.net/dl4yhf/spectra1.html <br />
<br />
will both generate and demodulate chirp signals.<br />
<br />
What would be interesting would be to have a single board that generates a<br />
chirp modulated carrier and could be used as the replacement for the low<br />
level drive stage in a conventional 6m beacon. You guessed it - Penelope!<br />
<br />
Bill kindly offered to take on this 'Weekender Project' (which did actually<br />
fit in a weekend for once!) and produced a version of his PennyWSPR code<br />
that included BOTH a chirp and WSPR beacon and would trigger on the 1 PPS<br />
from a GPS receiver. The nominal frequency of the beacons is at 50.3MHz<br />
(for initial testing) with the chirp extending from 300Hz to 1300Hz above<br />
this and the WSPR beacon 1500Hz above. The WSPR beacon is 6dB below the<br />
power level of the chirp beacon.<br />
<br />
Since VHF beacons in VK are allocated on a 2kHz channel spacing the spectrum <br />
of the two signals fits nicely within an allocated channel.<br />
<br />
Work is also in progress to look at including an aural CW ident on the <br />
allocated carrier frequency.<br />
<br />
Testing is about to start and I'll report progress in due course.<br />
<br />
If testing is successful then we intend to develop an FPGA based PCB that <br />
will provide a 6m/2m beacon exciter stage. The board is intended to be used <br />
as a replacement for the low level driver board in an existing beacon. As <br />
well as the FGPA, power supplies etc, it will include a GPS receiver and <br />
oven controlled 10MHz reference.<br />
<br />
The project leaders for the board was Phil VK6APH and Kevin M0KHZ.<br />
<br />
<br />
[[Category:Future hardware]]</div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=Apollo_-_Development_Discussion&diff=2795Apollo - Development Discussion2009-12-18T18:06:47Z<p>M0KHZ: </p>
<hr />
<div>[[Image:Apollo_Schematic_rev_1A-1.jpg|thumb|400px|Rev 1A, page 1, of the Apollo schematic. Click for larger images.]]<br />
The initial [[APOLLO]] schematic is available for comment and suggestions are desired. Please place them here or email to the mailing list [mailto:hpsdr@lists.openhpsdr.org hpsdr@lists.openhpsdr.org] or direct email to [mailto:la2ni@online.no Kjell Karlsen]<br />
[[Image:Apollo_Schematic_rev_1A-2.jpg|thumb|400px|Rev 1A, page 2, of the Apollo schematic. Click for larger images.]]<br />
-----<br />
<br />
The New PDF version of the schematic is here: [[media:Apollo_Schematic_rev_1A.pdf|PDF Rev 1A Schematic]].<br />
<br />
The Silkscreen Top here: [[media:Apollo_silk_top.pdf|Silkscreen Top, Rev 1A]].<br />
<br />
The Silkscreen Bottom is here: [[media:ApolloSilkBottom.pdf|Silkscreen Bottom, Rev 1A]].<br />
<br />
The PCB Top here: [[media:ApolloPCBTop.pdf|PCB Top, Rev 1A]].<br />
<br />
The PCB Bottom is here: [[media:ApolloPCBBottom.pdf|PCB Bottom, Rev 1A]].<br />
<br />
Added for '''LA2NI, Kjell''' by -- [[User:KV0S|KV0S, Dave]] 16:38, 10 October 2009 (UTC)<br />
<br />
<br />
----<br />
<br />
<br />
Update 16 December 2009, the latest schematics can be found here : [[media:Apollo151209.pdf|PDF Rev 1D Schematic]].<br />
<br />
<br />
----<br />
<br />
Update 18 December 2009, here is a high resolution picture of Kjell's alpha Apollo board, looking very good :)<br />
<br />
: [[media:Apollo_PCB_003.jpg|High Res Alpha.jpg]].<br />
<br />
----<br />
<br />
<br />
The original PDF version of the schematic is here: [[media:Apollo_rev_0.pdf|PDF rev 0 Schematic]].<br />
<br />
<hr><br />
Three comments:<br />
#I believe the interface is SPI rather than I2C for the TPIC595 latches.<br />
#74HC14 can be used in lieu of 74HC04. The '14 has Schmitt trigger inputs, might help with noise immunity on the control line(s).<br />
#Suggest considering PIN diode antenna switching instead of a relay (RL15). For those who operate CW QSK, quiet is nice. It's even nice for those who don't :-). [[User:KK7P|KK7P]] 21:22, 14 June 2009 (UTC)<br />
<hr><br />
:Another comment: An Elecraft T-1 could also be accommodated at these power levels as an alternative to the suggested LDG. Disclaimer: I work for Elecraft. [[User:KK7P|KK7P]] 05:02 31 July 2009 (UTC)</div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=File:Apollo_PCB_003.jpg&diff=2794File:Apollo PCB 003.jpg2009-12-18T18:02:32Z<p>M0KHZ: </p>
<hr />
<div></div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=Apollo_-_Development_Discussion&diff=2767Apollo - Development Discussion2009-12-16T20:49:01Z<p>M0KHZ: </p>
<hr />
<div>[[Image:Apollo_Schematic_rev_1A-1.jpg|thumb|400px|Rev 1A, page 1, of the Apollo schematic. Click for larger images.]]<br />
The initial [[APOLLO]] schematic is available for comment and suggestions are desired. Please place them here or email to the mailing list [mailto:hpsdr@lists.openhpsdr.org hpsdr@lists.openhpsdr.org] or direct email to [mailto:la2ni@online.no Kjell Karlsen]<br />
[[Image:Apollo_Schematic_rev_1A-2.jpg|thumb|400px|Rev 1A, page 2, of the Apollo schematic. Click for larger images.]]<br />
-----<br />
<br />
The New PDF version of the schematic is here: [[media:Apollo_Schematic_rev_1A.pdf|PDF Rev 1A Schematic]].<br />
<br />
The Silkscreen Top here: [[media:Apollo_silk_top.pdf|Silkscreen Top, Rev 1A]].<br />
<br />
The Silkscreen Bottom is here: [[media:ApolloSilkBottom.pdf|Silkscreen Bottom, Rev 1A]].<br />
<br />
The PCB Top here: [[media:ApolloPCBTop.pdf|PCB Top, Rev 1A]].<br />
<br />
The PCB Bottom is here: [[media:ApolloPCBBottom.pdf|PCB Bottom, Rev 1A]].<br />
<br />
Added for '''LA2NI, Kjell''' by -- [[User:KV0S|KV0S, Dave]] 16:38, 10 October 2009 (UTC)<br />
<br />
<br />
----<br />
<br />
<br />
Update 16 December 2008, the latest schematics can be found here : [[media:Apollo151209.pdf|PDF Rev 1D Schematic]].<br />
<br />
<br />
----<br />
<br />
<br />
The original PDF version of the schematic is here: [[media:Apollo_rev_0.pdf|PDF rev 0 Schematic]].<br />
<br />
<hr><br />
Three comments:<br />
#I believe the interface is SPI rather than I2C for the TPIC595 latches.<br />
#74HC14 can be used in lieu of 74HC04. The '14 has Schmitt trigger inputs, might help with noise immunity on the control line(s).<br />
#Suggest considering PIN diode antenna switching instead of a relay (RL15). For those who operate CW QSK, quiet is nice. It's even nice for those who don't :-). [[User:KK7P|KK7P]] 21:22, 14 June 2009 (UTC)<br />
<hr><br />
:Another comment: An Elecraft T-1 could also be accommodated at these power levels as an alternative to the suggested LDG. Disclaimer: I work for Elecraft. [[User:KK7P|KK7P]] 05:02 31 July 2009 (UTC)</div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=File:Apollo151209.pdf&diff=2766File:Apollo151209.pdf2009-12-16T20:48:00Z<p>M0KHZ: </p>
<hr />
<div></div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=File:Apollo_REV_1D.pdf&diff=2764File:Apollo REV 1D.pdf2009-12-16T19:04:29Z<p>M0KHZ: </p>
<hr />
<div></div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=Apollo_-_Development_Discussion&diff=2762Apollo - Development Discussion2009-12-16T19:03:55Z<p>M0KHZ: </p>
<hr />
<div>[[Image:Apollo_Schematic_rev_1A-1.jpg|thumb|400px|Rev 1A, page 1, of the Apollo schematic. Click for larger images.]]<br />
The initial [[APOLLO]] schematic is available for comment and suggestions are desired. Please place them here or email to the mailing list [mailto:hpsdr@lists.openhpsdr.org hpsdr@lists.openhpsdr.org] or direct email to [mailto:la2ni@online.no Kjell Karlsen]<br />
[[Image:Apollo_Schematic_rev_1A-2.jpg|thumb|400px|Rev 1A, page 2, of the Apollo schematic. Click for larger images.]]<br />
-----<br />
<br />
The New PDF version of the schematic is here: [[media:Apollo_Schematic_rev_1A.pdf|PDF Rev 1A Schematic]].<br />
<br />
The Silkscreen Top here: [[media:Apollo_silk_top.pdf|Silkscreen Top, Rev 1A]].<br />
<br />
The Silkscreen Bottom is here: [[media:ApolloSilkBottom.pdf|Silkscreen Bottom, Rev 1A]].<br />
<br />
The PCB Top here: [[media:ApolloPCBTop.pdf|PCB Top, Rev 1A]].<br />
<br />
The PCB Bottom is here: [[media:ApolloPCBBottom.pdf|PCB Bottom, Rev 1A]].<br />
<br />
Added for '''LA2NI, Kjell''' by -- [[User:KV0S|KV0S, Dave]] 16:38, 10 October 2009 (UTC)<br />
<br />
<br />
----<br />
<br />
<br />
Update 16 December 2008, the latest schematics can be found here : [[media:Apollo_REV_1D.pdf|PDF Rev 1D Schematic]].<br />
<br />
<br />
----<br />
<br />
<br />
The original PDF version of the schematic is here: [[media:Apollo_rev_0.pdf|PDF rev 0 Schematic]].<br />
<br />
<hr><br />
Three comments:<br />
#I believe the interface is SPI rather than I2C for the TPIC595 latches.<br />
#74HC14 can be used in lieu of 74HC04. The '14 has Schmitt trigger inputs, might help with noise immunity on the control line(s).<br />
#Suggest considering PIN diode antenna switching instead of a relay (RL15). For those who operate CW QSK, quiet is nice. It's even nice for those who don't :-). [[User:KK7P|KK7P]] 21:22, 14 June 2009 (UTC)<br />
<hr><br />
:Another comment: An Elecraft T-1 could also be accommodated at these power levels as an alternative to the suggested LDG. Disclaimer: I work for Elecraft. [[User:KK7P|KK7P]] 05:02 31 July 2009 (UTC)</div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=File:Apollo_Schematic_rev_1D.pdf&diff=2760File:Apollo Schematic rev 1D.pdf2009-12-16T18:59:57Z<p>M0KHZ: </p>
<hr />
<div></div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=HERMES&diff=2537HERMES2009-11-04T10:26:29Z<p>M0KHZ: </p>
<hr />
<div>'''<br />
''' Hermes - A DUC/DDC Transceiver '''<br />
<br />
[[Image:Hardware_Block_Diagram_V1_7.jpg|thumb|500px|Hardware block diagram. Click to enlarge.]]<br />
Project Leader: Kevin M0KHZ<br />
<br />
Following the outstanding success of [[MERCURY|Mercury]] and [[PENELOPE|Penelope]], and while investigating the verilog code for both, I had the insane idea of merging the verilog code of Mercury and Penelope into a single fpga! I played around with this idea for a while and the more I thought about it the more I liked the idea. <br />
<br />
So here is '''<u>the proposal</u>''', '''to develop a single board HPSDR based on the hardware of Mercury and Penelope and a single large fpga.'''<br />
<br />
This board would have PC connectivity by USB. I’m planning to squeeze this all onto Euro Card sized PCB (100 x 160 mm), and if I utilize both sides I might even have room for a [[PENNYWHISTLE|Pennywhistle]] type PA :). <br />
<br />
Basic specs so far (nothing cast in stone)<br />
<br />
*Fpga EP3C25Q240C or EP3C40Q240 (I think this is the largest without BGA pin out)<br />
*Mercury receive chain<br />
*Penelope transmit chain, possible small change to gain distribution<br />
*USB2 to PC data transfer<br />
*Pennywhistle PA (if there’s room)<br />
*10Mhz ext an option<br />
*Alex filter switching header<br />
*2.8W stereo audio PA<br />
*13.5V supply<br />
<br />
Following the tradition of the HPSDR naming convention, I thought Hermes was appropriate as he was known for his invention and theft!<br />
[[Image:P1010663.JPG|thumb|300px|The enclosure I intend to use for the prototype, the euro card will slide in, regulators and PA transistors will be bolted directly to the case and there is plenty of room for additional hardware (LPF's, Beagleboard??? - who knows :))]]<br />
Current status ( 20 April 09 ), Project proposal [[HERMES - Design Discussions|open for comment]]. Looking to nail ‘major’ hardware decisions by the end of the month. Initial draft schematics will then be produced and placed here on the Wiki for comment.<br />
<br />
Update (13 September 09) the initial schematics have been created and can be found here : [[Media:Hermes_RevA5-3.pdf|Hermes_RevA5-3.pdf]]<br />
<br />
Update (27 September 09) following comments regarding the initial schematics, the design has now been frozen for Alpha board development, thank you to all who have contributed, through an HPSDR community effort, Hermes is one step closer to becoming a reality. The updated schematics can be found here :<br />
[[Media:Hermes_RevA7-3.pdf|Hermes_RevA7-3.pdf]]<br />
<br />
Update (9 October 09) Just to wet your appetite, here are the current top & bottom layout details for Hermes.<br />
<br />
[[Media:Hermes_top.pdf|Hermes_top.pdf]]<br />
<br />
[[Media:Hermes_bottom.pdf|Hermes_bottom.pdf]]<br />
<br />
Although not quite finished you can gain an appreciation of the beautiful and artful skills from Tony.<br />
He is doing a fantastic job laying out the 6 layers needed to bring Hermes alive, current plans are to finalise the layout this weekend, shortly followed by an order for the Alpha PCB’s.<br />
<br />
Update (14 October 09) I've uploaded the Alpha PCB foils, costings are being sort and we are planning to order the Alpha boards in the very near future.<br />
<br />
[[Media:Bottom.pdf|Bottom.pdf]]<br />
<br />
[[Media:VCC.pdf|VCC.pdf]]<br />
<br />
[[Media:L4.pdf|L4.pdf]]<br />
<br />
[[Media:L3.pdf|L3.pdf]]<br />
<br />
[[Media:GND.pdf|GND.pdf]]<br />
<br />
[[Media:Top Layer.pdf|Top Layer.pdf]]<br />
<br />
[[Media:SilkScreen Bottom.pdf|Silkscreen Bottom.pdf]]<br />
<br />
[[Media:SilkScreen Top.pdf|Silkscreen Top.pdf]]<br />
<br />
Update (2 November 09) The Alpha PCB's have just been released from the manufacture and are currently in transit to Bill for kitting, pictures can be found here:<br />
<br />
[[Media:DSC00142.jpg|DSC00142.jpg]]<br />
<br />
[[Media:DSC00143.jpg|DSC00143.jpg]]<br />
<br />
Tony has started populating the first board, supplies and FX2 all correct and working, he is now building up the receive chain in preparation for some initial test code Phil is in the process of developing.<br />
<br />
Further updates to follow shortly.<br />
<br />
<br />
<br />
[[Apollo]] is a combined 15w PA and Low Pass Filter bank. The Apollo project is led by Kjell Karlsen LA2NI .<br />
<br />
''' Please see [[HERMES - Design Discussions]]'''</div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=File:Hardware_Block_Diagram_V1_7.jpg&diff=2536File:Hardware Block Diagram V1 7.jpg2009-11-04T10:25:30Z<p>M0KHZ: </p>
<hr />
<div></div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=File:Hardware_Block_Diagram_V1.7.jpg&diff=2535File:Hardware Block Diagram V1.7.jpg2009-11-04T10:23:55Z<p>M0KHZ: </p>
<hr />
<div></div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=File:Hardware_Block_Diagram_V1_7.pdf&diff=2534File:Hardware Block Diagram V1 7.pdf2009-11-04T10:17:33Z<p>M0KHZ: </p>
<hr />
<div></div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=File:Hardware_Block_Diagram_V1.7.pdf&diff=2533File:Hardware Block Diagram V1.7.pdf2009-11-04T10:15:11Z<p>M0KHZ: </p>
<hr />
<div></div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=HERMES&diff=2506HERMES2009-11-02T09:13:33Z<p>M0KHZ: </p>
<hr />
<div>'''<br />
''' Hermes - A DUC/DDC Transceiver '''<br />
<br />
[[Image:Hardware_Block_Diagram_V1_5.jpg|thumb|500px|Hardware block diagram. Click to enlarge.]]<br />
Project Leader: Kevin M0KHZ<br />
<br />
Following the outstanding success of [[MERCURY|Mercury]] and [[PENELOPE|Penelope]], and while investigating the verilog code for both, I had the insane idea of merging the verilog code of Mercury and Penelope into a single fpga! I played around with this idea for a while and the more I thought about it the more I liked the idea. <br />
<br />
So here is '''<u>the proposal</u>''', '''to develop a single board HPSDR based on the hardware of Mercury and Penelope and a single large fpga.'''<br />
<br />
This board would have PC connectivity by USB. I’m planning to squeeze this all onto Euro Card sized PCB (100 x 160 mm), and if I utilize both sides I might even have room for a [[PENNYWHISTLE|Pennywhistle]] type PA :). <br />
<br />
Basic specs so far (nothing cast in stone)<br />
<br />
*Fpga EP3C25Q240C or EP3C40Q240 (I think this is the largest without BGA pin out)<br />
*Mercury receive chain<br />
*Penelope transmit chain, possible small change to gain distribution<br />
*USB2 to PC data transfer<br />
*Pennywhistle PA (if there’s room)<br />
*10Mhz ext an option<br />
*Alex filter switching header<br />
*2.8W stereo audio PA<br />
*13.5V supply<br />
<br />
Following the tradition of the HPSDR naming convention, I thought Hermes was appropriate as he was known for his invention and theft!<br />
[[Image:P1010663.JPG|thumb|300px|The enclosure I intend to use for the prototype, the euro card will slide in, regulators and PA transistors will be bolted directly to the case and there is plenty of room for additional hardware (LPF's, Beagleboard??? - who knows :))]]<br />
Current status ( 20 April 09 ), Project proposal [[HERMES - Design Discussions|open for comment]]. Looking to nail ‘major’ hardware decisions by the end of the month. Initial draft schematics will then be produced and placed here on the Wiki for comment.<br />
<br />
Update (13 September 09) the initial schematics have been created and can be found here : [[Media:Hermes_RevA5-3.pdf|Hermes_RevA5-3.pdf]]<br />
<br />
Update (27 September 09) following comments regarding the initial schematics, the design has now been frozen for Alpha board development, thank you to all who have contributed, through an HPSDR community effort, Hermes is one step closer to becoming a reality. The updated schematics can be found here :<br />
[[Media:Hermes_RevA7-3.pdf|Hermes_RevA7-3.pdf]]<br />
<br />
Update (9 October 09) Just to wet your appetite, here are the current top & bottom layout details for Hermes.<br />
<br />
[[Media:Hermes_top.pdf|Hermes_top.pdf]]<br />
<br />
[[Media:Hermes_bottom.pdf|Hermes_bottom.pdf]]<br />
<br />
Although not quite finished you can gain an appreciation of the beautiful and artful skills from Tony.<br />
He is doing a fantastic job laying out the 6 layers needed to bring Hermes alive, current plans are to finalise the layout this weekend, shortly followed by an order for the Alpha PCB’s.<br />
<br />
Update (14 October 09) I've uploaded the Alpha PCB foils, costings are being sort and we are planning to order the Alpha boards in the very near future.<br />
<br />
[[Media:Bottom.pdf|Bottom.pdf]]<br />
<br />
[[Media:VCC.pdf|VCC.pdf]]<br />
<br />
[[Media:L4.pdf|L4.pdf]]<br />
<br />
[[Media:L3.pdf|L3.pdf]]<br />
<br />
[[Media:GND.pdf|GND.pdf]]<br />
<br />
[[Media:Top Layer.pdf|Top Layer.pdf]]<br />
<br />
[[Media:SilkScreen Bottom.pdf|Silkscreen Bottom.pdf]]<br />
<br />
[[Media:SilkScreen Top.pdf|Silkscreen Top.pdf]]<br />
<br />
Update (2 November 09) The Alpha PCB's have just been released from the manufacture and are currently in transit to Bill for kitting, pictures can be found here:<br />
<br />
[[Media:DSC00142.jpg|DSC00142.jpg]]<br />
<br />
[[Media:DSC00143.jpg|DSC00143.jpg]]<br />
<br />
Tony has started populating the first board, supplies and FX2 all correct and working, he is now building up the receive chain in preparation for some initial test code Phil is in the process of developing.<br />
<br />
Further updates to follow shortly.<br />
<br />
<br />
<br />
[[Apollo]] is a combined 15w PA and Low Pass Filter bank. The Apollo project is led by Kjell Karlsen LA2NI .<br />
<br />
''' Please see [[HERMES - Design Discussions]]'''</div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=File:DSC00143.jpg&diff=2505File:DSC00143.jpg2009-11-02T09:13:11Z<p>M0KHZ: </p>
<hr />
<div></div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=File:DSC00142.jpg&diff=2504File:DSC00142.jpg2009-11-02T09:12:32Z<p>M0KHZ: </p>
<hr />
<div></div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=File:DSC00143.JPG&diff=2503File:DSC00143.JPG2009-11-02T09:03:54Z<p>M0KHZ: </p>
<hr />
<div></div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=File:DSC00142.JPG&diff=2502File:DSC00142.JPG2009-11-02T09:03:25Z<p>M0KHZ: </p>
<hr />
<div></div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=HERMES&diff=2383HERMES2009-10-14T18:24:18Z<p>M0KHZ: </p>
<hr />
<div>'''<br />
''' Hermes - A DUC/DDC Transceiver '''<br />
<br />
[[Image:Hardware_Block_Diagram_V1_5.jpg|thumb|500px|Hardware block diagram. Click to enlarge.]]<br />
Project Leader: Kevin M0KHZ<br />
<br />
Following the outstanding success of [[MERCURY|Mercury]] and [[PENELOPE|Penelope]], and while investigating the verilog code for both, I had the insane idea of merging the verilog code of Mercury and Penelope into a single fpga! I played around with this idea for a while and the more I thought about it the more I liked the idea. <br />
<br />
So here is '''<u>the proposal</u>''', '''to develop a single board HPSDR based on the hardware of Mercury and Penelope and a single large fpga.'''<br />
<br />
This board would have PC connectivity by USB. I’m planning to squeeze this all onto Euro Card sized PCB (100 x 160 mm), and if I utilize both sides I might even have room for a [[PENNYWHISTLE|Pennywhistle]] type PA :). <br />
<br />
Basic specs so far (nothing cast in stone)<br />
<br />
*Fpga EP3C25Q240C or EP3C40Q240 (I think this is the largest without BGA pin out)<br />
*Mercury receive chain<br />
*Penelope transmit chain, possible small change to gain distribution<br />
*USB2 to PC data transfer<br />
*Pennywhistle PA (if there’s room)<br />
*10Mhz ext an option<br />
*Alex filter switching header<br />
*2.8W stereo audio PA<br />
*13.5V supply<br />
<br />
Following the tradition of the HPSDR naming convention, I thought Hermes was appropriate as he was known for his invention and theft!<br />
[[Image:P1010663.JPG|thumb|300px|The enclosure I intend to use for the prototype, the euro card will slide in, regulators and PA transistors will be bolted directly to the case and there is plenty of room for additional hardware (LPF's, Beagleboard??? - who knows :))]]<br />
Current status ( 20 April 09 ), Project proposal [[HERMES - Design Discussions|open for comment]]. Looking to nail ‘major’ hardware decisions by the end of the month. Initial draft schematics will then be produced and placed here on the Wiki for comment.<br />
<br />
Update (13 September 09) the initial schematics have been created and can be found here : [[Media:Hermes_RevA5-3.pdf|Hermes_RevA5-3.pdf]]<br />
<br />
Update (27 September 09) following comments regarding the initial schematics, the design has now been frozen for Alpha board development, thank you to all who have contributed, through an HPSDR community effort, Hermes is one step closer to becoming a reality. The updated schematics can be found here :<br />
[[Media:Hermes_RevA7-3.pdf|Hermes_RevA7-3.pdf]]<br />
<br />
Update (9 October 09) Just to wet your appetite, here are the current top & bottom layout details for Hermes.<br />
<br />
[[Media:Hermes_top.pdf|Hermes_top.pdf]]<br />
<br />
[[Media:Hermes_bottom.pdf|Hermes_bottom.pdf]]<br />
<br />
Although not quite finished you can gain an appreciation of the beautiful and artful skills from Tony.<br />
He is doing a fantastic job laying out the 6 layers needed to bring Hermes alive, current plans are to finalise the layout this weekend, shortly followed by an order for the Alpha PCB’s.<br />
<br />
Update (14 October 09) I've uploaded the Alpha PCB foils, costings are being sort and we are planning to order the Alpha boards in the very near future.<br />
<br />
[[Media:Bottom.pdf|Bottom.pdf]]<br />
<br />
[[Media:VCC.pdf|VCC.pdf]]<br />
<br />
[[Media:L4.pdf|L4.pdf]]<br />
<br />
[[Media:L3.pdf|L3.pdf]]<br />
<br />
[[Media:GND.pdf|GND.pdf]]<br />
<br />
[[Media:Top Layer.pdf|Top Layer.pdf]]<br />
<br />
[[Media:SilkScreen Bottom.pdf|Silkscreen Bottom.pdf]]<br />
<br />
[[Media:SilkScreen Top.pdf|Silkscreen Top.pdf]]<br />
<br />
Further update soon :)<br />
<br />
<br />
<br />
[[Apollo]] is a combined 15w PA and Low Pass Filter bank. The Apollo project is led by Kjell Karlsen LA2NI .<br />
<br />
''' Please see [[HERMES - Design Discussions]]'''</div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=HERMES&diff=2382HERMES2009-10-14T18:23:13Z<p>M0KHZ: </p>
<hr />
<div>'''<br />
''' Hermes - A DUC/DDC Transceiver '''<br />
<br />
[[Image:Hardware_Block_Diagram_V1_5.jpg|thumb|500px|Hardware block diagram. Click to enlarge.]]<br />
Project Leader: Kevin M0KHZ<br />
<br />
Following the outstanding success of [[MERCURY|Mercury]] and [[PENELOPE|Penelope]], and while investigating the verilog code for both, I had the insane idea of merging the verilog code of Mercury and Penelope into a single fpga! I played around with this idea for a while and the more I thought about it the more I liked the idea. <br />
<br />
So here is '''<u>the proposal</u>''', '''to develop a single board HPSDR based on the hardware of Mercury and Penelope and a single large fpga.'''<br />
<br />
This board would have PC connectivity by USB. I’m planning to squeeze this all onto Euro Card sized PCB (100 x 160 mm), and if I utilize both sides I might even have room for a [[PENNYWHISTLE|Pennywhistle]] type PA :). <br />
<br />
Basic specs so far (nothing cast in stone)<br />
<br />
*Fpga EP3C25Q240C or EP3C40Q240 (I think this is the largest without BGA pin out)<br />
*Mercury receive chain<br />
*Penelope transmit chain, possible small change to gain distribution<br />
*USB2 to PC data transfer<br />
*Pennywhistle PA (if there’s room)<br />
*10Mhz ext an option<br />
*Alex filter switching header<br />
*2.8W stereo audio PA<br />
*13.5V supply<br />
<br />
Following the tradition of the HPSDR naming convention, I thought Hermes was appropriate as he was known for his invention and theft!<br />
[[Image:P1010663.JPG|thumb|300px|The enclosure I intend to use for the prototype, the euro card will slide in, regulators and PA transistors will be bolted directly to the case and there is plenty of room for additional hardware (LPF's, Beagleboard??? - who knows :))]]<br />
Current status ( 20 April 09 ), Project proposal [[HERMES - Design Discussions|open for comment]]. Looking to nail ‘major’ hardware decisions by the end of the month. Initial draft schematics will then be produced and placed here on the Wiki for comment.<br />
<br />
Update (13 September 09) the initial schematics have been created and can be found here : [[Media:Hermes_RevA5-3.pdf|Hermes_RevA5-3.pdf]]<br />
<br />
Update (27 September 09) following comments regarding the initial schematics, the design has now been frozen for Alpha board development, thank you to all who have contributed, through an HPSDR community effort, Hermes is one step closer to becoming a reality. The updated schematics can be found here :<br />
[[Media:Hermes_RevA7-3.pdf|Hermes_RevA7-3.pdf]]<br />
<br />
Update (9 October 09) Just to wet your appetite, here are the current top & bottom layout details for Hermes.<br />
<br />
[[Media:Hermes_top.pdf|Hermes_top.pdf]]<br />
<br />
[[Media:Hermes_bottom.pdf|Hermes_bottom.pdf]]<br />
<br />
Although not quite finished you can gain an appreciation of the beautiful and artful skills from Tony.<br />
He is doing a fantastic job laying out the 6 layers needed to bring Hermes alive, current plans are to finalise the layout this weekend, shortly followed by an order for the Alpha PCB’s.<br />
<br />
Update (14 October 09) I've uploaded the Alpha PCB foils, costing are being sort and we are planning to order the Alpha boards in the very near future.<br />
<br />
[[Media:Bottom.pdf|Bottom.pdf]]<br />
<br />
[[Media:VCC.pdf|VCC.pdf]]<br />
<br />
[[Media:L4.pdf|L4.pdf]]<br />
<br />
[[Media:L3.pdf|L3.pdf]]<br />
<br />
[[Media:GND.pdf|GND.pdf]]<br />
<br />
[[Media:Top Layer.pdf|Top Layer.pdf]]<br />
<br />
[[Media:SilkScreen Bottom.pdf|Silkscreen Bottom.pdf]]<br />
<br />
[[Media:SilkScreen Top.pdf|Silkscreen Top.pdf]]<br />
<br />
Further update soon :)<br />
<br />
<br />
<br />
[[Apollo]] is a combined 15w PA and Low Pass Filter bank. The Apollo project is led by Kjell Karlsen LA2NI .<br />
<br />
''' Please see [[HERMES - Design Discussions]]'''</div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=HERMES&diff=2381HERMES2009-10-14T18:18:09Z<p>M0KHZ: </p>
<hr />
<div>'''<br />
''' Hermes - A DUC/DDC Transceiver '''<br />
<br />
[[Image:Hardware_Block_Diagram_V1_5.jpg|thumb|500px|Hardware block diagram. Click to enlarge.]]<br />
Project Leader: Kevin M0KHZ<br />
<br />
Following the outstanding success of [[MERCURY|Mercury]] and [[PENELOPE|Penelope]], and while investigating the verilog code for both, I had the insane idea of merging the verilog code of Mercury and Penelope into a single fpga! I played around with this idea for a while and the more I thought about it the more I liked the idea. <br />
<br />
So here is '''<u>the proposal</u>''', '''to develop a single board HPSDR based on the hardware of Mercury and Penelope and a single large fpga.'''<br />
<br />
This board would have PC connectivity by USB. I’m planning to squeeze this all onto Euro Card sized PCB (100 x 160 mm), and if I utilize both sides I might even have room for a [[PENNYWHISTLE|Pennywhistle]] type PA :). <br />
<br />
Basic specs so far (nothing cast in stone)<br />
<br />
*Fpga EP3C25Q240C or EP3C40Q240 (I think this is the largest without BGA pin out)<br />
*Mercury receive chain<br />
*Penelope transmit chain, possible small change to gain distribution<br />
*USB2 to PC data transfer<br />
*Pennywhistle PA (if there’s room)<br />
*10Mhz ext an option<br />
*Alex filter switching header<br />
*2.8W stereo audio PA<br />
*13.5V supply<br />
<br />
Following the tradition of the HPSDR naming convention, I thought Hermes was appropriate as he was known for his invention and theft!<br />
[[Image:P1010663.JPG|thumb|300px|The enclosure I intend to use for the prototype, the euro card will slide in, regulators and PA transistors will be bolted directly to the case and there is plenty of room for additional hardware (LPF's, Beagleboard??? - who knows :))]]<br />
Current status ( 20 April 09 ), Project proposal [[HERMES - Design Discussions|open for comment]]. Looking to nail ‘major’ hardware decisions by the end of the month. Initial draft schematics will then be produced and placed here on the Wiki for comment.<br />
<br />
Update (13 September 09) the initial schematics have been created and can be found here : [[Media:Hermes_RevA5-3.pdf|Hermes_RevA5-3.pdf]]<br />
<br />
Update (27 September 09) following comments regarding the initial schematics, the design has now been frozen for Alpha board development, thank you to all who have contributed, through an HPSDR community effort, Hermes is one step closer to becoming a reality. The updated schematics can be found here :<br />
[[Media:Hermes_RevA7-3.pdf|Hermes_RevA7-3.pdf]]<br />
<br />
Update (9 October 09) Just to wet your appetite, here are the current top & bottom layout details for Hermes.<br />
<br />
[[Media:Hermes_top.pdf|Hermes_top.pdf]]<br />
<br />
[[Media:Hermes_bottom.pdf|Hermes_bottom.pdf]]<br />
<br />
Although not quite finished you can gain an appreciation of the beautiful and artful skills from Tony.<br />
He is doing a fantastic job laying out the 6 layers needed to bring Hermes alive, current plans are to finalise the layout this weekend, shortly followed by an order for the Alpha PCB’s.<br />
<br />
Update (14 October 09) I've uploaded the Alpha PCB foils, costing are being sort and we are planning to order the Alpha boards in the very near future.<br />
<br />
[[Media:Bottom.pdf|Bottom.pdf]]<br />
<br />
[[Media:VCC.pdf|VCC.pdf]]<br />
<br />
[[Media:L4.pdf|L4.pdf]]<br />
<br />
[[Media:L3.pdf|L3.pdf]]<br />
<br />
<br />
<br />
<br />
[[Apollo]] is a combined 15w PA and Low Pass Filter bank. The Apollo project is led by Kjell Karlsen LA2NI .<br />
<br />
''' Please see [[HERMES - Design Discussions]]'''</div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=File:Vcc.pdf&diff=2380File:Vcc.pdf2009-10-14T18:12:26Z<p>M0KHZ: </p>
<hr />
<div></div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=File:SilkScreen_Top.pdf&diff=2379File:SilkScreen Top.pdf2009-10-14T17:58:27Z<p>M0KHZ: </p>
<hr />
<div></div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=File:SilkScreen_Bottom.pdf&diff=2378File:SilkScreen Bottom.pdf2009-10-14T17:58:08Z<p>M0KHZ: </p>
<hr />
<div></div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=File:Top_Layer.pdf&diff=2377File:Top Layer.pdf2009-10-14T17:57:52Z<p>M0KHZ: </p>
<hr />
<div></div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=File:GND.pdf&diff=2376File:GND.pdf2009-10-14T17:57:34Z<p>M0KHZ: </p>
<hr />
<div></div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=File:L3.pdf&diff=2375File:L3.pdf2009-10-14T17:57:12Z<p>M0KHZ: </p>
<hr />
<div></div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=File:L4.pdf&diff=2374File:L4.pdf2009-10-14T17:56:55Z<p>M0KHZ: </p>
<hr />
<div></div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=File:VCC.pdf&diff=2373File:VCC.pdf2009-10-14T17:56:37Z<p>M0KHZ: </p>
<hr />
<div></div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=File:Bottom.pdf&diff=2372File:Bottom.pdf2009-10-14T17:56:11Z<p>M0KHZ: </p>
<hr />
<div></div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=HERMES&diff=2303HERMES2009-10-09T17:57:12Z<p>M0KHZ: </p>
<hr />
<div>'''<br />
''' Hermes - A DUC/DDC Transceiver '''<br />
<br />
[[Image:Hardware_Block_Diagram_V1_5.jpg|thumb|500px|Hardware block diagram. Click to enlarge.]]<br />
Project Leader: Kevin M0KHZ<br />
<br />
Following the outstanding success of [[MERCURY|Mercury]] and [[PENELOPE|Penelope]], and while investigating the verilog code for both, I had the insane idea of merging the verilog code of Mercury and Penelope into a single fpga! I played around with this idea for a while and the more I thought about it the more I liked the idea. <br />
<br />
So here is '''<u>the proposal</u>''', '''to develop a single board HPSDR based on the hardware of Mercury and Penelope and a single large fpga.'''<br />
<br />
This board would have PC connectivity by USB. I’m planning to squeeze this all onto Euro Card sized PCB (100 x 160 mm), and if I utilize both sides I might even have room for a [[PENNYWHISTLE|Pennywhistle]] type PA :). <br />
<br />
Basic specs so far (nothing cast in stone)<br />
<br />
*Fpga EP3C25Q240C or EP3C40Q240 (I think this is the largest without BGA pin out)<br />
*Mercury receive chain<br />
*Penelope transmit chain, possible small change to gain distribution<br />
*USB2 to PC data transfer<br />
*Pennywhistle PA (if there’s room)<br />
*10Mhz ext an option<br />
*Alex filter switching header<br />
*2.8W stereo audio PA<br />
*13.5V supply<br />
<br />
Following the tradition of the HPSDR naming convention, I thought Hermes was appropriate as he was known for his invention and theft!<br />
[[Image:P1010663.JPG|thumb|300px|The enclosure I intend to use for the prototype, the euro card will slide in, regulators and PA transistors will be bolted directly to the case and there is plenty of room for additional hardware (LPF's, Beagleboard??? - who knows :))]]<br />
Current status ( 20 April 09 ), Project proposal [[HERMES - Design Discussions|open for comment]]. Looking to nail ‘major’ hardware decisions by the end of the month. Initial draft schematics will then be produced and placed here on the Wiki for comment.<br />
<br />
Update (13 September 09) the initial schematics have been created and can be found here : [[Media:Hermes_RevA5-3.pdf|Hermes_RevA5-3.pdf]]<br />
<br />
Update (27 September 09) following comments regarding the initial schematics, the design has now been frozen for Alpha board development, thank you to all who have contributed, through an HPSDR community effort, Hermes is one step closer to becoming a reality. The updated schematics can be found here :<br />
[[Media:Hermes_RevA7-3.pdf|Hermes_RevA7-3.pdf]]<br />
<br />
Update (9 October 09) Just to wet your appetite, here are the current top & bottom layout details for Hermes.<br />
<br />
[[Media:Hermes_top.pdf|Hermes_top.pdf]]<br />
<br />
[[Media:Hermes_bottom.pdf|Hermes_bottom.pdf]]<br />
<br />
Although not quite finished you can gain an appreciation of the beautiful and artful skills from Tony.<br />
He is doing a fantastic job laying out the 6 layers needed to bring Hermes alive, current plans are to finalise the layout this weekend, shortly followed by an order for the Alpha PCB’s.<br />
<br />
<br />
[[Apollo]] is a combined 15w PA and Low Pass Filter bank. The Apollo project is led by Kjell Karlsen LA2NI .<br />
<br />
''' Please see [[HERMES - Design Discussions]]'''</div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=File:Hermes_bottom.pdf&diff=2302File:Hermes bottom.pdf2009-10-09T17:51:46Z<p>M0KHZ: </p>
<hr />
<div></div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=File:Hermes_top.pdf&diff=2301File:Hermes top.pdf2009-10-09T17:51:19Z<p>M0KHZ: </p>
<hr />
<div></div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=File:Hermes_RevA7-3.pdf&diff=2166File:Hermes RevA7-3.pdf2009-09-27T12:15:49Z<p>M0KHZ: </p>
<hr />
<div></div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=HERMES&diff=2165HERMES2009-09-27T12:14:45Z<p>M0KHZ: </p>
<hr />
<div>'''<br />
''' Hermes - A DUC/DDC Transceiver '''<br />
<br />
[[Image:Hardware_Block_Diagram_V1_5.jpg|thumb|500px|Hardware block diagram. Click to enlarge.]]<br />
Project Leader: Kevin M0KHZ<br />
<br />
Following the outstanding success of [[MERCURY|Mercury]] and [[PENELOPE|Penelope]], and while investigating the verilog code for both, I had the insane idea of merging the verilog code of Mercury and Penelope into a single fpga! I played around with this idea for a while and the more I thought about it the more I liked the idea. <br />
<br />
So here is '''<u>the proposal</u>''', '''to develop a single board HPSDR based on the hardware of Mercury and Penelope and a single large fpga.'''<br />
<br />
This board would have PC connectivity by USB. I’m planning to squeeze this all onto Euro Card sized PCB (100 x 160 mm), and if I utilize both sides I might even have room for a [[PENNYWHISTLE|Pennywhistle]] type PA :). <br />
<br />
Basic specs so far (nothing cast in stone)<br />
<br />
*Fpga EP3C25Q240C or EP3C40Q240 (I think this is the largest without BGA pin out)<br />
*Mercury receive chain<br />
*Penelope transmit chain, possible small change to gain distribution<br />
*USB2 to PC data transfer<br />
*Pennywhistle PA (if there’s room)<br />
*10Mhz ext an option<br />
*Alex filter switching header<br />
*2.8W stereo audio PA<br />
*13.5V supply<br />
<br />
Following the tradition of the HPSDR naming convention, I thought Hermes was appropriate as he was known for his invention and theft!<br />
[[Image:P1010663.JPG|thumb|300px|The enclosure I intend to use for the prototype, the euro card will slide in, regulators and PA transistors will be bolted directly to the case and there is plenty of room for additional hardware (LPF's, Beagleboard??? - who knows :))]]<br />
Current status ( 20 April 09 ), Project proposal [[HERMES - Design Discussions|open for comment]]. Looking to nail ‘major’ hardware decisions by the end of the month. Initial draft schematics will then be produced and placed here on the Wiki for comment.<br />
<br />
Update (13 September 09) the initial schematics have been created and can be found here : [[Media:Hermes_RevA5-3.pdf|Hermes_RevA5-3.pdf]]<br />
<br />
Update (27 September 09) following comments regarding the initial schematics, the design has now been frozen for Alpha board development, thank you to all who have contributed, through an HPSDR community effort, Hermes is one step closer to becoming a reality. The updated schematics can be found here :<br />
[[Media:Hermes_RevA7-3.pdf|Hermes_RevA7-3.pdf]]<br />
<br />
[[Apollo]] is a combined 15w PA and Low Pass Filter bank. The Apollo project is led by Kjell Karlsen LA2NI .<br />
<br />
''' Please see [[HERMES - Design Discussions]]'''</div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=File:Hermes_reva7-3.pdf&diff=2164File:Hermes reva7-3.pdf2009-09-27T12:04:15Z<p>M0KHZ: </p>
<hr />
<div></div>M0KHZhttp://openhpsdr.org/wiki/index.php?title=HERMES&diff=2095HERMES2009-09-13T07:50:21Z<p>M0KHZ: </p>
<hr />
<div>'''<br />
''' Hermes - A DUC/DDC Transceiver '''<br />
<br />
[[Image:Hardware_Block_Diagram_V1_5.jpg|thumb|500px|Hardware block diagram. Click to enlarge.]]<br />
Project Leader: Kevin M0KHZ<br />
<br />
Following the outstanding success of [[MERCURY|Mercury]] and [[PENELOPE|Penelope]], and while investigating the verilog code for both, I had the insane idea of merging the verilog code of Mercury and Penelope into a single fpga! I played around with this idea for a while and the more I thought about it the more I liked the idea. <br />
<br />
So here is '''<u>the proposal</u>''', '''to develop a single board HPSDR based on the hardware of Mercury and Penelope and a single large fpga.'''<br />
<br />
This board would have PC connectivity by USB. I’m planning to squeeze this all onto Euro Card sized PCB (100 x 160 mm), and if I utilize both sides I might even have room for a [[PENNYWHISTLE|Pennywhistle]] type PA :). <br />
<br />
Basic specs so far (nothing cast in stone)<br />
<br />
*Fpga EP3C25Q240C or EP3C40Q240 (I think this is the largest without BGA pin out)<br />
*Mercury receive chain<br />
*Penelope transmit chain, possible small change to gain distribution<br />
*USB2 to PC data transfer<br />
*Pennywhistle PA (if there’s room)<br />
*10Mhz ext an option<br />
*Alex filter switching header<br />
*2.8W stereo audio PA<br />
*13.5V supply<br />
<br />
Following the tradition of the HPSDR naming convention, I thought Hermes was appropriate as he was known for his invention and theft!<br />
[[Image:P1010663.JPG|thumb|300px|The enclosure I intend to use for the prototype, the euro card will slide in, regulators and PA transistors will be bolted directly to the case and there is plenty of room for additional hardware (LPF's, Beagleboard??? - who knows :))]]<br />
Current status ( 20 April 09 ), Project proposal [[HERMES - Design Discussions|open for comment]]. Looking to nail ‘major’ hardware decisions by the end of the month. Initial draft schematics will then be produced and placed here on the Wiki for comment.<br />
<br />
Update (13 September 09 ) the initial schematics have been created and can be found here : [[Image:Hermes_RevA5-3.pdf]]<br />
<br />
[[Apollo]] is a combined 15w PA and Low Pass Filter bank. The Apollo project is led by Kjell Karlsen LA2NI .<br />
<br />
''' Please see [[HERMES - Design Discussions]]'''</div>M0KHZ