View source for Apollo - Development Discussion

[[Image:Apollo_Schematic_rev_1A-1.jpg|thumb|400px|Rev 1A, page 1, of the Apollo schematic. Click for larger images.]]
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]
[[Image:Apollo_Schematic_rev_1A-2.jpg|thumb|400px|Rev 1A, page 2, of the Apollo schematic. Click for larger images.]]

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Update 18 December 2009, here is a high resolution picture of Kjell's alpha Apollo board, looking very good :)

: [[media:Apollo_PCB_003.jpg|High Res Alpha.jpg]].

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Update 16 December 2009, the latest schematics can be found here : [[media:Apollo151209.pdf|PDF Rev 1D Schematic]].


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* The New PDF version of the schematic is here: [[media:Apollo_Schematic_rev_1A.pdf|PDF Rev 1A Schematic]].

* The Silkscreen Top here: [[media:Apollo_silk_top.pdf|Silkscreen Top, Rev 1A]].

* The Silkscreen Bottom is here: [[media:ApolloSilkBottom.pdf|Silkscreen Bottom, Rev 1A]].

* The PCB Top here: [[media:ApolloPCBTop.pdf|PCB Top, Rev 1A]].

* The PCB Bottom is here: [[media:ApolloPCBBottom.pdf|PCB Bottom, Rev 1A]].

Added for '''LA2NI, Kjell''' by -- [[User:KV0S|KV0S, Dave]] 16:38, 10 October 2009 (UTC)


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The original PDF version of the schematic is here: [[media:Apollo_rev_0.pdf|PDF rev 0 Schematic]].

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Three comments:
#I believe the interface is SPI rather than I2C for the TPIC595 latches.
#74HC14 can be used in lieu of 74HC04.  The '14 has Schmitt trigger inputs, might help with noise immunity on the control line(s).
#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)
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: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)

[[Category:Apollo]]