Difference between revisions of "Apollo - Development Discussion"

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October 10, 2009
 
October 10, 2009
  
The New PDF version of the schematic is here: [[image:Apollo_Schematic_Rev_1A.pdf|PDF rev 1A Schematic]].
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The New PDF version of the schematic is here: [[image:Apollo_Schematic_rev_1A.pdf|PDF rev 1A Schematic]].
  
  

Revision as of 09:25, 10 October 2009

Rev 0 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 hpsdr@lists.openhpsdr.org or direct email to Kjell Karlsen

October 10, 2009

The New PDF version of the schematic is here: File:Apollo Schematic rev 1A.pdf.



The original PDF version of the schematic is here: PDF rev 0 Schematic.


Three comments:

  1. I believe the interface is SPI rather than I2C for the TPIC595 latches.
  2. 74HC14 can be used in lieu of 74HC04. The '14 has Schmitt trigger inputs, might help with noise immunity on the control line(s).
  3. 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 :-). KK7P 21:22, 14 June 2009 (UTC)

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. KK7P 05:02 31 July 2009 (UTC)