[hpsdr] SDX Design, HORTON, CASMIR, and GIBRALTAR

[Robert McGwier]

Alex:

Eaglepedia will be open soon.  The 70cm is in prototype stage and we 
have a well known designer doing this KD6OZH who did the an earlier FPGA 
SDR design using Xilinx parts.  It is my experience with that project 
that lets me know we are going to have to have someone put on these 
small pitch parts.  So far as I know of a couple of  people (including 
me) succeeded in getting the thing together.  It pays to have a $500 
microscope.  John will do the 23cm receiver next.

The phasing is for several different projects.  For our digital 
transponder experiment (N8VB, AB2KT, KK7P, N2MJI, K7GNU, W2GPS, K3IO, 
KD6OZH,   [SDR, GnuRadio, etc. users all], others participating), we are 
attempting a phased array on C band.  I am just .  Expect to see lots of 
HPSDR fall out in orbit ;-).

Bob



Alex wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Lyle,
> Looking some more at the P3E SDX block diagram. Are flight test L & U band receivers are existing and are being exhibited at Dayton? Or is the hardware still at prototyping stage? Is the design for the receivers available? It might give HORTON design a boost. 
>
> The reason behind my asing is this quote fromm the AMSAT-NA website ...
> "A working Software Defined Transponder(SDX) on 2M and 70cm, like the one to be used on our EAGLE satellite will be on display."
>
>
> What if GIBRALTAR placed a 10MHz signal onto ATLAS, and then MERCURY, HORTON, and CASMIR could use it as a reference signal as a basis for whatever local osc frequency was required. For Bob's phasing idea, there could be a separate LO bus shared between multiple CASMIRs. I worry that we might be introducing too much noise into the system if we try to ship a VHF/UHF LO onto ATLAS.
>
> Alex, N3NP
>
>
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-- 
AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats,
NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman
Laziness is the number one inspiration for ingenuity.  Guilty as charged!


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