[amsat-bb] PSAT2 PSK31

[Brian Wilkins KO4AQF]

All

We have been able to successfully send via PSAT2 on multiple occasions and
QTHs PSK31 via PSAT2. However we have not been able to attain the holy
grail of having the transponder also transmit our SSTV signals at the same
time. Our experiments have involved multiple parties spread across a large
geographical distance with mutual FPs, antenna types and power levels to no
avail. Any helps or tips would be greatly appreciated. Tonight we decoded
PSK31 from KK4YEL who was sending thru a vertical antenna as it passed
overhead with N8URE attempting to send SSTV at the same time. On other
occasions we have decided PSK31 from N8URE who is sending at only 5W. In
all cases we have been using DopplerPSK.

On Fri, Oct 30, 2020 at 9:41 PM Stephen DeVience via AMSAT-BB <
amsat-bb at amsat.org> wrote:

> Today I was able to get a PSK signal through PSAT2, and it was recorded by
> KO4AQF in FL. I sent with a dial frequency of 29.4815 MHz and an audio
> frequency of 1000 Hz using DopplerPSK. It was detected at ~2650 Hz, which
> means the appropriate dial frequency to use is actually about 29.479 MHz.
> This agrees with the Brno team's website, where they say "The main function
> of the transponder is to receive PSK signals from 29.48 MHz uplink
> (passband from 29.4804 to 29.4826 MHz)."
>
> I also measured the downlink to be about 3.6 kHz higher than 435.350 MHz.
>
> -Stephen
> N8URE
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-- 
Brian Wilkins
KO4AQF