[amsat-bb] Re: HF satellite?

[n3tl@bellsouth.net]

I think it's a great idea. I suspect there will, indeed, be some Doppler challenges.

Although, I wonder.... How would Doppler's impact on PSK-31 be different from, say, SSTV? I ask because the SSTV schedules on AO-51 have been pleasantly surprising to me, in terms of the quality of image I was getting. 

73 to all,

Tim
-------------- Original message from "Robert Bruninga" <bruninga at usna.edu>: -------------- 


> We are considering an HF transponder for our next long range 
> CUBESAT mission planning. It can have three modes: 
> 
> 1) APRS 1200 baud for command and control and APRS on 145.825 
> 2) PSK-31 multi-user SSB uplink on 29 MHz and FM down link on 
> 145.825 
> 3) 29 MHz uplink and 24 MHz downlink SSB transponder 
> 
> We will welcome someone in the AMSAT community that wants to 
> contribute to mission 3, the HF transponder. We tried the #2 
> PSK-31 mission on PCSAT2 and RAFT, both failed due to HF antenna 
> deployment problems. Now we are going to try again... 
> 
> Bob, WB4APR 
> 
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