[amsat-bb] Re: AO-40 Replacement

John Stephensen kd6ozh at comcast.net
Wed Sep 4 19:24:37 PDT 2013

The satellite could collect the individual uplink signals and package them 
in one downlink. One TDM downlink would use much less power than FDM 
downlinks and would fit in the bandwidth of existing amateur receivers. Once 
you have DSP in the satellite, there are a lot of possibilities.



----- Original Message ----- 
From: "Virgil Bierschwale" <vbiersch at gmail.com>
To: "'John Stephensen'" <kd6ozh at comcast.net>; "'Clint Bradford'" 
<clintbrad4d at earthlink.net>; <amsat-bb at amsat.org>
Sent: Thursday, September 05, 2013 01:52 UTC
Subject: RE: [amsat-bb] Re: AO-40 Replacement

> I've enjoyed reading this segment and I wasn't going to touch it, but this
> one makes me want to chip in my two cents.
> Granted, I'm not up to speed on what ya'll have done or what you haven't
> done.
> But we used to use a ucc1 in the navy to receive messages.
> http://www.virhistory.com/navy/rtty-mux-ucc1.htm
> It would allow us to receive something like 16 or 32 separate traffic
> channels on one frequency.
> Wouldn't it be possible to develop something like that in satellite
> communications?
> I ask because if you were to do it, you could substantially increase the
> amount of channels that you could process?
> Virgil
> -----Original Message-----
> From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
> Behalf Of John Stephensen
> Sent: Wednesday, September 04, 2013 8:31 PM
> To: Clint Bradford; amsat-bb at amsat.org
> Subject: [amsat-bb] Re: AO-40 Replacement
> If we want the most "bang for the buck", it would be something that 
> supports
> the most QSOs per watt of solar power. Since most hams have computers,
> something that supports half a dozen PSK31 sessions would suffice. Given 
> the
> new open-source voice codec you could also make something that supports
> multiple digital voice QSOs with less power than now required for analog 
> FM
> or SSB.
> 73,
> John
> ----- Original Message -----
> From: "Clint Bradford" <clintbrad4d at earthlink.net>
> To: <amsat-bb at amsat.org>; <amsat-bb at amsat.org>
> Sent: Thursday, September 05, 2013 00:27 UTC
> Subject: [amsat-bb] Re: AO-40 Replacement
>>>> ... launch opportunities are so rare that we ought to
>> fly the most capable equipment we can on those rare
>> occasions when we can get a launch ...
>> Perhaps we should define, "most capable equipment." And
>> we also need to define "bang for the buck."
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