[amsat-bb] HF Satellite Transponder
glasbrenner at mindspring.com
Thu May 26 18:07:56 UTC 2016
Paul makes good points on using 15 instead of 12. RS-12/13 ran primarily in
Mode K, 15 up and 10 down, with I think a 40 Khz transponder. It was my
first satellite, and many others I'm sure. Doppler is really low, easy to
work half duplex with a fan dipole and a single HF rig. With the upcoming
solar minimum, I think it'd be a popular transponder (again) if available
for voice as well as CW/data.
Separate email to follow direct on a possibly interested builder.
73, Drew KO4MA
From: AMSAT-BB [mailto:amsat-bb-bounces at amsat.org] On Behalf Of Paul
Sent: Thursday, May 26, 2016 1:50 PM
To: Robert Bruninga
Cc: amsat bb
Subject: Re: [amsat-bb] HF Satellite Transponder
A 15 to 10 Mode K satellite would be fun. 12 meters is allocated to the
Amateur Satellite Service, of course, but the limited bandwidth of the band
might cause conflicts if the satellite continues to function when the solar
cycle starts to perk up again. 15 meters, on the other hand, has plenty of
room, especially if you put the uplink somewhere above 21.400.
On Thu, May 26, 2016 at 1:45 PM, Robert Bruninga <bruninga at usna.edu> wrote:
> I may have a launch opportunity for an HF=HF transponder for a
> possible cubesat idea. Probably something like 12m up and 10m down?
> Is this worth doing (re-doing) at this point of technology? Enough
> bandwidth to support a few voice channels?
> Any volunteers to build the translator board?
> How is 24 MHz band used? The entire SSB portion of the band is only
> 60 kHz, so using say 15 kHz for a linear translator to 10m would be
> quite a slice. But then the downlink at 10m would be OK since it does
> have an exclusive satellite band and so any inadvertent QSO's would be
> coming down in a non-competing downlink
> Just some open ended thinking after Dayton.
> Bob, WB4aPR
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