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
-----Original Message----- From: AMSAT-BB [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Paul Stoetzer 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.
73,
Paul, N8HM
On Thu, May 26, 2016 at 1:45 PM, Robert Bruninga bruninga@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 _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
_______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb