[amsat-bb] Re: AMSAT Board of Directors Candidates

Stephen E. Belter seb at wintek.com
Thu Jun 17 14:27:58 PDT 2010


When I saw the ARISSat-1 prototype operating at the Dayton Hamvention, the linear transponder, the CW beacon, and the FM telemetry/announcements/SSTV all operated *simultaneously*.  

Note that ARISSat-1 does not have an FM repeater mode.  The FM transmitter is used alternately for telemetry, voice announcements, and slow-scan TV pictures.

Gould's presentation on ARISSat-1 from the AMSAT Forum at Dayton is on the AMSAT website.  It includes slides with diagrams of the uplink and downlink frequency plan, and a waterfall display of the transmitter output.  The waterfall clearly shows the linear transponder, CW beacon, and the FM channel.

My expectation is that the linear transponder will be operational as long as either the battery or the solar cells are providing power.

73, Steve N9IP
Steve Belter (seb at wintek.com)         My Desk: 765-269-8521

> -----Original Message-----
> From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
> Behalf Of Vince Fiscus, KB7ADL
> Sent: Thursday, June 17, 2010 3:07 PM
> To: amsat-bb at amsat.org
> Subject: [amsat-bb] Re: AMSAT Board of Directors Candidates
> At 05:11 PM 6/16/2010 -0400, G0MRF at aol.com wrote:
> >In a message dated 16/06/2010 22:09:24 GMT Daylight Time,
> vlfiscus at mcn.net
> >writes:
> >Why does everything always have to be FM all the time.
> >
> >
> >But doesn't Arissat-1 include a linear transponder ??
> >
> >David
> Arissat will be fun, but objects launched from the ISS don't stay in orbit
> all that long. The linear transponder is going to have to compete for time
> with all the other downlink  modes & experiments the bird can do.  I'm
> thinking the linear transponder probably won't be turned on much, because
> it might upset the FM'ers.
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