[amsat-bb] Going Digital Someday

[Paul Stoetzer]

Stefan & JoAnne,

NX9G and W0DHB attempted a FreeDV QSO via FO-29 about a year ago, but
I believe they were not able to compensate for Doppler well enough to
make it work.

73,

Paul, N8HM

On Tue, Oct 21, 2014 at 9:08 PM, Stefan Wagener <wageners at gmail.com> wrote:
> Point well made, JoAnne.
>
> Now, can AMSAT official support this mode, maybe help/encourage the
> developers and start to implement it (testing) on for example FO-29? What
> about a digital mode for the FM satellites? One of the big frustration I
> have is to decide which one of the digital modes to pick. What is beautiful
> about this hobby is the diversification which now also becomes the "curse"
> with promotion and competition of various commercial and open source
> modes/codecs. Maybe we can help and focus on one "system" for amateur
> satellite use and get it used/implemented.
>
> Food for thought,
>
> Stefan, VE4NSA
>
> On Tue, Oct 21, 2014 at 4:10 PM, JoAnne Maenpaa <k9jkm at comcast.net> wrote:
>
>> During the Symposium in Baltimore last week there was a discussion that I
>> found quite interesting. Billed as a proposal for fairly long-term, future
>> AMSAT HEO possibilities, this blue-sky proposal offers projects that will
>> be
>> fun for myself (and maybe yourself) to learn what's next ... or could be
>> next ...
>>
>> It seems the cubesat form factor is here to stay for practical launch
>> opportunities available to us ... (please don't ask for getting a phase
>> III-B form factor in this thread!) Wiser people than myself have assured me
>> of this.
>>
>> Analog SSB and CW modulation in a 3U to 6U cubesat may not be practical at
>> HEO apogee due to antenna size limits on a cubesat and power generation
>> capability of the cubesat limited number of solar cells. Digital techniques
>> were described as a way to make this work.
>>
>> FreeDV HF Digital Voice for Radio Amateurs was one of the types of
>> technologies mentioned just as an example. I found a demonstration at:
>> http://nicktoday.com/freedv-hf-digital-voice-radio-amateurs/
>>
>> Interesting, eh? A soundcard interface to your existing radio, sound card
>> in
>> the PC, we're teaching ourselves the first steps into digital radio ...
>> getting ready for the future.
>>
>> I've only had to interface my soundcard interface to my Yaesu 857D just
>> once. The interface remains stable from a hardware point of view. My PC
>> runs
>> the appropriate software for FUNcube telemetry, SSTV from ISS and prior
>> ARISSat-1, PSK31, JT65, RTTY ... and when I get some time in between
>> preparing the next issue of the Journal I'll add the software for the
>> FreeDV
>> codec.
>>
>> Perhaps we'll hear more interesting ideas or a fresh approach! At least we
>> could have a thread with some fun discussion ...
>>
>> --
>> 73 de JoAnne K9JKM
>> k9jkm at amsat.org
>> AMSAT VP User Services
>>
>>
>>
>> _______________________________________________
>> Sent via AMSAT-BB at 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://amsat.org/mailman/listinfo/amsat-bb
>>
> _______________________________________________
> Sent via AMSAT-BB at 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://amsat.org/mailman/listinfo/amsat-bb