How about fldigi? It offers several modes, not too many, but allows for some room for everyone to explore their favorite mode..... Other software programs can run these same modes, but if we promote the one package (fldigi), we hope to limit the mides to a few popular modes rather than a free-for-all....... Just a thought.... Open to anything myself....
Doug K4GKJ
Doug Bennight K4GKJ 850-528-5772 850-926-2052
-------- Original message -------- From: Stefan Wagener wageners@gmail.com Date: To: JoAnne Maenpaa k9jkm@comcast.net Cc: AMSAT BB amsat-bb@amsat.org Subject: Re: [amsat-bb] Going Digital Someday
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@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@amsat.org AMSAT VP User Services
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://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://amsat.org/mailman/listinfo/amsat-bb
How about fldigi? It offers several modes, not too many,
Quite true ... Fldigi is a cool tool set. A lot of the high altitude balloon crowd seems to have found this program useful as well. Once you get your soundcard interface working with your radio and computer there are many options.
Using my 857D interfaced to an old WinXP box with a soundcard I can switch between JT65-HF, 1200 baud packet for ISS, receive AO-73 telemetry. Once I wrap up the November/December Journal I'll add FreeDV. No hardware changes needed ... click on a different icon and you have your new features/new mode.
-- 73 de JoAnne K9JKM k9jkm@amsat.org
Hi
fldigi does olivia and contestia, two modes that are tolerant to miss-tuning of a signal, that seems to me like a good candidates for beating doppler shifting, these modes are slow, sure but have respectable numbers in S/N ratio, these are a good candidates for satellite...
Does anyone have tried any of this modes on a SSB/FM bird?
The lighting fast multi-bpsk modes with auto RF-ID are another option for beating doppler... and are only 2.4 Khz wide...
BTW fldigi is open source, you can SEE and REVIEW/MODIFY the code, even with the help of the development team we can work together and get our custom "satellite modes" in it...
I'm the Spanish UI translator for Fldigi...
73
El 21/10/14 21:51, Doug - k4gkj escribió:
How about fldigi? It offers several modes, not too many, but allows for some room for everyone to explore their favorite mode..... Other software programs can run these same modes, but if we promote the one package (fldigi), we hope to limit the mides to a few popular modes rather than a free-for-all....... Just a thought.... Open to anything myself....
Doug K4GKJ
Doug Bennight K4GKJ 850-528-5772 850-926-2052
-------- Original message -------- From: Stefan Wagener wageners@gmail.com Date: To: JoAnne Maenpaa k9jkm@comcast.net Cc: AMSAT BB amsat-bb@amsat.org Subject: Re: [amsat-bb] Going Digital Someday
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@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@amsat.org AMSAT VP User Services
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://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://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://amsat.org/mailman/listinfo/amsat-bb
Analog SSB and CW modulation in a 3U to 6U cubesat may not be practical at HEO
If that were true then it follows that the modulation currently used with Codec2 Digital Voice is not practical for HEO either. Codec2 Digital Voice may use just over half the bandwidth of SSB but it is 100% duty cycle which which will increase the power drain on the satellite. Current Codec2 DV does not work at low signal to noise ratios - higher power would be required on the downlink to achieve satisfactory performance. That said, it may well be that a modulation scheme can be developed that can deliver a reasonable data rate to support speech, say 1600-2400 bps, at a low S/N (<10 dB) while not being critical on tuning. 73 Trevor M5AKA
If that were true then it follows that the modulation currently used with Codec2 Digital Voice is not practical for HEO either.
Quite true. The new HEO proposal warned that their scheme is not a replacement for AO-13. When most of hear "HEO" we visualize each QSO with its own discrete frequency on a VFO. The new satellite guys visualize many error corrected digital signals up and down; perhaps a multiplexed method. The satellite will need some processing power for error correction up there as well.
Hams learning how to interface a codec with their rig is merely a stepping off place.
Sooner or later they'll write up their proposal. I hope to run it in the AMSAT Journal. Give them time to work on it.
-- 73 de JoAnne K9JKM k9jkm@amsat.org
participants (5)
-
Doug - k4gkj -
JoAnne K9JKM -
JoAnne Maenpaa -
M5AKA -
Pavel Milanes Costa