#psk31 — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #psk31, aggregated by home.social.
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Had a silly thought with SSTV just now, thinking abut the whole issue with AltText.
There are two SSTV bots that I know of, operating here on the fediverse. @aregsstv and @vk4msl_sstv.
One provides a generic "static" alt text, the other provides none at all. Both for the same reason: the medium doesn't provide such a facility because the mode is inherently visual, sometimes the image doesn't even make it clearly across the ionosphere.
I wonder how practical it'd be to encode/decode a PSK31 carrier just adjacent to the SSTV signal. Typical SSTV bandwidth occupies ~500Hz to ~2500Hz.
The challenge being a SSB signal is normally not that wide, which is why I'd have to use a slow mode like PSK31 and not something faster. The PSK31 signal seems to occupy about ~200Hz of bandwidth. There looks like on sufficiently wide SSB tranceivers, we could squeeze something in at ~2750Hz, assuming it doesn't confuse the SSTV decoder.
The length would not be long. Alt text for short modes like the Robot modes (7~36 seconds) would be all but impossible. The plot here is a Scottie S1 signal, transmission time about 2 minutes (https://vk4msl-bm.local/sstv/rx/2026-02-08T05-09Z-S1-VK4CAU.png).
2 minutes of PSK31 would get you maybe 400~500 characters to describe the image. Not a lot, but better than nothing. We'd get about 200 with Scottie S2, and of course Pasokon P7 would let you be quite verbose.
The challenge is how much the extra carrier would perturb the SSTV detector, particularly in wide receivers.
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More #PSK31 programming today. To test my receiver code I simulated the character error rate (CERR) based on 256k characters of Lorem Ipsum. The graph shows the CERR versus the signal to noise ratio(SNR) of the received signal. Simulating the CERR makes more sense than the bit error rate (BER) because the PSK31 alphabet (a.k.a VARICODE) varies in the number of bits per character. #hamradio #dsp
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I don't feel BAD now. I did this once many years ago. Thomas #K4SWL Mr. @qrperdotcom does #PSK31 with a #MorseCode CW Paddle and Winter Portable #POTA Hunting! #AmateurRadio #Hamradio #parksontheair
https://youtu.be/Uj5VQ1bJ_iY? si=FuGjwKPsg4tXPs6w via @YouTube
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Its another Sunday edition of "A Cup of Joe Patio" #Amateurradio #hamradio Today, working a little #QRP #PSK31 #digitalhamradio #Hamradiodeluxe #HRD #FT817 #Signalink
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Gosh, it's been many years since I've done this mode #PSK31. #amateurradio #hamradio so GRAND. So many options.
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Couple #HamRadio highlights of the day:
- First #PSK31 contact (would help if someone nearby wasn't 30 over 9...)
- First CW contact (I'm cheating with #fldigi, sue me)
- Found what appears to be an ARDOP BBS (though I have no clue what software stack I'd need to interface with that)
- And I've blown up a CB radio. Again. Again.
Next on the list is RTTY but that'll come Eventually™️
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@F1RUM Over the weekend I could reach the LZ3CB #Winlink gateway in 40m with 10W, using #VARA, from QTH. But from mobile (car rooftop antenna, 5W) I am limited to 20 and 17m. With #PSK31, I can really work all over Europe and Middle East. What bothers me is the commercial restriction of VARA... 69€ for a licence is a lot.
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@robotfactory nice! that's awesome, I mostly do FT8 or SSB when I'm physically at my radio. good luck with #PSK31 😃
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📢 Any volunteers for discussion in old #digimode ?
Rendezvous every day at 19:00 UTC on
📻 3.580-3.583 MHz
📻 7.040-7.043 MHz region 1&3
📻 7.070-7.073 MHz region 2
📻 10.142-10.143 MHz
📻 14.070-14.073 MHz
📻 18.103-18.104 MHz
📻 21.070-21.072 MHz
📻 21.085-21.087 MHz
📻 24.920-24.921 MHz
📻 28.070-28.073 MHz
📻 50.305-50.307 MHzin USB on all bands.
Generally, #PSK31 at the beginning of each frequencies range and #MFSK #Olivia #Hellschreiber ... at the endShare this announcement !
