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wb2osz / direwolf

Dire Wolf is a software "soundcard" AX.25 packet modem/TNC and APRS encoder/decoder. It can be used stand-alone to observe APRS traffic, as a tracker, digipeater, APRStt gateway, or Internet Gateway (IGate). For more information, look at the bottom 1/4 of this page and in https://github.com/wb2osz/direwolf/blob/dev/doc/README.md
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AFSK 2400 Baud #479

Open oe3gwu opened 1 year ago

oe3gwu commented 1 year ago

Hello!

You support QPSK2k4. That is great. But it would be nice to have AFSK2k4. Out Winlink Digi used to run UZ7HO Sound Modem using AFSK 2k4, but we migrated to Linux and use Direwolf now. We downgraded to AFSK1k2 now. Would be nice to have the 2k4 option again.

73 Rainer (OE3GWU)

dranch commented 1 year ago

If you read https://github.com/wb2osz/direwolf/blob/master/doc/2400-4800-PSK-for-APRS-Packet-Radio.pdf , it talks about the various modes that were officially supported by TAPR modems but there is no mention of 2400bps AFSK. I searched around and I cannot find any mention of it anywhere and everything found (legacy AEA, TNC2, etc) talks about 2400bps support was PSK only.

It's also worth mentioning that per http://uz7.ho.ua/modem_beta/CHANGELOG.txt :

SoundModem v1.05 changes:

Soundmodem v1.05 was released back in December 2020 and the current version is v1.14 that was released in Oct 2022 (9 months ago). Is there any specific reason why you cannot switch to the standard 2400bps PSK mode?

wb2osz commented 1 year ago

(1) Do you know what tones that UZ7HO soundmodem uses for 2400 baud AFSK? I could not find it in the documentation or anywhere on the screen when running the application and selecting that speed.

(2) Would you consider the 2400 bps PSK mode used by some models from MFJ, AEA, and Kantronics? I tested it with various combinations of pre-emphasis/none and de-emphasis/none and it worked great.

73, John WB2OSZ

oe3gwu commented 1 year ago

Maybe different in us then eu. Tnc3, scs tracker and others supported 2400 and 4800 afsk. Nobody used qpsk here.

Von meinem iPhone gesendet

Am 07.07.2023 um 23:10 schrieb wb2osz @.***>:



(1) Do you know what tones that UZ7HO soundmodem uses for 2400 baud AFSK? I could not find it in the documentation or anywhere on the screen when running the application and selecting that speed.

(2) Would you consider the 2400 bps PSK mode used by some models from MFJ, AEA, and Kantronics? I tested it with various combinations of pre-emphasis/none and de-emphasis/none and it worked great.

73, John WB2OSZ

— Reply to this email directly, view it on GitHubhttps://github.com/wb2osz/direwolf/issues/479#issuecomment-1626124994, or unsubscribehttps://github.com/notifications/unsubscribe-auth/AEGOILZDT2KRM3N7JMB5DRDXPB3NDANCNFSM6AAAAAA2CCK6YI. You are receiving this because you authored the thread.Message ID: @.***>

wb2osz commented 1 year ago

(1) Do you know what tones that UZ7HO soundmodem uses for 2400 baud AFSK? I could not find it in the documentation or anywhere on the screen when running the application and selecting that speed.

4800 bps AFSK, through voice radios does not seem possible with the limited bandwidth.

oe3gwu commented 1 year ago

Sorry for the delay, I had some health issues the last week.

I dont know but I try to ask him. Maybe he shares the info. Otherwise we could simply try, but I dont have a Windows Computer near me right now.

oe3gwu commented 1 year ago

Here are some infos. I hope the help.

xtal=6.5536 lo=1774 hi=3251 center=2512 shift=1477

xtal=8.0 lo=2165 hi=3970 center=3067 shift=1805