[amsat-bb] Thoughts on ISS packet switch back to 145.825 MHz (long)

John Brier johnbrier at gmail.com
Sun Apr 16 15:01:57 UTC 2017

Regarding hardware modems working better than software modems, when I
first got into ISS APRS I read the thread below where someone had the
opposite experience. Maybe they hadn't enabled PASSALL.


I know if I record the audio from my Kenwood TH-D72 and play it back
through soundmodem it decodes packets that the radio doesn't decode.

I believe this can be seen in one of my videos about ISS APRS:


73, John Brier KG4AKV

On Sun, Apr 16, 2017 at 9:46 AM, JoAnne K9JKM <k9jkm at comcast.net> wrote:
> Hi Kevin,
>> What software would you run with your hardware TNC ? Wouldn't
>> UISS still need agw or direwolf, etc?
> I used the terminal emulator program called MFJCOM that MFJ used to sell
> with their TNC back in the 1990's. It came on 5.25 disk but I have a copy of
> it on an old computer hard drive ... good thing I'm an electronics hoarder.
> I still haven't tossed out PC's from the 1990's :-)
> The window MFJCOM software runs in is the command line interface. It pretty
> much looks like the window you get with the windows 'Run' command. Plain
> ascii, not much help for commands, no mouse, etc. When MFJCOM comes up in
> the usual TNC 'cmd:' mode you can send the setup and operating commands to
> the TNC. Once setup in the cmd; mode you issue a 'CONVERS' command to enter
> the UI mode. A ctrl-c gets you out of CONVERS and back to cmd;
> My article in the AMSAT Journal has a table showing the top dozen or so TNC
> commands useful for configuring a hardware TNC for operation with ARISS
> packet.
> I believe there would be lots of terminal emulator programs out there that
> get the job done. Running in this basic mode I'm talking directly to the TNC
> hardware. What the TNC receives is what I'd see directly in the terminal
> emulator window.
> I still have the hardware TNC project on my to-do list. Before I go so far
> as trying to bring up a 20 year old PC box I think I'll take Alan's advice
> and try Direwolf. Alan mentioned that Direwolf has some of the commands I've
> been missing via UISS - like PASSALL and ways to display some of the
> additional protocol.
> Now that I think about it, I have an old laptop with dual-boot linux and
> windows on it which also has a 'real' RS-232 port on it - I could see how
> linux based terminal emulators work too. Heh, the to-do list just got longer
> over here :-)
> --
> 73 de JoAnne K9JKM
> k9jkm at amsat.org
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