Subj : Re: Packet BBS?
To : echicken
From : Ed Vance
Date : Mon Oct 07 2024 10:43 pm
> Re: Re: Packet BBS?
> By: claw to echicken on Thu Oct 03 2024 07:54:27
> I think some Kenwood rigs and possibly others have a TNC capable of 9600
> built in.
> In other cases, it may have a data/AF-in port that bypasses the microphone
> circuit, so you can plug in a TNC and not have its output mangled. Likewise
> the AF-out from that port should be independent of the volume dial and maybe
> some other audio-out controls.
> If your radio has an accessory / data port, this is usually what you want to
> hook your soundcard interface up to.
My setup for RTTY used a Demodulator circuit that was shown in the schematic
for a RTTY Reader article in Popular Electronics Magazine, I used the headphone
out jack on my 2M and on the HF rig(s) whichever one I was using at the time
(had 10 Turn Potentiometers for adjusting Mark and Space tones for what rig was
being used).
The Auto Frequency Shift Keyer was a 555 IC with two Pots for setting Mark and
Space Tones. Each Pot was connected to one of a resistor in the 555 circuit.
A friend told me over the phone how to modify the standard 555 circuit to get
it to switch tones. Output of the 555 went to the Mike jack of the rig being
used
They were connected to a Netronics RTTY/ASCII Video board to a TV set through a
RF Modulator so I could see what was Received.
A Netronics ASCII Keyboard I used for typing messages.
I also used a Cassette Tape Recorder to Save QSO's, and to sometimes play back
the QSO through the Mike jack, if I wanted another Ham to see what I saved.
Such as ARRL RTTY Broadcast I heard on the HF rig to pass it on the 2M RTTY
Net.
Still have it, but no 2M rig now, and no antenna connection to the HF rig.
BTW the HF setup was done using SSB mode.
Ed
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