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VE4KLM > VARA 29.01.21 12:33z 39 Lines 1514 Bytes #999 (0) @ WW
BID : A0BPR_VE4KLM
Read: GUEST
Subj: remote control RTS for PTT
Path: HB9ON<IW8PGT<IZ3LSV<IR1UAW<IW2OHX<UA6ADV<I0OJJ<VE4KLM
Sent: 210129/1231z @:VE4KLM.#WPG.MB.CAN.NOAM [Winnipeg] $:A0BPR_VE4KLM
For anyone with the junk box RTS optoisolator PTT circuit ...
Disclaimer : RTS line for PTT is dangerous, I am not responsible for
anyone burning out their TX because they left it unattended. The problem
with RTS is when the control program exits, it usually goes HIGH, and
that will trigger your Radio. I need to find a better circuit, perhaps a
combo
of serial line pins is the solution ? If you have 'cheap' circuit,
please share :)
Very rundamentary, experimental, works for me. I have quickly updated
the documentation, it will need more work, but it's a start. The VARA modem
does not appear to have direct serial port options.
Summary
-------------
1) install Strawberry PERL on your Windows PC
2) run a perl based UDP listener on your Windows PC
3) it respond to "PTT ON" and "PTT OFF" commands on UDP port 8400,
raising and lowering RTS on COM1 on the Windows PC itself.
4) xNOS now supports taking the PTT ON and OFF status information
it gets from the VARA software modem and sending it to this listener,
so if you have a cheap RTS line PTT (optoisolator) and a serial port,
then this is how you can trigger your rig.
I have NOT taken into consideration TX delay and related stuff (yet). The
VARA software is new to me. This is just something I slapped together,
since I needed a way to do PTT, and I can't justify to the wife having to
buy yet another interface board or box, yup ...
Updated -> https://www.langelaar.net/jnos2/documents/j2varanotes.txt
Maiko / VE4KLM
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