[nos-bbs] UDP remote control RTS based PTT

[M Langelaar]

Bob,

You need a RA board or SignaLink (vox device) by the looks of it,
there is simply no serial port setting. And honestly I can't justify
buying yet another interface card or board, RTS PTT has been good
enough for what I need.

The only thing (disclaimer) I forgot to mention here :
   (we might have talked about this part on an earlier thread, don't recall)

RTS goes high when you exit the PERL script. So make sure to
disconnect your PTT before exiting the script, actually it goes high
if I exit WinRPR or others as well. I need to improve the circuit some
how to prevent that, I haven't been able to find out how to get around
that, which is the only pain with using the RTS pin on serial for PTT.

Maiko

On 29/01/2021 1:00 a.m., Boudewijn (Bob) Tenty wrote:
> Why this indirect way? Is this because of the software processing delay of the VARA modem?
>
> Bob VE3TOK
>
> On 2021-01-29 00:28, M Langelaar wrote:
>> For anyone with the junk box RTS optoisolator PTT circuit :
>>
>> Very rundamentary, experimental, works for me. I have quickly updated
>> the documentation, it will need more work, but it's a start, a 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 ...
>>
>> Maiko / VE4KLM
>>
>>
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