Hi Mike,
If you want to have a key instead of a tone, then you must make a logic
level from the tone. There are several possibilities of course. You may
use a bipolar transistor that is switched by the soundcards tone, then a
diode and a RC circuit and a FET to key the PA. If you just intend to
transmit QRSS-3, then the time constant is not critical, maybe 0.1
seconds or so. And a tone of 1 kHz or higher.
But why do you want to use SpecLab for keying the PA if you don't need
the tone? The normal QRSS3 is perfectly generated by Rik's program.
73, Stefan/DK7FC
Am 10.04.2012 20:08, schrieb Mike Dennison:
OK. Thanks, Stefan, but I have most of that already. I have selected
QRSS3 and set up the COM port. What I don't see anywhere is a setting
that tells the software not to generate the QRSS as an audio tone,
but to send it as a DC command to the COM port instead.
I presume I should be able to type in the Transmit window of the
Digimode Terminal, hit TX and then it will key my oscillator - but it
doesn't. I know the connection to the COM port works as the Test
button keys the Tx.
Any thoughts?
73 de Mike
========
Ah, i forgot:
Am 10.04.2012 16:54, schrieb Mike Dennison:
I can configure SpecLab so the COM1 port will switch the key on and
off (using a helpful TEST button), but I can't find anything that
will connect a text input to the COM port.
Open the components register card and then the digimode terminal 1.
Here you can choose QRSS-3 or 60 in the predefined settings. You can
then change the symbol rate to what you want, e.g. QRSS-60000 or CW at
200 BPM :-)
You have to define which cable of the RS232 is used for PTT.
73, Stefan
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