On Sep 19, 2008, at 2:32 PM, Bob Cunnings wrote:
Yes transmit is restricted - to the 2.7 (or 2.8) kHz filter. Hence the
request to allow transmit using the 6 KHz filter, at least to same
extent as receive (up to 4KHz currently).
We all agree that you can receive in a wide passband (even as wide as
the 192 kHz that an LP-PAN provides).
For transmit, as long as the emission passband is not too wide to fit
the rig's transmit passband, modify the software to note the receive
offset that you have clicked in the waterfall and use CAT to apply the
offset as XIT (or switch between A/B VFO) when transmitting.
I.e., you can send an absolutely fixed AFSK tone (tones, in the case
of <m>FSK) from software and move the transmitted signal around in the
RF spectrum by using XIT (or A/B VFO). It should be a very simple
change to whatever software that you are using (if you have the
sources to the program, that is), as long as the program has access to
the rig's CAT.
The advantage of doing it this way is that it has no dependency at all
on how flat the rig's transmit audio passband is, since you are
transmitting with the same fixed tone no matter where in the waterfall
you have clicked.
You can also use the built in FSK/PSK generators in modern rigs to
modulate your rig. As long as you know what the tone/tone-pair it
uses is, you can apply XIT to move it to where the received signal is
in the waterfall.
73
Chen, W7AY
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