> Okay, I'll be the one to ask the stupid question--so there's been a
certain
> amount of enthusiasm expressed over the wide bandwidth which is fine.
What
> about the opposite extreme? Will the radio allow unintelligible
narrowness
> or impose some lower limit?
I know that the Pegasasus will allow narrow filters on TX. While working on
some experiemental software, I ended up calling a station with a TX filter
of 300 Hz. He was very patient and tried his best to copy me, but it was
tough. I finally realized my mistake and opened up the filter and all was
FB.
For the soundcard modes, I wonder if the Tx filter really matters as long as
it is wide enough to pass all the audio with equal gain. IOW, if I have a 50
Hz wide PSK31 signal and transmit with a 3.9 kHz filter, my output signal is
only going to be 50 Hz wide (assuming, of course that the output of my
soundcard is clean and harmonic-free). I don't see any advantage to using a
100 Hz filter. In fact, given that with PSK31programs you usually move
around the band using different audio frequencies; with a narrow filter,
you'd have to retune your Tx filter every time you changed audio
frequencies.
Mark
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