Marcus, Chris, and others:
What I am really trying to do is replicate a time-domain FSK modem I
designed in 1972 (using discrete components of course). It used a
crystal oscillator at 12,770 hz (square wave) and divided that by 5 and
then ANDed with the input signal. The other path divided by 6 and ANDed
with the inverted input signal. The two paths were ORed together and
divided by 2, giving a fairly good phase-coherent FSK with 1277 / 1064
frequencies. Low pass filtering followed.
Why don't I just switch between 1277 and 1064 signal sources? Because
the result is not phase-coherent.
My other objective is just to learn what I can do with Gnu radio :)
Cheers!
---
Barry Duggan
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