[Lowfer] TAG in PSKAM10 Mode
John Andrews
[email protected]
Tue, 11 Nov 2003 12:55:59 -0500
Ed,
The only trouble with the transverter approach is with frequency stability.
If you do it right, it should certainly work in this application.
Remember that this application only requires translating a very small audio
bandwidth up to RF. For those who prefer to roll their own, and not tie up
the ham rig, there are the usual two approaches: filter or phasing. Lyle,
Dex and possibly others have done filter rigs by using tuned circuit filters
with the sound card output set to a fairly high audio frequency like 5 kHz.
I built a phasing exciter, and stick with my usual 800 Hz. The audio phase
shift can be done fairly simply as you aren't concerned with a 2-3 kHz wide
bandpass.
Either way, it would be fun to see more of the guys set up to put sound card
generated audio on the air.
John Andrews