Jeff and all,
For a source of decent audio transformers for low power applications like
that, look at defunct computer modem cards. I have salvaged transformers
from them for computer to audio equipment isolation for some time now -
small and quite inexpensive (i.e. 'cheap', 'free', etc.) Of course the more
sophistocated way of handling such problems is with optoisolators, but they
are not usually free, and they require a voltage source - transformers
require no voltage.
73,
Don W3FPR
----- Original Message -----
Problem found. I added a fixed audio out port to the K2. Disconnecting the
wire to the sound card stopped the modulation. An audio transformer in
line
also eliminated the problem.
Jeff Burns
AD9T
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