At 08:50 PM 4/5/2006, Lee A Crocker wrote:
KD5NWA
If you took the time to look at the back of your SDR
radio, instead of just popping off, you would see
there is a 1/8 inch jack called "out" which goes to
the output of the sound card. If you yank that
connector your transmitter will not transmit, and you
can have all the CW practice you want without
bothering anybody. Plug the sucker back in and your
ready to rock and roll.
Not exactly... removing the sound card input to the modulator doesn't turn
off the exciter chain. There WILL be some leakage through the QSE from the
DDS to the RF output, depending on the relative DC offsets. The modulator
is pretty well balanced (a lot better than most diode ring mixers), but
it's not perfect.
Jim, W6RMK
