Hello The Net:
For portable operations with a laptop, usually only one input channel is
available
and it is at mike (not line) level.
The alternative to sum the analog reference and the analog signal of
interest may be
possible if the reference noise can be kept out of the signal of
interest bandwidth.
Maybe a external USB soundcard with at least 2 input channels is more
appropriate.
Stan, W1LE FN41sr Cape Cod
Alberto di Bene wrote:
J.D. Bakker wrote:
You could always transform this from a hardware problem to a software
problem. Take the output of your GPSDO, divide it down to somewhere
inside the audio band, feed it to a spare input on your USB sound
card and have software track this reference and correct the received
signal.
JDB.
I am in complete agreement with this kind of solution. Sampling on the
second channel a reference signal of known value allows the software
to make a simple adjustment. No need to switch on the soldering iron...
Never do in hardware what can be done in software.... :-)
73 Alberto I2PHD
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