>Its hardly worth the bother taking IF output after the filter for scope
>monitoring. The filter cleans up most of the ills created in
>transmitters from clipping distortion to clicks on keying. At best its
>misleading.
That's the dilemma. However, I've now found a method to sample the 9 MHz
I.F. as a function of the front-panel-activated diode switches on the 9MHz
Filter Board. Presently, this would give me the ability to view four
filtering positions: the filter output of a 2.8 KHz, 2.4 kHz (N-1), 500 Hz
(N-2), or all filters bypassed. I presently use the bypassed filter
condition on CW transmit only to achieve a much cleaner transmitted CW
waveform. (for those interested, search the 1998 Ten-Tec archives for my
root-cause-analysis on what makes most Omni Sixes sound so poor on
transmitted CW).
I presently use a dual-trace lab-grade scope for monitoring my transmitted
signal via a Bird ThruLine non-rectified, variable coupler. It would be
great to be able to set the scope's "A" input for transmit and the "B" input
for receive. With both scope traces sweeping under QSK conditions, I'll be
able to simultaneously view my transmitter and receiver. This should be
very interesting.
-Paul, W9AC
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