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.
RF followers have a propensity to oscillate using the coax cable as the
resonant circuit, a grounded collector/drain/plate colpits oscillator.
They can sometimes be swamped to be kept stable.
73, Jerry, K0CQ
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