[Amps] AM Downward Modulation

harold b mandel ka1xo at juno.com
Thu Apr 13 15:36:58 EDT 2006

In my screen-modulated days when the tetrodes in the exciter
were not neutralized, and not tuned correctly, and when
the screen supply was unstable my exciter would exhibit
downward modulation, whereby the anode current would
deflect downward on voice peaks from the quiet carrier

What does it mean when a Kenwood TS-450s/AT
downward modulates in AM?

The RF Power actually decreases in both average and peak 

The waveform fills with speech, but the envelope shrinks.

Anyone ever see this or know if it is normal?

All other modes transmit normally.



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