[Amps] AM Downward Modulation

[R at contesting.com]

On Apr 13, 2006, at 12:36 PM, harold b mandel wrote:

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

It means that the carrier is not set to 25% of PEP.
>
> The RF Power actually decreases in both average and peak
> settings.
>
> The waveform fills with speech, but the envelope shrinks.
>
> Anyone ever see this or know if it is normal?
>
> All other modes transmit normally.
>
> Thanks,
>
> Hal
> W4HBM
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Rich Measures, 805.386.3734, AG6K, www.somis.org