[ARC5] Lopsided modulation

[AKLDGUY .]

A friend and I are running Command transmitters on the local 75 meter AM
net, with full plate and screen modulation. We monitor our transmissions on
the local SDR receiver site which has a waterfall display. In both cases,
the lower sideband shows as considerably stronger than the upper, and this
has us perplexed. Our stations are the only ones affected.

I have never seen anything in the literature to explain this. Downward
modulation is a problem with AM, but articles do not indicate whether
lopsided modulation results.

My transmitter is the AN/ARC-5, absolutely unmodified and running 40W input
due to dynamotor constraint. His is the SCR-274 modified for plate & screen
modulation and running twice that.

Anyone suggest a reason for the unequal sidebands?

Neil ZL1ANM
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