[ARC5] Lopsided modulation

[Jim Wiley]

One reason could be that your voice in itself is non-symmetrical.  If 
you can do so easily, try reversing the "polarity" if the modulation 
transformer, and see if that helps.  If it does, your can leave it set 
the way that works best for you. Monitoring the modulation envelope with 
an oscilloscope is always  the best way.

- Jim, KL7CC



On 2/24/2018 11:38 AM, AKLDGUY . wrote:
> 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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