Re: [TenTec] re Orion AM ALC

["Ron Castro" <ronc@sonic.net>]

Normal speech is by its nature asymmetrical which is why AM broadcasters use 
automatic phase rotators in their processing equipment to make sure the side 
of the waveform with the highest peaks is in the right direction.  No need 
for DC offset if it's done right.
           Ron   N6IE
      www.N6IE.com

----- Original Message ----- 
From: "Dr. Gerald N. Johnson" <geraldj@weather.net>
To: <tentec@contesting.com>
Sent: Saturday, June 12, 2010 6:59 PM
Subject: Re: [TenTec] re Orion AM ALC


> Now you are delivering distorted audio to the modulator, probably with
> some DC offset that isn't supported by capacitor or transformer coupled
> audio stages.
>
> To get asymmetrical modulation without over modulating going negative,
> you have to introduce the asymmetry AT the modulator, not before and the
> modulator has to be DC coupled at audio.
>
> 73, Jerry, K0CQ
>
> On 6/12/2010 8:55 PM, Rob Atkinson wrote:
> > Merle,
> >
> > What happens if you deliver asymmetric peaks, say 130% positive and
> > around 95% negative, to the rig?  Sounds the firmware is programmed
> > with the assumption everyone runs symmetric up and down.
> >
> > 73
> >
> > Rob
> > K5UJ
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