[AMRadio] re: Apache audio Real good

russ dworakowski wb3fau at hotmail.com
Mon Apr 15 14:33:36 EDT 2002

Same mod transformer same  mismatch.  EL 34s in
Appache 807s  in DX-100             Russ

>From: Gary Schafer <garyschafer at attbi.com>
>Reply-To: amradio at mailman.qth.net
>To: amradio at mailman.qth.net
>Subject: Re: [AMRadio] re: Apache audio Real good
>Date: Mon, 15 Apr 2002 11:03:04 -0400
>I don't know about the Apache but the DX-100 and Viking 2 have the mod 
>transformer ratio set so that the modulator tubes go into peak limiting 
>before 100% modulation is reached. This is a form of high level
>clipping. Most transmitters like that did the same thing. It would be 
>interesting to know if the mod transformer in the Apache has the same turns 
>ratio as the DX-100. Although it may still be different because
>I think that the DX-100 did not use 6146B's in the finals as the Apache 
>did. The Apache was designed to run at higher power than the DX-100?
>Gary  K4FMX
>"WILHITE, JIM" wrote:
> > I am not sure about the Apache manual, but the DX 100 manual says that 
>the modulation transformer is mismatched.  I am guessing that since the 
>design is pretty much the same that holds true for the Apache.
> >
> > 73  Jim
> > de W5JPW
> >
> > Russ:
> > I'm curious as what Apache manual you're reading. I can't find any
> > reference to where Heath engineers intentionally mismatched the
> > modulation transformer to force more audio through it. Are you refering
> > to the fact that they designed it for class AB2 audio or some other
> > evidence. See page 7, paragraph 7 of the manual: "The modulation
> > transformer provides the proper match between the modulator output
> > impedance and the load impedance."
> >
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