[AMRadio] re: Apache audio Real good

[Gary Schafer]

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?

73
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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