[NLRS] [BC'ers] Linearizing surplus Mitsubishi 902 modules

[Scott]

Put a 500 Ohm reisitor between the output of a 7805 regulator and 
ground.  Connect the wiper to the Vgg pin of the module.  Starting at 
zero volts, increase the pot until the module is drawing say 1/3 to 1 
times the current draw from the chart at the required output power.  
Achieve this output RF power by varying the input power near where the 
chart says this amount will produce the power output you are looking 
for.  Start with lower module current and adjust upward until the voice 
is not distorted on voice peaks.  The voltage to the Vgg pin should only 
be applied during TX or you will be dissapating a fair amount of heat 
for nothing.

Bruce Richardson wrote:
> That's interesting and I'll have to re-read your email a few times
> to ponder it.
>
> More what I was getting at is, in the Mitsubishi spec sheet, (link
> provided earlier) it talks about how to bias one of the pins into
> the module to get Class AB.  I didn't take the time to reread it
> lately, but given what it says, how might a guy come up with the
> proper voltage to follow the instructions in the spec sheet in a
> practical manner. I'm asking because someone asked me.  Apparently
> the reader has the 903 transverter, would like to use one of the
> Mitsubishi modules as his output, but wants to try and take
> advantage of any linearity the module will provide.
>
> (about to go read the spec sheet after all.....)
>
> Thanks,
> Bruce
>
>
> "When the going gets weird, the weird turn pro." - Hunter S.
> Thompson
>
> <Jerry's response snipped>
>
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-- 
Scott
http://corbenflyer.tripod.com/
Flying Corben Junior Ace - Building RV-4
Gotta Fly or Gonna Die