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Re: [Amps] IMD & ALC's

Subject: Re: [Amps] IMD & ALC's
From: Radio WC6W <>
Date: Sun, 4 Jan 2004 08:55:45 -0800
List-post: <>
On Sat, 03 Jan 2004 16:51:01 +0000 GGLL <> writes:
>     If one could just use it as a  50 watts exciter (sliding the 
> internal 50 W setting switch) with/without a 50 Watts only demanding 
> linear, could this working mode being an improve in IMD?, is still an 
> ALC overshoot?.
> I have a 440 also and don't know (never tried that) what happens with 
> ALC readings in the 50 watts max. output.
> Best regards
> Guillermo - LU8EYW.

Hi Guillermo,
    If I recall correctly from looking at the schematic years ago with
all the little wires running between all the boards, I believe that would
only change the ALC threshold on the forward power sensor so... whatever
compression, and overshoot, would occur at 50 watts rather than at 100.

   I think the best approach is to control (limit) the mike level
externally and then just use the radio's mike gain as a power set.  
Then, the 440, or an attached linear, is never overdriven and never run
into ALC.

  I do run the ALC line back from the amp to the exciter, just in case
something is set wrong!  I've a "blinky-light" (indicator driven by a
one-shot) on the amplifier ALC line that indicates any... wrongness.  :-)

73 & Good morning,
   Marv  WC6W


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