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[AMPS] daf on-air amplifier testing

To: <amps@contesting.com>
Subject: [AMPS] daf on-air amplifier testing
From: nospam4me@juno.com (nospam4me@juno.com)
Date: Sun, 26 Dec 1999 22:20:41 -0800
[snip]
>From: Colin 
>...I do not know that the G2DAF design is good or bad, and I would 
>not use it on the air without testing, what I am objecting to is the 
>thought process and testing procedures of Rich.  They are flawed.  

how..?

>His assertions and conclusions may be correct - but not for all the 
>reasons stated.

Let me tell you about my testing procedures for Norm's  DAF 
amplifier.  During a casual conversation with a weak, out of state 
mobile on 7255 lsb, very heavy spectral buckshot from an operator in 
conversation on 7258 lsb would cover the mobile's signal. 
A quick dial up the band would find Norm as the source of the 
buckshot among the 10 or so other operators.  After Norm turned 
the amplifier off, I could resume my conversation with the mobile 3KHz 
down the band.  
I've not been bothered by Norms amplifier in some time now, probably 
because I've since learned it'd been modified to use a fixed screen 
potential.
In case it was never mentioned, Norms amplifier used dual 4cx250s. I 
have a copy of the screen control circuit he used. Quite the interesting 
animal. 

>And, I do find it somewhat  disheartening to have a design from a 
>respected tube engineer (G2DAF) rejected because it
>is misunderstood and as a result of a flawed investigation.

Provide me with evidence the daf circuit operates within reasonable
values, 
I'll consider using it. So far the applied example on 7258 could be heard

quite  well down 3KHz, far above the operators using tubes with handles 
in their amplifiers. 
Since the screens were fixed, the buckshot went away. 

cheers
skipp

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