[Amps] how to measure tank

[Robert Groh]

One thing to keep in mind - the input impedance of a GG amplifier is strongly influenced by the output tuning of the amplifier and the output levels of the amplifier.  Hence the suggestion that checking the input VSWR should be done with the amplifier loaded into a dummy load and all tuned up at nominal operating conditions.

73
Bob Groh, WA2CKY
Blue Springs, Missouri




________________________________
From: Jerry K <w5kp at hughes.net>
To: George Badger <gbadger at sbcglobal.net>
Cc: amps at contesting.com
Sent: Sunday, November 30, 2008 9:10:45 AM
Subject: Re: [Amps] how to measure tank

I have a question about the other end of an amp. I don't own a monitor, 
but could an MFJ-259 be used to tweak the bandswitched input tuning 
coils of an AL-811 by sweeping the input (while keeping the keying relay 
manually closed)?
Jerry W5KP


George Badger wrote:
> Lynn
> Put a resistor from plate ground to simulate the load and look into the output with an MFJ 259. Tune for a match. Works like a charm.
> George    W6TC
>
>
> ----- Original Message ----
> From: Lynn Osterbur <no9z at yahoo.com>
> To: amps at contesting.com
> Sent: Saturday, November 29, 2008 6:50:47 PM
> Subject: [Amps] how to measure tank
>
> I am starting to forget all I know!
>
> Components  Homebrew amp and cushman service monitor
>
> What is the proper way to measure a pi network with a tracking generator and spectrum analyzer.
> I am mostly interested in the connections to the tank circuit.
>
> using cushman 5100 with tracking generator and spectrum analyzer.  I havent used it for 
> 3 or 4 years and that was on a set of 2m bandpass filters.  I also assume that I will need to
> put a load resistor across the tube equal to the load resistance.
>
> Lynn NO9Z
>
>
>      
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