All.
There is an excellent article published in Ham Radio Magazine dated
September 1972 on Page 6 through page 22 by Irvin M. Hoff, W6FFC titled
High-frequency power amplifier pi network design that should answer your
questions.. This is an EXCELLENT article on Pi and Pi-L design and would be
worth everyone reading it.
I'm not sure if the author is still around or not as I have attempted to
track him down and been unable too under either this call or his earlier
call K8DKC. This is the same author who did a lot of work on RTTY back in
the 60's and 70's.
73,
J. Leon Pringle, Jr W5NA
PRINGLE50@COMCAST.NET
W5NA@MDXA.ORG
----- Original Message -----
From: "Will Matney" <craxd1@verizon.net>
To: <amps@contesting.com>
Sent: Monday, April 10, 2006 12:17 AM
Subject: [Amps] Plate impedance
> All,
>
> I started reading through the RCA Radiotron Handbook this evening looking
> for where the factor of 1.8 is listed for calculating the plate impedance
> of a class AB amplifier, and I can not find it. The edition I have was the
> older one back in the 40's with the black cover. The red one was from the
> 50's and had more in it if I recall, but I don't have it. I was wanting to
> find where it gives this factor, and the ones for Class A, AB1, AB2, B,
> and C. Bill Orrs handbook gives the factor of 1.8 on his Pi tank values
> table, but doesn't mention anywhere in the text where it came from. I also
> looked in a RCA receiving tube book and could not find it there either, or
> I am overlooking it somewhere. I could have sworn it was in the Radiotron
> Handbook. The Handbook does say that the plate impedance is twice the peak
> voltage swing times the peak anode current. What I'm wanting to know is
> where are these factors located in print, as I'd like to read the whole
> texts concerning this? Any help
> would be deeply appreciated. Thanks to all in advance.
>
> Best,
>
> Will
>
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