K values are a best guess from the 2X of Class C.
The important part is to get the L correct for efficiency as long as the
harmonics meet specs.
Carl
KM1H
----- Original Message -----
From: "peter chadwick" <g8on@fsmail.net>
To: <amps@contesting.com>
Sent: Tuesday, March 11, 2014 12:25 PM
Subject: Re: [Amps] Pi-L Network Question
Jim,
I used your values to calculate (by a series of parallel - series and
series - parallel transforms, the back of the NCJ renewal notice and an
HP41CV!) a plate impedance of 717 ohms at 1.8 MHz.
I take it we're talking grounded grid AB2? In that case, RCA say the plate
load, Rp is:
Rp = 2 (Plate voltage DC - minimum plate voltage + Peak grid voltage) /
Peak plate current.
I suspect that Vic may have a point about what the plate load should be:
RCA don't use K values for AB1 and AB2 calculations.
73
Peter G3RZP
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