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[AMPS] Tuned Input Circuit Q

To: <amps@contesting.com>
Subject: [AMPS] Tuned Input Circuit Q
From: philk5pc@tyler.net (Phil Clements)
Date: Sun, 7 Oct 2001 09:07:51 -0500
> //  The statement that  "or a parallel tuned network"  should be
> questioned.  A parallel tuned input will work ok only when the Q
> requirement is met and the average cathode-Z is close to 50-ohms.

Or the old Alpha trick of using an un-un transformer with parallel tuned
networks (when adding a second 8877 in the 77DX) can be employed.
This is much easier than trying to tweak a pi network for each band when
converting a 50 ohm tuned input to >50 ohms out. Only one part needs
to be installed. (the un-un) This will also work with an existing pi network
tuned input assembly. Just wind an un-un for the desired step-up/down
ratio and solder it in.

(((73)))
Phil, K5PC


(((73)))
Phil, K5PC




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