The easiest way to tune it is with a signal generator driving it at 30 MHz
and a receiver or SA at the antenna connector. No voltages of course.
Move the rod closer or away with a non metallic object to determine if
signal increases or decreases, trim or add length as needed. Absolute
perfection not necessary but you want a good 25dB in/out isolation.
Carl
KM1H
----- Original Message -----
From: "B Osburn" <plantrunner5@msn.com>
To: "Amps List" <amps@contesting.com>
Sent: Thursday, March 14, 2013 12:23 PM
Subject: [Amps] Neutralizing push-pull amp
Neutralizing push-pull amp
In pictures I see about a 2” long rod about 1” from the tube plate. How do
you tune it? Keep making the rod longer/shorter? How do you arrive at the
initial location? This is for a pair of 4CX1500Bs: 2750V Plate, 225V
Screen, -34V bias on the grid, Class AB1, 160M-20M.
Brad AB0YD
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 10.0.1430 / Virus Database: 2641/5669 - Release Date: 03/13/13
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|