[AMRadio] Low modulation

Bill Smith hbco2 at sbcglobal.net
Mon Feb 19 20:14:40 EST 2007

I notice from the schematic, that there is also a tertiary winding which is
fed to the the driver stage.  Seems a long shot, but could it be out of

Also, what are you using to measure the capacitor.  A digital capacitance
meter will mask a poor power factor.  In other words, the cap could still be
open.  Can you substitute another?


----- Original Message ----- 
From: SBJohnston at aol.com
To: amradio at mailman.qth.net
Sent: Monday, February 19, 2007 3:38 PM
Subject: Re: [AMRadio] Low modulation

DOXEMF at aol.com writes:

> Mod Reactor shorted?

Ohms-out OK on a Simpson 260, but perhaps a problem under higher voltage?

> The cap to ground off the bottom of the Mod secondary good?

It measures the expected 4 uF value.

Bob wrote:

>Does that thing use feedback?

Yes, and I've tried it with the feedback ladder disconnected - no

>How about running solid tone for maybe five minutes.
>And then look for something that's overly warm.

Good thought - thanks.

Steve WD8DAS

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