[AMRadio] Transformer

John E. Coleman (ARS WA5BXO) wa5bxo2006 at pctechref.com
Thu Feb 1 16:12:14 EST 2007

	Is this a plate XFMR?
If it is a plate transformer, then 50,000,000 ohms is a lot of resistance
for 117 volts.  The leakage current would be a about than 2 micro amps
assuming the leakage was near to the top side of the 117 volt winding.
However, as some one else said, it is not a good sign.  I would bake it and
if you need to use it I would check leakage current with some HV DC applied
to the one wire of the winding being checked. 
John, WA5BXO

-----Original Message-----
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of Rick Brashear
Sent: Thursday, February 01, 2007 2:43 PM
To: Discussion of AM Radio in the Amateur Service
Subject: Re: [AMRadio] Transformer


That's not what I wanted to hear, although I almost knew it to be true.  
>From primary to secondary I have infinity after a couple of seconds, but 
from primary to frame I have about 50 meg.  I don't think it has been 
exposed to excessive moisture, but will bake it a while to be sure 
before I take the big plunge into my pocketbook.

Thanks for the response,

W4AWM at aol.com wrote:

>There should be no leakage between the two windings or between either
>or the frame...

> John,  W4AWM

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