[Elecraft] Transformer

[David Robertson]

Vic,

If your transformer is a true 1 to 1 winding ratio the RMS voltage measurment of both the primary and secondary should be the same. In your case either the turns ratio are not 1 to 1 or you have a shorted turn in the primary winding. If it a shorted turn then even though the actual turns ratio is 1 to 1, if there is a shorted turn in the primary, the electrical turns ratio will not be the same.  If you connect the transformer with the secondary as the primary, your output voltage RMS will be lower.

73
Dave KD1NA

From: Vic K2VCO <vic at rakefet.com>
To: Elecraft Reflector <elecraft at mailman.qth.net>
Sent: Sun, August 1, 2010 5:24:04 PM
Subject: [Elecraft] Speaking of off-shore manufacture...

I just bought a transformer, primary and secondary both spec'd at 120v. My line 
voltage is 

119.5 -- the secondary voltage is -- get ready -- 148v! The only thing I can 
think of is 

that this is supposed to be the voltage under load. But I didn't think that 
transformers 

were spec'd that way, normally.

It's a good thing I'm not building a helicopter or something.
-- 
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/