[Amps] how to measure impedence ??

[Dr. William J. Schmidt, II]

Lets say you wanted to measure the transistor side impedance of the 
transformer:

1.  Put a resistor across the secondary (output) side to mimic the load, 
typically 50 ohms.
2.  Use am Autek/ MFJ impedance bridge to measure the primary side at 
different frequencies.  You can make a plot vs freq/ make a smith chart, 
etc.

Sincerely,

Dr. William J. Schmidt, II  K9HZ
Trustee of the North American QRO - Central Division Club - K9ZC

Email: bill at wjschmidt.com
WebPage: www.wjschmidt.com

"If computers get too powerful, we can organize them into a committee; that 
will do them in."  -- Bradley's Bromide


----- Original Message ----- 
From: "Dan Sawyer" <dansawyer at earthlink.net>
Cc: <amps at contesting.com>
Sent: Saturday, February 19, 2005 10:09 AM
Subject: [Amps] how to measure impedence ??


> All,
>
> I am struggling with sorting out how measure impedance. I am building a
> solid state amp and am trying to sort out how the input and output
> transformers work. How can I measure the impedance of these
> transformers? There seem to be 3 main types; one built the way the
> Heathkit an EB app notes are built with the transformer material
> connected between pc board material and with a tube soldered between
> them. The next two are probably the same. They use either tube style
> cores or donut style cores; however the windings are typically coax.
>
> What is the direct method for measuring impedance?
>
> Does the coax simply act as two windings?
>
> Sorry for the dumb questions.
>
> Thanks,
> Dan
>
>
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