[AMRadio] watt meter


Donald Chester k4kyv at hotmail.com
Sun Mar 12 00:52:26 EST 2006


>From: Brett gazdzinski <brett.gazdzinski at verizonbusiness.com>

>Don,
>Does that do pep?
>Can you warm something up on the thermocouple?
>

No, it reads RMS feedline current in amps. Working into a dummy load of 
known resistance, watts output can be calculated by Ohm's law.  On the real 
antenna, I just use it to indiciate maximum juice, since the feedline is 
nowhere near flat and nonreactive.

The thermocouple is just a tiny little piece of wire inside the meter case, 
made of dissimilar metals, which produces a small direct current when 
heated.  The conventional DC meter movement reads that current, which is a 
function the rf current passing through the thermocouple.
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