|[AMRadio] watt meter|
k4kyv at hotmail.com
Sun Mar 12 00:52:26 EST 2006
>From: Brett gazdzinski <brett.gazdzinski at verizonbusiness.com>
>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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