Date: Wed, 6 Apr 2011 08:52:11 -0400
From: "Paul Christensen" <w9ac@arrl.net>
Subject: Re: [Amps] Where is power measured ?
97.3(b)(6) and 97.313(b) require that maximum allowable power occur at the
transmitter output (aka, "TPO"). I prefer it that way rather than the FCC
start regulating power based on ERP or EIRP.
Paul, W9AC
## I stand corrected. After some research, it appears that part 97 has been
revised.
Back in the mid 90's, it didn't specify back of amp, or at the ant. Some FCC
types
said back of amp, some said at the ant. The new version of the rules appears to
just clarify
exactly where it's measured. Perhaps that's so the FCC fellow doesn't have to
climb to the
top of your tower with his bird in tow. So it appears you folks got
screwed....again. Your
current AM rules state 1.5 kw pep out. That implies 300-375 w of cxr. Any of
those old
plate modulated AM, ham rigs from the 50's would do an easy 800 w cxr....
and 3200-4000w
pep out.
## measuring at the feed-point or at the back of the amp has nothing to do with
ERP
In canada, it sez... "across an Z matched load" . The load is at the ant..so
that's where
it's measured. That only factor's in feedline loss..and nothing more. Ant gain
has nothing to do
with it.
Jim VE7RF
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