[Amps] Where is power measured ?

Wed Apr 6 05:35:15 PDT 2011

On Wed, 6 Apr 2011 05:11:49 -0700, "Jim Thomson" <jim.thom at telus.net>
wrote:

> Someone mentioned that in the US, the power is measured at the back of the amp. 
> Your rules don't stipulate where it's actually measured.  Dave Leeson, and other's,
> contacted FCC officials, and the FCC said it was reasonable to measure the power at the
> load, IE: ant feed-point.

Jim, the U.S. rules do stipulate when power is to be measured and I don't
see vagueness or any scope for reasonableness that you appear to be
suggesting.

"PEP (peak envelope power). The average power supplied to the antenna
transmission line by a transmitter during one RF cycle at the crest of the
modulation envelope taken under normal operating conditions."

The UK rules do allows the measurement of power at the antenna.

Tony W2TG & G3SKR