[Amps] Where is power measured ?

[Vic K2VCO]

I remember that when the rules in the US were "1000 watts DC input" some CW operators 
deliberately built power supplies with very poor regulation. Of course when they measured 
the power they had to wait for the meters to 'settle down'. I recall some guy actually 
wrote about doing this in QST -- he said it gave the "leading edge of his characters more 
'presence'". Right.

On 4/6/2011 5:35 AM, Anthony R. Gold wrote:
> 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


-- 
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/