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[AMPS] Re:

To: <amps@contesting.com>
Subject: [AMPS] Re:
From: Peter_Chadwick@mitel.com (Peter Chadwick)
Date: Tue, 27 Jul 1999 09:36:23 +0100
Bill says:

>Peak envelope power (PEP) is 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.

This is the internationally agreed definition; it comes from an ITU
recommendation, which is accepted by IEC. Strictly, only a scope can measure
it, but in practice, meters are good enough with suitable circuitry and
calibration. Since most analogue scopes are only good to 5%, it's a bit
academic............calorimetric methods are best with two equal, non
harmonically related sinusoidal tones, run until thermal equilibrium is
established in the load ( or in the inlet and outlet temperatures). That can
be cross checked with DC. But is it worth it, I ask? Tune for maximum smoke
- and then back off the drive.

73

Peter G3RZP





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