43P Wattmeter

The Model 43P can measure peak RF power on pulsed signals with a minimum duty cycle of 2%, a repetition rate of at least 100 pulses per second (pps), and a minimum pulse width of 200 microseconds.

The Model 43P includes a side-mounted switch that lets you select between CW (average) and peak power measurement modes. Simply set the switch to your desired mode and read the power directly from the analog meter—no additional setup required.

In peak mode, it accurately captures modulation envelopes from voice audio or rectangular pulse signals, provided the signal meets the minimum requirements:

To measure peak power, press the on/off switch located on the right side of the meter. When the red LED is lit, the 43P is in peak mode.
To return to CW (average) power mode, press the switch again—the LED will turn off.

Because the peak detector has a response time of about one second, you may notice a brief delay before the meter reading stabilizes, especially when the transmitter is keyed or unkeyed. In voice-modulated systems, the needle may fluctuate slightly (typically 2–3 scale divisions) as the detector tracks changes in the signal's envelope.