math’s notes

Simple Testers (Continued)

IRWIN MATH

As a continuation of last month’s topic, we will once again present a couple of simple, easy-to-build, circuits that we have used from time to time. Before proceeding, however, I want to point out some facts about the RF power meter we described last month. You may remember that to calibrate the unit, we applied a 10-volt DC signal to calibrate 1 watt of power at full scale of the meter on the device. A 1-watt CW RF signal is composed of a 20-volt peak-to-peak sine wave voltage or “Vpp”. After it passes through the rectifier diode, which cuts it in half, the result is a 10-volt pp signal or “Vpp”. This must then be further converted to “Vrms” (by multiplying it by the square root of 2 or 0.7071),…

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CQ Amateur Radio (Digital) - 1 Issue, March 2023

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