- Published in issue 1/1991 on page 58
SWR meter for 1.5 - 70 MHz
Waste not, want not! Radio amateurs are a breed of electronics enthusiasts who like to see every milliwatt of their precious RF power arriving where it belongs: at the antenna terminals. However, budgets being what they are (RF plugs and low-Ioss coax cable are pretty expensive ...), impedance mismatches occur readily between the transmitter and the aerial, causing power reflection. The low-cost instrument described here will tell hams operating in the 160 m through 4 m bands the ratio of the forward to the reflected RF power.