Note
QST, Aug 1957, p. 137.
QST, Mar 1958, p. 141. (new meter)
CQ, Dec 1963 p. 105.
CQ, Dec 1968, p. 41.
The CM-52 and CM-72 meters was designed for 52Ω and 72Ω impedance lines respectively. They are calibrated for relative power and SWR, and could be left in the line at power levels up to 1 KW. Frequency range from 3 to 200 MHz. No adjustment or balancing of the meter was necessary to read SWR.
The same unit was also available as two separate pieces–the meter and the sender unit, with ten feet of cable connecting the two. These were sold as the CM-52-2 and the CM-75-2.
