Note
QST, Feb 1978, p. 155.
A power/SWR meter with a claimed SWR accuracy 100 times better than
typical meters.
The CPI Model WM-7000 uses a 30 dB directional coupler which provides accurate SWR readings to a ratio of 1.1:1. Most other SWR bridges use 10 dB directional couplers, accurately reading to only 2.0:1, and even some of the more expensive meters only use 20 dB direction couplers.
The unit reads peak or average power.
The 3-1/2-inch meter allows easy reading on three scales: 20, 200, and
1000 watts. The unit covers the 1.8–30 MHz frequency range.