Heathkit HM-2140 Manual page 5

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The HF Dual Wattmeter Model HM-2140 measures forward and reflected
power in transmission lines for frequencies between 1.8 and 30 MHz.
This Wattmeter was designed primarily for the Amateur Radio bands
within the high-frequency ranges on the 160, 80,40, 20, 15, and 10 meter
bands, and for other services which may lie in between the amateur bands.
The Wattmeter will measure transmissions: up to 200 and 2000 watts peak-
envelope-power in the forward direction and up to 500 watts reflected.
You can power the Wattmeter with a battery for complete portability, or
with the optional Heathkit Converter Model GRA-43-1where AC power is
available. No additional plug-in modules are required to cover the power or
frequency ranges. The Wattmeter is housed in a small, attractive, readily
portable cabinet.
A special switching circuit permits you to observe the battery condition at
any time. The remote sensor can be mounted into the cabinet or up to four
feet away from the metering cabinet and nearer to the transmitter's output
cables.
If you use only the 9-volt battery to power the Wattmeter, you must pur-
chase it separately. See Page 11 for additional details.
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