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QRP Wattmeter Photo

The Oak Hills Research WM-2 was designed specifically for the QRP operator. The unit operates from 300 KHz to 54 MHz. It will measure forward and reflected power at QRP levels down to 5mW. You can select from three full scale power ranges of 10W, 1W or 100mW with an accuracy of 5% of full scale. A rear panel switch allows you to select the internal 9V battery or external power jack for the operating voltage. The WM-2 now uses a very high quality American made 3" meter movement with a large easy to read scale. The meter circuit current drain is typically 1mA, making it great for portable use. The wattmeter can be left in line permanently with very little loss. The kit is supplied with high quality SO-239 connectors. The WM-2 is easy to build and align. The alignment consist of setting three voltages with your digital voltmeter. A source of RF is not required for alignment. The completed wattmeter measures (HWD) 4 1/2" x 3 1/2" x 4" and weighs 16 oz. The kit is complete with cabinet, high quality silkscreened and masked PCB, all components and instructions (less 9V battery).

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