Oak Hills Research WM-2 QRP Wattmeter


Japanese : Jul. 19, 2011, English : Jun. 3, 2012
Last update : Jun. 3, 2012
Japanese page is here.

FlowerWM-2 QRP Wattmeter

I assembled a WM-2 QRP Wattmeter of Oak Hills Research in September 2010. Detailed specifications can be found on the manufacturer's website.

WM-2 QRP Wattmeter  WM-2 QRP Wattmeter rear panel

WM-2 QRP Wattmeter

PC board of WM-2 QRP Wattmeter

PC board of my WM-2 QRP Wattmeter

WM-2 QRP Wattmeter  WM-2 QRP Wattmeter

Inside of my WM-2 QRP Wattmeter

It is recommended that a user uses, for example, Scotch-Brite to make the cabinet clean. I went to buy it to a neighboring shopping center.

WM-2 cabinet and Scotch-Brite

Cabinet of WM-2 and Scotch-Brite bought at a neighboring shopping center

It is written in the assembly instruction manual that pot R14 needs to be set fully counterclockwise at the step 3.8, but I think it needs to be set fully clockwise, because the meter became overrange when I adjusted the 100mW range at the step 3.15.

I like WM-2 very much, because the meter is big and easy to read. Especially at 5 - 100mW and 0.05 - 1W ranges, it is much better than other meters.

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Copyright (C) 2012 by MATSUMOTO Koichi, JN3DMJ