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 (battery not included) or external power jack for the operating voltage. The WM-2 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, but if you would prefer BNC connectors, you'll find a conversion kit on our Parts Page. The power-on LED kit is optional because it will increase current requirements by about 30-50mA. It requires drilling a 1/4" mounting hole in the front panel but is otherwise a very simple and attractive mod based on a pre-wired LED and bezel assembly.
The WM-2 is easy to build and align-- alignment consist of setting three voltages with your digital voltmeter. A source of RF is not required for alignment.
The completed WM-2 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, DC power cord, and instructions.
Want OHR to build it for you? Click here for details.
Want a set of pre-wound toroids?Click here for details.
For detailed pictures of the WM-2 and more information, CLICK HERE!
|OHR WM-2 QRP Wattmeter Kit, $129.95|
|Build, Align, Test WM-2 QRP Wattmeter, $80.00|
|Power-On LED Option Kit for WM-2, $9.95|
|Install Power-On LED in WM-2, $15.00|
13.5V Power Supply for external power
12V, 7AH Gell Cell Battery
Fuse Holder and 1A Fuse
S0239 to BNC Conversion Kit
Push on PL259 Connectors
Tools and Solder