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for Bird Model 43 Wattmeter
Easily convert your Bird Model 43 to a peak reading wattmeter for SSB. LNA Tech PR-90M peak reading upgrade for the Bird Model 43 Wattmeters. Easy installation, mounts on the meter studs on most Model 43 meters. No soldering or added wiring. Switch extends from one side and AC adapter input extends from the other side of the wattmeter. These occupy the spare element openings on the two sides of the meter. Operates on 9 Volt battery in peak reading mode (battery not included). This is an aftermarket product for Bird wattmeters from LNA Technologies.
To check your meter for compatibility, remove the back cover, and measure the center to center distance of the meter studs. The acceptable range is 1.45 to 1.55 inches (36.8 to 39.3mm). (see diagram) Next, check the meter stud postion relative to the side opening holes. From the bottom edge of the studs to the top of the side opening, there should be 1.1 to 1.2 inches (27.9 to 30.4 mm). (see diagram) If the measurements of stud spacing and stud position are not within the listed range, the PR-90 board will not install without user inovation. Some users report of using "Z" bend adapters, or ring lugs as an adapter. Another option is to use the PR-80 universal board, and mount it using the four mounting holes, and wire it in as shown in the instructions.