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archer / radio - shack swr / f.s.m. meter schematic
In article ,
walt wrote: got a model # 21 - 575 anybody got the schematic ? Odds are it's a generic power meter.... directional coupler, rectifier, filter and meter. The fancy part is the directional coupler. There's a schematic for a very similar design in the older ARRL Handbooks, or you can look at this: http://www.qsl.net/n9zia/wireless/pics/dircoup.png Odds are the RS one uses the same meter for both strips with a switch, to save costs. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
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