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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Inexpensive fairly good quality home brew or kit RF power meter
I have a need for a power meter for general low band and VHF work. I
would like it to have at least two scales. One, a 0 - 10 W or so scale and if possible another which would enable it to measure up to around 125 W as well. The immediate need to satisfy the requirements of a job we're doing is for an instrument that can measure 1.0 W at 72.0 MHZ. The signal is AM with a duration of .50 sec. and there is some type of digital alarm transmission which modulates the carrier. The only way I think that I can do this now is to measure the RMS voltage accross a 52 ohm dummy load with my Boonton, and then calculate the power. I feel though that this is clumsy and may be potentially inaccurate. I'd love to have a Bird with all the bells and whistles but I really can't afford one. Does anyone know of a home brew project for doing this or even an inexpensive accurate kit? Thanks, Lenny. |
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