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SIMPLE_SWR_BRIDGE

2016-05-19 06:38  
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SIMPLE_SWR_BRIDGE
This circuit can be used to measure SWR. It uses a coupler made from a 6.5-inch piece of RG-58A/U coax. First remove the outer plastic jacket, then open up the braid a little bit. Next, thread two lengths of #22 tinned bus wire into Teflon spaghetti. Then thread the insulated wires inside the braid, trying to keep them on opposite sides of the center conductor. Be careful to keep the leads to the 1N67A diodes and the 150-Ω resistors very short. If you can't find 1N67A diodes, use 1N34. The RG-58A/U braid should, of course, be grounded at both ends. If the device is carefully constructed, the result should be a perfectly balanced VSWR meter. It should need no adjustment.