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The key to making any kind of "stinger board" work, is keeping the RF it generates out of the radio's circuits, shielding is fine, however it does not seem that anyone has made the leap of imagination to keep the power feeding the stinger board clean. someone said something about the stinger...

This Mod can be done on the Cobra 148 boards used in various models as well, although the band end of the diode points away from the mounted transistor, and I think connects to the leg closest to the back of the radio, and then to a pad with 3 or 4 solder points on it. Anyone have a diagram of it?

I would connect the amp output to a 50ohm dummy load, then hook up an antenna analyzer like an MFJ 259B, and see what your input impedance/SWR is. There is often times a trimmer capacitor that can be adjusted inside the amp on the input rail, and trimmed so that the radio see's a good load to...