I used my DS202 pocket scope, $99 Amazon, to read the output from the stock mic into the radio while saying aaahhhh at a normal volume. Then installed a SSM2167 board with a 10k potentiometer on the output and adjusted it for about 125% of the previous reading.? That little scope works great for audio levels.? It's cute too.
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Lee - N9LO?
"I Void Warranties"
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Lee