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I am not an expert but I have tried many capsules types. Hams are obsessed about impedance mismatch. That is important at RF, as far as I know at audio what really matters is that the load, in this case the ubitx mic input has higher impedance than the load. For instance, a ceramic mic (apart from dc blocking) has a very high impedance, higher than the mic input and would sound extremely tinny. If your compressor has a lower impedance than the ubitx I think you might be fine. With my homebrew Vogad compressor I just use a potentiometer at the mic input so that I don't overdrive the mic input and tailor the ubitx output to no more than 8-10w.

Il 12/mar/2019 23:06, <frederick.brown@...> ha scritto:

I built a mic amp and compressor/limiter to use with my uBitx V4.3. The op amp in my mic compressor/limiter is sufficient to directly drive the dual diode balanced mixer. I was wondering what input impedance the mixer presents to the mic signal. I could put a series resistor in line with my compressor/limiter to avoid an impedance mismatch there.