I believe the stock element is fine. I have tried other electrets elements and all delivered less output. I did change I believe R63 to have higher output. Some suggested to use very sensitive elements (-24db/pa). Mouser and others have them. However upon a suggestion here in this forum I opted using a dynamic element and a Plessey SL6270C, which is not just a preamplifier, it is a compressor. So it delivers about 90mv whatever you shout or you whisper. Average power drastically increased. I have a mil manpack, which I love (my first solid state transceiver) that exactly use this type of Plessey Vogad compressor. My point is that with QRPs a compressor, not a preamplifier or equalizer, is what is really needed.
Il 21/gen/2019 13:53, "Paul Dobosz" <
pjdobosz@...> ha scritto:
Almost all of the land mobile (Motorola & Harris/GE/Ericsson/MaCom) are dynamic mics that have an internal preamp.? I've had an excellent experience using them in applications that were designed for Electret mics.? They are plentiful and relatively inexpensive in both NOS and used condition on the usual online sites? and are built extremely solidly..? The mobile mics tend to be quite heavy with most having a large piece of heavy steel inside for no other reason than to give them "heft".? I generally remove the weight as I wire the mic up for the radio I'm using it on.
73 - Paul - K8PD
