On Wed,4/8/2015 2:22 AM, Steve Ireland wrote:
My current set-up isn’t working (sounding) well and the best thing seemed to be
to ask for some advice.
I'd guess that you're not using enough bias. Elecraft and others use
5.6K between V+ and the mic.
You may also be wearing the mic too close to your mouth. It will sound
better if you don't "close-talk" it. That will also reduce the level --
like RF, sound drops by 6 dB for a doubling of distance.
I wear my CM500 mic about 2-3 inches above and to the side of my mouth.
This prevents bass build-up from close-talking, reduces the level a bit,
and, more important, allows me to drink coffee and have an occasional
munch. :)
That 470/220 ohm pad may be the cause of your distortion -- the mic
probably wants to see a higher Z load (like the 5.6K resistor). You also
probably don't need the cap. Check the schematic -- I'd be VERY
surprised if there isn't one inside the box at that point. Remember that
electret mics have been commonly used in ham radio for a couple of
decades, and rigs are built to expect them.
I don't know the Orion, but Ten Tec was born of an engineer from the pro
audio world -- he started Ten Tec when he sold Electro-Voice -- and they
have always built radios that are quite tolerant of a wide range of
mics. I've used pro mics with my Omni V and they sounded great.
73, Jim K9YC
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