On Wed, 28 Nov 2007 16:37:14 -0800, Frank Gilliland
wrote:

|On 28 Nov 2007 23:22:25 GMT, Steveo wrote in
:
|
|Jay in the Mojave wrote:
| Steveo wrote:
|
| Hey Jay I just picked up an mc-60 cheap for this kenwood, dude dropped
| it off for test and tune. It ain't an electro voice or a heil but i'm
| getting good audio reports from it at any rate. (i hit the up/down
| switch by mistake if i'm not careful) instead of the key.
|
| Hello Steveo:
|
| Yeah those MC60 mics are good mics. I had one and it sounded like
| broadcast quality audio. If you can get our hands on a Sure 444 those
| also great mic's.
|
|
|Hi Jay, yeah I've heard those Shure mics on the air and they have a nice
|sound too. Microphones are a strange bird, what sounds good on one radio
|may sound like crap on another. Heil makes a good sounding mic too imo. I'm
|happy with this mc-60 so far..but I'm always looking for better audio, you
|know how it goes..
|
|
|The two things to watch are impedance and output level. You need a mic
|with an output impedance that is equal to, or lower than, the input
|impedance of the radio. The Shure 444D and some other mics let you
|switch between low and high impedance outputs to better match the
|radio. As for the mic's output level, if it's fixed then you need to
|adjust the mic gain to match the mic. Note that high impedance mics
|generally have high output levels, and low impedance mics have low
|output levels. So if you want to use a low impedance mic with a radio
|that wants a high impedance mic, you may need either an impedance
|transformer or a mic pre-amp to get the level high enough for the
|radio to use.
|
|Sometimes I don't explain things very well, so if you got lost then
|let me know and I'll try to explain it better.
|
|--------------

Actually that was very well presented.

Shure also made a 444T that was a low impedance mic that had a built
in transistorized preamp to give enough umph.

james