[TenTec] Re: what is so special about heil microphone elements?

[George, W5YR]

An added effect of impedance mismatching has to do not so much with "power"
transfer with mics but with frequency response. The classic D-104 - which I
used for many years and still have - sounded great with a hi-Z input. Feed
it into a low-Z input and all the highs disappear and you get the bassy,
slightly muddy sound we hear occasionally on the air.

So, two main effects: less output to drive the mic preamp circuitry and
decreased  high-frequency response.

73/72, George
Amateur Radio W5YR -  the Yellow Rose of Texas
Fairview, TX 30 mi NE of Dallas in Collin county EM13QE
"Starting the 58th year and it just keeps getting better!"
w5yr at att.net





----- Original Message ----- 
From: "Stuart Rohre" <rohre at arlut.utexas.edu>
To: <tentec at contesting.com>
Sent: Wednesday, October 29, 2003 3:21 PM
Subject: Re: [TenTec] Re: what is so special about heil microphone elements?


> Actually Bill, for mike use, you do not have to rigorously match the load
to
> the source impedance, if the load is as high as tube and early
semiconductor
> rigs were.  You wanted the load to be higher than the impedance of the
mike.
> However, now, many circuits are set up for 600 ohm mike inputs, and load
> down the old higher impedance source crystal and dynamic mikes.  The
> matching of impedances is used for power circuits like audio outputs while
> mikes are voltage source devices, not current sources like high power
audio
> output stages and RF circuits for output stages.
> 73,
> Stuart
> K5KVH
>
>
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