On 3/21/2022 3:30 PM, CUTTER DAVID via Elecraft wrote:
Expensive:
Blame that on Bob Heil.
20 years ago when I started working with Knowles mic elements for Mil headsets they cost
the firm GBP15 each in lots of 20k. One of the main criteria was reliability. I recall
the output was 100mV with a standard close-coupled tone on the face of the capsule. The
instruction to the squaddie was "kiss the mic" to get the right output. The
noise environment was inside an APC etc and it was common for them to shout.
David G3UNA
On 21 March 2022 at 20:42 Tony <[email protected]> wrote:
Jim:
Close-talking" microphones are designed for use in very noisy
environments, like military aircraft.They are not directional, rather
they cancel all sounds more than an inch or two from their element.
73, Jim K9YC
That seems to be the case with the Knowles HC-3. It would be great if
these elements could be modified to perform better. I've been searching
for a drop-in headset element that has the same sensitivity and response
curve as the original Heil HC-4 / HC-5 (see below). They have great
articulation and work well with rigs that don't have TX-EQ. Used HC-4/5
elements are pricey!
Tony
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