item.
73
Bob, K4TAX
On 3/23/2022 2:14 PM, elecraft-requ...@mailman.qth.net wrote:
Message: 1
Date: Mon, 21 Mar 2022 15:15:02 -0700
From: Fred Jensen
To:elecraft@mailman.qth.net
Subject: Re: [Elecraft] Knowles HC-3 Mic Element Replacement For Heil
HC-5
Message-ID:<1c983dc7-13f5-b532-9
On 3/23/2022 1:48 PM, JR wrote:
Carson using an RCA Type 77 DX ribbon mic in the NY shows. Later, Johnny
Carson used a Shure Model 33
In later years, once wireless mics had were well developed, they were
wearing wireless lavs, and the desk mic became a prop.
73, Jim K9YC
Wow! I supported myself in college working at the local [only] TV
station, KSBY, in the late 50's/early 60's. The CE worked my shifts
around classes, and I often did the 1630-signoff. Jack Parr had what
would become Johnny's slot then with that classic RCA on his desk. I
thought it was a
>Heritage Galleries & Auctioneers... sold Johnny Carson’s Shure SM33
Ribbon Microphone at auction in 2005 for $50,787.50.
Holy Mackinaw!
I've got one of those (not Johnnie's :-(
Wish me luck.
VE7XF
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Elecraft mailing list
Home:
Hi Fred -- It depends on what time you are talking about. Some sources
document Carson using an RCA Type 77 DX ribbon mic in the NY shows.
Later, Johnny Carson used a Shure Model 33 desk mounted ribbon
microphone - Carson switched from a RCA ribbon mic to this Shure style
in the late
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
I agree with Fred (Skip)- electret mic elements are hard to beat,
especially with Elecraft rigs or others which have frequency
compensation. The electret elements are small and inexpensive. With
their flat responses, they will need some equalization for use as ham
mics - reduced low
Expensive:
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
"It would be great if these elements could be modified to perform better"
Au contraire, Tony. They were designed for a particular purpose and
they perform very well for that purpose. Unfortunately, that purpose is
just not normally found in ham radio.
It is very hard to beat electret mics.
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
On 3/20/2022 4:56 PM, Fred Jensen wrote:
Designed for a very specific purpose. Don't know how any would sound in
ham service with a pre-amp, but Jim, K9YC, is on this list, he retired
from a career as an audio professional and so far, he's my go-to-guy.
Maybe he'll read this and offer his
Tony,
Every single "military microphone" I've ever encountered [a lot]
required very close talking to get any output. They're often used in
extreme noise environments and that's one simple way of removing the
ambient noise such as on an aircraft. They are often used right up next
to your
All:
I finally got the chance to test the Knowles HC-3 military microphone element I
ordered. The eBay seller claimed that it had the same frequency response as the
vintage Heil HC-5 and it is very close in that respect. However, it's not
nearly as sensitive as the Heil HC-5 so it requires A
could it be that Knowles was the microphone vendor for Heil for that
series ?
probably
On 2/23/2022 4:11 PM, Tony wrote:
All:
I just ordered a Knowles 2390 mic element which is supposed to be
identical to the Heil HC-5 in terms of frequency response. The eBay
seller states that these are
All:
I just ordered a Knowles 2390 mic element which is supposed to be
identical to the Heil HC-5 in terms of frequency response. The eBay
seller states that these are new in the box obtained from a workshop
that repaired equipment for the UK military. The size of the element is
similar to
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