"Yes, and with some mics, how close it is to our mouth. Directional
mics, called a "cardioid" because of the shape of their pattern,
emphasize bass when very close to the source. Virtually mics for live
musical performance have this characteristic."
That was true in spades for the RCA "velocity" [ribbon] mic at an FM
station I worked at when starting college. I forget the model number,
it was sort of prismatic in shape, maybe 7-8 in tall, and fairly heavy.
I had to open the station and sign on 3 days a week, I was 17 and my
voice sounded like it. I discovered via one of the Ampex tape recorders
that if I got up real close to that mic for the sign-on announcement, my
voice sounded a whole lot deeper [and older and wiser 😉]
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
Jim Brown <mailto:[email protected]>
Wednesday, June 25, 2025 12:03 PM
On 6/25/2025 9:34 AM, Fred Jensen wrote:
Very interesting discussion. I'm not a SSB op but I do listen some
and occasionally chat with friends. On my P3 with a fairly narrow
span, I notice that a lot of signals [like most] seem to have most of
their power concentrated close to the suppressed carrier frequency.
Yes, and that power close to the suppressed carrier is all wasted
low-frequency transmitter power. About 3 dB!
From the
discussion here, I get the impression that the microphone is the
primary driver of the transmit audio spectrum.
Yes, and with some mics, how close it is to our mouth. Directional
mics, called a "cardioid" because of the shape of their pattern,
emphasize bass when very close to the source. Virtually mics for live
musical performance have this characteristic.
I use a K3 with a Yamaha CM500 and have the TX EQ set to K9YC specs
and my spectrum is fairly flat, maybe a little weakish in the lows.
Yep.
73, Jim K9YC
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Joe Subich, W4TV <mailto:[email protected]>
Tuesday, June 24, 2025 6:04 PM
On 2025-06-24 5:44 PM, bill kipping via Elecraft wrote:
> but the best is the choice is the Shure 450, dual impedance with a
> wider frequency response
No, the best choice is the 444D. You *DON'T WANT* a "wide frequency
response" mic for communications. The 444/444D response is tailored
specifically for SSB communications and paging purposes - i.e., maximum
voice "punch".
73,
... Joe, W4TV
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bill kipping via Elecraft <mailto:[email protected]>
Tuesday, June 24, 2025 2:44 PM
The 444 is HiZ, the 444D is dual Z, high and low. The mobile versions
404C is HiZ the 404B is LowZ, but the best is the choice is the Shure
450, dual impedance with a wider frequency response
BillKE7KK
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Jim Brown <mailto:[email protected]>
Tuesday, June 24, 2025 11:33 AM
Lo-Z.
73, Jim K9YC
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Steve Lawrence <mailto:[email protected]>
Tuesday, June 24, 2025 8:36 AM
There appears to be a LowZ and HiZ variations of the Shure 444
available in addition to the handheld version 404 and the 414. Which
is appropriate for the K3 (KX3, KX2)?
Otherwise, I like the idea of a “communications specific” microphone
tailored for a good voice intelligibility on SSB and new ones appear
to be rare, specifically with published response curves. So many are
mystery microphones with unstated acoustic/electric details.
Steve
AA8AF
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