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Author Topic: Older Shure 444 D to newer radios  (Read 344 times)

KT0DD

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Older Shure 444 D to newer radios
« on: January 11, 2023, 10:22:13 AM »

Hi, can the older Shure 444 D dual impedance mic be wired to a newer radio like the 7300 / FTdx10? Thanks for any Constructive replies. 73.

Todd - KT0DD
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N8YX

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Re: Older Shure 444 D to newer radios
« Reply #1 on: January 11, 2023, 10:39:53 AM »

If the rigs take a 600 ohm impedance mic, yes.

I've run a 444 and 450 with a number of later model transceivers.
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KT0DD

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Re: Older Shure 444 D to newer radios
« Reply #2 on: January 11, 2023, 12:35:25 PM »

If the rigs take a 600 ohm impedance mic, yes.

I've run a 444 and 450 with a number of later model transceivers.


Cool. It looks like all three modern radios I own have nominal 600-ohm mic impedance. Good to go. Thank you very much. 73.

Todd - KT0DD
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SWMAN

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Re: Older Shure 444 D to newer radios
« Reply #3 on: January 11, 2023, 06:57:05 PM »

 I have been using one of those mikes on my TS 570 for years and it works and sounds great.
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WA3SKN

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Re: Older Shure 444 D to newer radios
« Reply #4 on: January 12, 2023, 10:22:52 AM »

You can use any mic with any radio if you match levels and impedance... it's just not "plug-and-play".
Don't forget the supervision (PTT).
You do need to connect the leads to the right pins of the jack.

-Mike.
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WA2EIO

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Re: Older Shure 444 D to newer radios
« Reply #5 on: January 12, 2023, 10:38:03 AM »

Hi, can the older Shure 444 D dual impedance mic be wired to a newer radio like the 7300 / FTdx10? Thanks for any Constructive replies. 73.

Todd - KT0DD

The 7300 likes an electret type mic; the Shure may not have enough output, even it it is the right impedance.   Also, if you try it, be sure to block the voltage from the rig that is used to power the electret type mic that is usually used.
« Last Edit: January 12, 2023, 10:40:51 AM by WA2EIO »
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K1KIM

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Re: Older Shure 444 D to newer radios
« Reply #6 on: January 12, 2023, 11:10:43 AM »

You will be hard pressed to find a better mic for the 7300 than the HM-219 that comes with the radio.
Bob Heil designed that mic specifically for it.

But I do understand the desire to have a boom or desktop mic.
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N1RND

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Re: Older Shure 444 D to newer radios
« Reply #7 on: January 17, 2023, 06:34:03 AM »

The 444d is switchable, high impedance for tube rigs and low for solid state.
I have run one on my 7300, you might have to add some bass in the menu.
Also the 444d has as DC blocking capacitor built in to block the phantom voltage for elektret mics.
The owners manual is on the internet. It will only show wiring for up to the 1990s because the mic stop production around then.
I wired mine for my ic 765, which has the same pin out as the 7300.  Icom kept their mic pin out pretty consistent over the years.
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N1RND

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Re: Older Shure 444 D to newer radios
« Reply #8 on: January 17, 2023, 06:37:40 AM »

Also,  I find the shure is a bit more sensitive than a dynamic mic,  but on the icoms you will have to run higher mic gain than with an  icom mic.
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N1AUP

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Re: Older Shure 444 D to newer radios
« Reply #9 on: January 20, 2023, 12:46:04 PM »

I use my 444 with my Kenwood TM-D710G 2 / 440 radio.  No preamp enabled.  It works great!!
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K1VCT

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Re: Older Shure 444 D to newer radios
« Reply #10 on: January 28, 2023, 06:58:01 AM »

I've got a small harem of old mics here - Shure and ElectroVoice, and an IC-7300 as well.  The "444" ought to fit that category.

My own "fix" for all the old mics is to run 'em thru a preamp.  In my case an ART TubeMP - which are currently going for a stupid low $45 online.  Must be a close out.

I've made up a little "PTT box" with XLR input and 8-pin output.  There's a DC blocking cap in there, and the box has send/receive to the preamp.  Used Cliff 1/4 inch jacks to keep the audio lifted from the chassis of the box.  That particular preamp has switchable 48v phantom power on the XLR inputs.  I am afraid that I'd turn on the 48v by mistake and fry something, so I opted for the 1/4 inch (Hi Z) connections.

That particular preamp is set quite low, and the radios gain stays at 25 percent.  Except for one noisy element I've got here.... all the old mics work great thru it. 
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