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Author Topic: Use Heil PR-40 dynamic mike with ICOM IC-705?  (Read 146 times)

N7LRG

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Use Heil PR-40 dynamic mike with ICOM IC-705?
« on: November 17, 2022, 07:32:45 AM »
I'd like to use this mic with my Icom IC-705. I could not find any commercially made harnesses so I called a guy who has made custom mic harnesses for me before. His question is will this dynamic mic work with this radio? Thanks in advance.
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K7JQ

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Re: Use Heil PR-40 dynamic mike with ICOM IC-705?
« Reply #1 on: November 17, 2022, 07:58:29 AM »
The HM-243 speaker/mic that comes with the radio has an electret condenser mic element, which is what the radio is designed for. You still can use a dynamic mic with it by turning off the phantom voltage (required for an electret element) in the menu. But most likely you'll have to turn the mic gain control to a very high level, which would not be necessary with an electret mic.
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N7LRG

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Re: Use Heil PR-40 dynamic mike with ICOM IC-705?
« Reply #2 on: November 17, 2022, 08:14:07 AM »
Interesting, thanks. The PR-40 is boom mounted so it can be close to my mouth. I do have the EQ plus and 8 band equalizer by W2IHY. I'll chat with him about maybe integrating that to see if it will give the mic some boost.
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K7JQ

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Re: Use Heil PR-40 dynamic mike with ICOM IC-705?
« Reply #3 on: November 17, 2022, 08:34:55 AM »
Using the W2IHY units will probably do the trick for you, boosting the mic's output.
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WA8NVW

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Re: Use Heil PR-40 dynamic mike with ICOM IC-705?
« Reply #4 on: November 17, 2022, 01:07:53 PM »
You could also ask the folks at Heil about recommended parts, cables, and adapters to accomplish your goal. They would know the PR-40 capabilities better than others.
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WA3SKN

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Re: Use Heil PR-40 dynamic mike with ICOM IC-705?
« Reply #5 on: November 17, 2022, 04:09:58 PM »
Your PR40 is a 600 ohm balanced dynamic mic.  The IC705 takes a higher impedance electret mic.
So you will have to arrange for conversion of levels and impedance.  Don't forget the supervision... switching from transmit to receive needs to be addressed.

-Mike. 
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N7LRG

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Re: Use Heil PR-40 dynamic mike with ICOM IC-705?
« Reply #6 on: November 28, 2022, 08:22:09 PM »
Thanks all. Turns out this is a no-go.
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ZS5WC

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Re: Use Heil PR-40 dynamic mike with ICOM IC-705?
« Reply #7 on: November 28, 2022, 11:04:51 PM »
 :)I used the Heil PR781 on my IC7700.
Never worked well, VOX refused to work. Levels are too low.
Dynamics are prone to Humm.

Currently Im running a computer gaming mic that is noise cancelling and very sensistive , but RF immune.
Little chinese mic on mini tripod and foot switch.
Audio is brilliant.

73 de William
ZS4L / ZS5WC
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ZS5WC

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Re: Use Heil PR-40 dynamic mike with ICOM IC-705?
« Reply #8 on: November 28, 2022, 11:24:50 PM »
 :)I used one of these.. and a foot switch.
https://www.amazon.com/-/es/Trust-Gaming-Mico-Micr%C3%B3fono-Soporte/dp/B07LC43PXH?language=en_US

Cut 3.5mm plug off, white center to mic. input and phantom supply, braid to mic. braid.
Foot switch to PTT+ and PTT earth return, NOT MIC BRAID. Must be separate.

73 de William
ZS4L / ZS5WC


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AI5BC

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Re: Use Heil PR-40 dynamic mike with ICOM IC-705?
« Reply #9 on: November 29, 2022, 05:53:29 AM »
Who is Mike?
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N7LRG

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Re: Use Heil PR-40 dynamic mike with ICOM IC-705?
« Reply #10 on: November 29, 2022, 05:35:28 PM »
Haha yeah I typoed that. I was frustrated.
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