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Motorola HNM3596A Conversion to 4 PIN???

Microphone Information Wiring etc, or if you just need help with choosing a good microphone for your radio.

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Scipio Kid
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Motorola HNM3596A Conversion to 4 PIN???

Post by Scipio Kid » Tuesday, 01 August 2017, 12:37 PM

Hey all,
I've found, as I'm sure many others have, that mics don't always last, especially when they get beat up. I checked out a Radio Shack sideband that seemed to work but never got a response. I pulled the mic off another realistic and plugged it in and the radio worked great. The first mic simply had no modulation. In testing, I found I had 6 or 7 of those Realistic mics kicking around but was surprised when I tested them and found only the one worked great, with good, clear modulation, 2 others worked good but were quiet on the other end, sounded like they needed a boost, and the others were all dead, the radio transmits but there is no modulation. Seems like a problem with those old RS mics. I haven't gotten into trying to fix them because I really don't use them much but it'd be nice to know if there are any quick fixes since they're a lot less common than the typical 4-pin mics.

Anyway, I ended up testing a few other mics too and have quite a few 4 pin (Cobra / Unidan / Galaxy / others) that don't perform well. Some are low output, like the RS's, some are real scratchy, like the switch contacts are dirty or shot and some are damaged, cracked or broken from misuse or neglect but still might be fixable.

Now, I also have 2, brand new Motorola HNM3596A microphones that seem to be good quality (better than the standard Cobra) but have the "phone type" plug-in connector for the Motorola radio. I cut the plug off the one and found six leads in there, black, blue, red, green, white and yellow. I did a little figuring and tried to hook it up to a Cobra and ended up trying a million combinations and had no luck at all making it work. I looked up the mic and some wiring diagrams on the web and that really got confusing.

So .... anyone here got a good idea how I might get these mics wired to work with a 4-pin Cobra or Uniden? I'd rather use these than fix the broken ones.

Thanks,
Scipio
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MDYoungblood
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Re: Motorola HNM3596A Conversion to 4 PIN???

Post by MDYoungblood » Tuesday, 01 August 2017, 16:31 PM

I might be mistaken but I think your out of luck at just direct wiring them for Cobra, I believe they have a electret mic element that will need a power source to drive it. Sometimes it's more than just getting the wiring right. I looked for a schematic for just that model mic and couldn't find one.

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Scipio Kid
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Joined: Monday, 18 July 2016, 7:31 AM
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Location: Out West in Herriman

Re: Motorola HNM3596A Conversion to 4 PIN???

Post by Scipio Kid » Wednesday, 02 August 2017, 7:19 AM

OK, that wasn't the answer I wanted. You were supposed to say, just hook it up any which way and it'll work great.

On the bright side ... I have two really nice Motorola Microphones for sale cheap. Some idiot cut the plug off one of them but, for the right person, I'd be happy to get some big wire nuts and a roll of Scotch 33 and fix it up for you.

Thanks Greg. It's more than kind of you to spend your time figuring out something I'm apparently incapable of figuring out (yet again).
Happy Trails



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MDYoungblood
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Re: Motorola HNM3596A Conversion to 4 PIN???

Post by MDYoungblood » Wednesday, 02 August 2017, 8:11 AM

Well you could change the radio's jack to a 6 or 8 pin and make one an 8v source off the PCB, hopefully it is an older radio that the jack isn't mounted on a board.

3's

Greg
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"321, the Middle of Maryland"

23 AM "WORLD Image WIDE" 38 LSB

Strong Supporter of America's Original Homeland Security Act
The Second Amendment


Base
Uniden Washington
Mobile
Texas Ranger TR-696FD1C
Handheld
Maxon HCB-40WX
Antennas
Avanti Sigma II
Homemade Full Wave Loop
Homemade 1/2 wave Dipole
Hustler 102" SS Whip and Hustler Ball Mount

Official Moderator - CBRT Complaint Department




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