HMN1080A extension cable

rolncode3 · Post by **rolncode3** » Tue Jan 23, 2007 8:51 pm

Have a Spectra C7 remote-head mounted in the headliner of a patrol vehicle (not the greatest setup, but trying to make it better). The microphone model # is HMN1080A.

I would like to run the cable down the doorpost and have the mic cable come up from the floor, not down from the roof. Would need approximately 10-15 foot extension.

Anybody that can manufacture this? Sorta' on the cheap? Otherwise I was just going to splice in a cable...anybody know of good cable for this? I know the connector has six pins, so it would need to work for that.

Any ideas, or help, would be most appreciated. I searched and found a similar thread, but it was kinda' old...

Post by **akardam** » Tue Jan 23, 2007 10:30 pm

I'm not sure there's any OEM solution to that particular problem. I suppose if I was going to do it, I'd get a Maxtrac or other RJ45 jack mic, take the Spectra style cable from your mic, and splice in an ethernet cable to it with an ethernet jack on the other end to plug the Maxtrac-style mic into. Would make it at least a bit modular.

Then again I'm not sure how far you'd be able to extend the mic cable before things started freaking out.

Will · Post by **Will** » Tue Jan 23, 2007 11:17 pm

Accually for the Spectra you only need four wires, two are twisted and shielded in the main cable from the head to the radio.

MIC HI )
MIC LO Shield ) twisted
PTT
HUB

On the A5 and A7, you can use pins on the DB 9 connector near the head for the mic, but jumpers are needed in the control head to do this.

techie · Post by **techie** » Wed Jan 24, 2007 12:57 am

On the mid power versions, you can get most of the pins (except HUB) from the DA15 connector. It also looks like you can get them from the second DB25 on the remote interconnect board, if the appropriate jumpers are installed.

I would run a shielded cable from your chosen interconnect point, and put a 8position modular connector (commonly, and incorrectly referred to as RJ45), and use a maxtrac mic. Either that,
or cut the connector off a mactrac mic, and use a neutrik or switchcraft XLR type.

I have seen setups with dual microphones, but haven't been able to look at them up close.
A local PD has a mic on the passenger door for the second officer. I'm assuming it's for the
radio, and not for the PA.

rolncode3 · Post by **rolncode3** » Wed Jan 24, 2007 2:59 am

OK, adding the 8 position connector to run a Maxtrac seems like a reasonable setup. The radio shop has plenty of extra mics around...they might even have the type I need.

Question would be:

Which wire on the Spectra would go to which pin on the 8 position?

AEC · Post by **AEC** » Wed Jan 24, 2007 9:32 am

As for the Maxtrac setup goes, the older AC250 style installation kit for the 'bag phones' Circle-M used to offer had just such a cable for remote mounting of the phone transceiver, yet still able to locate the handset in a safe, unobstructed way.

Second hand stores probably still have a good supply, like Goodwill or Salvation Army and the like.

It does work with the Maxtrax, GTX and others.

I just recently used the one I have for a remote mic on my GTX, and everything functions fine.

I don't have the part number available as mine has been 'debagged' for close to 10 years now.

In fact, I'm going to hit these same stores next time I'm in the Mesa area as main street is loaded with them.

BTW, the cable is flat, 8 conductor also, with the male end and a large female coupler for the mic, which has two holes on the side for mounting it to some 'hidden' location underneath the dashboard so all you see is the handset and nothing else.