RadioReference on Facebook   RadioReference on Twitter   RadioReference Blog
 

Go Back   The RadioReference.com Forums > Commercial and Professional Radio > Motorola Forum

Motorola Forum For general discussion of Motorola land mobile radio equipment and their trunking technologies.

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1 (permalink)  
Old 01-24-2014, 8:01 PM
Member
   
Join Date: May 2011
Location: Wilmington, NC
Posts: 39
Default motorola ht-750 pigtail adapter ??

Hello all.

I have posted before about an issue I have. I participate in SCCA racing, with my brother being a driver, and I am his radio/spotter guy. I do not hear very well, and my problem is not being able to turn my motorola HT-750 up loud enough on my racing mic/headphone headset for me to hear (nevermind the headset, I do not have it on me to give you the brand/model). I finally came across a double a "AA" battery powered, inline 3.5mm headset amplifier. I tested it on my PC and it works amazingly. I am so close to solving my problem, but there is only 1 little thing standing in my way. My headset has the 2 prong head that plugs into my radio. One prong is the mic, the other prong is the headset speakers.

My question is: Is there a flying-lead, or pigtail adapter that will plug into my HT-750 that I can plug my headset's mic prong into, and install this inline amp on the headset speaker side?

Last resort, if I can find a cheap headset like a police one that has the 2 prong head that plugs into my radio, I will cut off the head, then use a voltmeter and identify the wires, then solder some connectors together to make it all work.
__________________
Uniden Bearcat BC350A
Reply With Quote
Sponsored links
  #2 (permalink)  
Old 01-26-2014, 5:02 PM
cmdrwill's Avatar
Member
   
Join Date: Mar 2005
Location: So Cali
Posts: 581
Default

The speaker out put on those radios are NOT referenced to ground. Grounding any of the speaker leads will blow out the audio amp in the radio. So you can not "just hook up an amp".
Reply With Quote
  #3 (permalink)  
Old 01-27-2014, 5:54 PM
Member
   
Join Date: May 2011
Location: Wilmington, NC
Posts: 39
Default

Hello cmdrwill. I am not quite sure I understand what you mean by the speaker output on the radio being not referenced to ground. I have not heard of this term before. Can you please elaborate?
__________________
Uniden Bearcat BC350A
Reply With Quote
  #4 (permalink)  
Old 01-28-2014, 1:45 PM
cmdrwill's Avatar
Member
   
Join Date: Mar 2005
Location: So Cali
Posts: 581
Default

The audio amplifier in most two way radios uses what is called a bridged amp. Each lead of the speaker is driven by the amp, so basically two amps, one for each side of the speaker.

In professional headsets the speaker/earphones are only connected to the audio output on the radio. Totally independent of any ground.

See "Bridged amplifier" section at Bridged and paralleled amplifiers - Wikipedia, the free encyclopedia
Reply With Quote
  #5 (permalink)  
Old 01-28-2014, 9:43 PM
Member
   
Join Date: Apr 2012
Location: Puget Sound
Posts: 710
Default

On the post that you made in Nov 2013 about this same subject, I send you a PM and posted that I did.

I am also into racing and handle many radios, headset, helment kits for racers.

Again, check your pms for am earlyer reply.
Reply With Quote
Sponsored links
  #6 (permalink)  
Old 01-30-2014, 3:56 PM
cmdrwill's Avatar
Member
   
Join Date: Mar 2005
Location: So Cali
Posts: 581
Default

He is going to need a professional headset like fire trucks use. The headset will cost more than the radio.
Reply With Quote
  #7 (permalink)  
Old 01-30-2014, 4:22 PM
Member
   
Join Date: Apr 2012
Location: Puget Sound
Posts: 710
Default

Quote:
Originally Posted by cmdrwill View Post
He is going to need a professional headset like fire trucks use. The headset will cost more than the radio.
That not true if you know where to buy one.

Yes, going to David Clark (starts at $275.00) or Racing Electronics or Racing Radios (also starting about $250) is not the place to go.


I sell high quality industral headsets with the correct radio cable PTT on ear cup starting at $195.

My main supplier for these headsets also supply to hundreds of other radio shops and there are hundreds of these used in the racing industry from road course to off road to boat and motorcycle racing.


intiractive Contact me
Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 10:42 AM.


Powered by vBulletin® Version 3.8.2
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
All information here is Copyright 2012 by RadioReference.com LLC and Lindsay C. Blanton III.Ad Management by RedTyger
Copyright 2011 by RadioReference.com LLC Privacy Policy  |  Terms and Conditions