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Help with motorcycle moble

Discussion in 'Mobile Radio Systems' started by NJ9G, Apr 30, 2012.

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  1. NJ9G

    NJ9G Ham Member QRZ Page

    I have a Kenwood D710 radio and a BMW K-1200LT motorcycle. I would like to start doing some event support with my bike, but I am having a hard time finding the right microphone. I think I can handle getting the radio wired into the bike, power, antenna, etc. But I am not having any luck finding a remote mic/speaker for the D710 than I can integrate with a helmet. It would need to have a good loud speaker, and a remote PTT switch that I can mount on the handlebar. I may just be looking for the wrong thing, so if anyone can help, I would greatly appreciate it.
     
  2. M0GVZ

    M0GVZ XML Subscriber QRZ Page

    Get a headset with a boom mike and make up some cables. You need one with a RJ45 connector on that has a two core wire coming out to a female jack socket for the mike connection of the headset and the other two core wire going to a switch on the handlebar for PTT - both twin cores will need to share the ground wire. Then you just need to make up an extension cable to plug the headphone socket into.

    You could do away with the handlebar switch and use VOX but in a noisy environment it may miskey.
     
  3. K0BG

    K0BG Platinum Subscriber Platinum Subscriber QRZ Page

    I'm not into bike mobile, but I do remember seeing an ad for a headset made to go inside a helmet. There was a PTT switch included.

    One thing to remember if you do use VOX, everyone will know what you think of the guy who pulled right in front of you!
     
  4. NJ9G

    NJ9G Ham Member QRZ Page

    I have seen a couple of motorcycle headsets, but they are made for a two-pin typical style connection. I guess I could get one of those and rewire it for the RJ45 jack on the 710, but I would prefer to avoid that if there is another option.
     
  5. K0BG

    K0BG Platinum Subscriber Platinum Subscriber QRZ Page

    Heck, it can't be that hard to make an adapter. Most of the parts are carried by Mouser.
     
  6. NJ9G

    NJ9G Ham Member QRZ Page

    I hadn't thought of making an adapter, but that seems like a great approach. Then, you could just simply unplug from the motorcycle and plug into an HT, while wearing the same headset.
     
  7. NJ9G

    NJ9G Ham Member QRZ Page

    I tried to wire up an adapter. I got the PTT to work, but I was unable to get any microphone to work. I tried a variety of different mics, but none seemed to drive the audio at all. Is there some trick to wiring microphones to receivers? I'm just wiring the mic to the MIC and MIC GND lines.

    I have also had a hard time finding a Kenwood-style cable adapter. It looks to me like the smaller pin is a 2.5MM mono, but those are suprisingly hard to find.
     
  8. K0BG

    K0BG Platinum Subscriber Platinum Subscriber QRZ Page

    I'd have to look to be sure, but I think all of Kenwood's radios all use a dynamic microphone. I won't say all, but most headsets use an electret condenser microphones, and they need bias power.
     
  9. NJ9G

    NJ9G Ham Member QRZ Page

    This is the wiring diagram for the mic jack. Do you have any suggestions as to how to wire an external microphone to it? I was putting the mic lines across 6 and 5, but not driving anything. I would assume the Kenwood is a basic dynamic microphone. If I want to wire in an electret microphone, where does the bias power come in?

    Microphone.PNG
     
  10. W9GB

    W9GB Ham Member QRZ Page

    Last edited: May 9, 2012
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