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Thread: Help with motorcycle moble

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  1. #1
    Join Date
    Apr 2012
    Location
    Austin, TX
    Posts
    17

    Default Help with motorcycle moble

    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. #2
    Join Date
    Sep 2009
    Location
    Driffield, East Yorkshire, England
    Posts
    1,527

    Default

    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. #3
    Join Date
    May 2001
    Location
    Roswell, NM DM73
    Posts
    2,590

    Default

    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!
    Alan Applegate, KBG
    [URL="http://www.k0bg.com"]http://www.k0bg.com[/URL]

  4. #4
    Join Date
    Apr 2012
    Location
    Austin, TX
    Posts
    17

    Default

    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. #5
    Join Date
    May 2001
    Location
    Roswell, NM DM73
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    2,590

    Default

    Heck, it can't be that hard to make an adapter. Most of the parts are carried by Mouser.
    Alan Applegate, KBG
    [URL="http://www.k0bg.com"]http://www.k0bg.com[/URL]

  6. #6
    Join Date
    Apr 2012
    Location
    Austin, TX
    Posts
    17

    Default

    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. #7
    Join Date
    Apr 2012
    Location
    Austin, TX
    Posts
    17

    Default

    Quote Originally Posted by K0BG View Post
    Heck, it can't be that hard to make an adapter. Most of the parts are carried by Mouser.
    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. #8
    Join Date
    May 2001
    Location
    Roswell, NM DM73
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    2,590

    Default

    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.
    Alan Applegate, KBG
    [URL="http://www.k0bg.com"]http://www.k0bg.com[/URL]

  9. #9
    Join Date
    Apr 2012
    Location
    Austin, TX
    Posts
    17

    Default

    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. #10

    Post

    IF you are using an Elecret microphone, then powering is described here:
    Powering microphones
    Copyright Tomi Engdahl 1997-2012
    http://www.epanorama.net/circuits/mi..._powering.html

    2.5 mm and 3.5 mm plugs are very. COMMON at Radio Shack, Mouser and Big Box
    stores that carry parts for personal audio equipment.
    KNOW if you need the Mono, Stereo, or 4-conductor version
    http://www.mouser.com/MobileCatalog.aspx?page=1341
    Last edited by W9GB; 05-09-2012 at 06:54 PM.

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