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Homemade
CB Intercoms Section
(Page 2)
Note
that this worked really good for me, with my setup. We have a 1982 GL1100
Interstate, and I mounted the CB and the 4PDT Switch in the left side of
the fairing inside the cover plate. Some of the ways I did mine may or
may not work in your case, and you will have to use a little ingenuity
to make it work, but the end results in my case, were as near a factory
look as can be. Not only did this setup really work, it looked nice, and
the headsets turned out to have a "factory look." (I'm a perfectionist
of sorts, and did not want to cheapen the looks of the helmets or the bike.)
I haven't
totally figured the cost, but after spending $25 for a good used CB, and
everything I bought to put this together, I would guess that I have between
$125 and $150 tied up in this setup.
One
more note.......If you don't think you can do this, DON'T! This took a
lot of time, and a lot more trouble than I ever imagined......finding the
right parts that would work out right, putting it all together, plus having
a little of basic knowledge of electricity helped a lot. This information
is only intended as an example of how mine worked, and you will probably
have to modify these instructions to work with your bike and/or CB Radio.
Below is a wiring diagram that I made up to go by in setting up the microphones in this intercom system, using a mobile CB Radio.
The speakers are not shown in this diagram, but are fairly simple to hook up. Simply hook a mono plug cord in the speaker jack on the back of the CB, and hook the two wires from it to the driver and passenger cords on the bike, and hook the speakers in the helmets to the matching pins in the plug-ins to the bike.
NOTE: This wiring diagram works with the microphone that goes with my CB, and will most likely be different than yours. You will have to dissassemble the original microphone for your CB and figure out which wire is doing what. Your mic will probably have a double pole double throw switch in it, and if like mine, when pushed, it will break contact with one wire on one pole, while making contact to the mic. On the other pole, mine only made contact with another set of 2 wires which puts the radio in transmit mode.
I could not find a momentary double pole double throw switch that I could mount in a project box, so in the diagram, on the 4 pole double throw switch I used jumpers on the intercom side of the circuit to keep the radio in transmit mode at all times while in "Intercom Mode". However when the 4 pole double throw switch is switched into CB mode, you will definetely need a remote momentary double pole double throw switch in order for it to work right. Note also that in "Intercom Mode" I am setting the CB in "PA Mode", so it doesn't matter for the transmit wires to be closed at all times.
Since a momentary double pole double throw switch which can be mounted in a project box seems to be impossible to find, I have been thinking about the possibilities of using a plain 2 wire switch with a couple of relays to do the switch. If I find that this can be done to finish the CB Mode side of the system, I may change the wiring for the Intercom Mode as well. Just something to think about.
Here's the diagram:
