> MARC Newsletter: February 1996
by Burt Wagner WB9ZRA
WHAT I WANTED TO DO:
Install my 2-mtr radio on my 1990 GL-1500
in such a way as to keep it weather/theft protected, yet allow easy operation
from my handlebars. Incorporate the up/down/ptt switches on my stock Honda CB to
work with my 2-mtr radio keeping each operating independently of each other
while simultaneously allowing audio input from both into existing stereo system
on the motorcycle. Since I always wear a helmet I only cared about audio in/out
in this mode. There is no reason you can't replace the 2-mtr radio with any
other transceiver or CD player, etc.
At a GWRRA meeting I attended, I was introduced to Robert Chamberland who had
done a similar setup on his bike. Bob had taken the time and figured out the
pin-out of the stock CB connector, and his documentation makes it all possible.
A friend of mine Gary Robin, K9HDU helped with the schematics.
HOW I ACCOMPLISHED IT:
On the left handlebar there is a cover, and under this cover the up/down/ptt
wires can be accessed. Green & white wires are the PTT and Grn-Orn-Gry are
the channel up/down wires. I extended these wires to the right (locked) faring
pocket, installing a switch to change between the two radios. I then soldered
two pieces of tiny coax to the harness connecting the CB radio to the stereo on
the bike. One piece to pins 7 and 15, then went to the mike input on my 2 mtr
radio. The other from pins 5 and 14 went to the external speaker jack of my
2-mtr radio. Be careful of the harness. It's about $50 if you screw up. Mounting
my ICOM 229A in a custom plastic mounting bracket in the faring pocket, I was
then able to relock the cover. At the same time I mounted the switch next to the
radio on the same mounting plate. Out of sight, out of mind and sort of weather
That's all there is to it, and best of all it works!
If you want to have the audio come over your stock speakers instead of the
helmet connect a wire to pin 12. When grounded your bike speakers are active.
When open your helmet speakers are active.
Starter/Float When Running
Pins 5 and 14 used together connect to
external speaker of 2-mtr radio (audio Out 2-mtr.)
Pins 7 and 15 used together connect
to mike input of 2-mtr (audio IN 2-mtr.)
If you don't have a factory CB installed, you can buy from Radio Shack
their "Honda Accord Stereo Connector", P/N 12-1379. Cut out one
pit and mate directly with the stock CB/radio harness.