Interfacing a Ham radio to the Goldwing 1500 sound system I own a 1995 Goldwing 1500 and a D700 and I wanted to join both hobbies. I have the audio coming out of the speakers or the head set with a switch located inside the left pouch “See S1” and the microphone from the head set can be used for the CB or ham radio by switching S2. I normally have the audio of the D700 coming out the head set as to have it mute the FM radio it would require getting a COS out of the D700, that’s another project for next winter. Layout on the Bike Switches inside left cubby hole for mic and speaker I had intended on using the same PTT for the CB and D700 but that was too much a big deal same as using the Up/Down channel selector for the CB. I found on the internet a simple adaptor to fabricate for the PTT . I used a simple NO push button and some shrink tube for a clean finish. See the red button to the left of the horn? Looking up, Looking between the clutch lever and left grip. I love Velcro and use it to secure the D700 display that I can view at a quick glance , I did fabricate a new patch cord between the radio and the display. This way I can quickly relocate the radio to another vehicle if the need arises. The audio and microphone need to be isolated from the radio and the bike, for this I used simple 600: 8 ohms Audio transformer and a 1:1 Audio transformer. They cost about $3 each. To keep the purchase of component and parts simple I passed 3 “shielded cable” from the rear of the bike to the front counsel, one the mic, one for the speaker and one for the PTT. These are small wires used for stereo headset or microphone, the shield was grounded to a good ground and the 2 small wires are used to transport the signal. The PTT cable I routed to the left handlebar and the 2 others under the left pouch above the CB. They ended up in the center trunk, I had to drill a 3/8 inch hole in the lower left behind the passenger back rest where I wired the power also. This is the mess of wires under the cubby hole. Notice all the ferrite beads, When the D700 beacons my position or I talk there is interference coming over the FM radio audio. The beads help but I have not totally eliminated the noise. The noise is their when the bike is in motion only and I am trying to avoid cutting the speed sensor going into the radio as the AVC is a cool feature, I might add another switch to only cut it out only when I want to transmit on the ham band . The wirering diagram, The PTT wires are connected from the momentary SW to the PTT wires in the mic plug. The mic in wires are connected from the mic plug to the 1:1 transformer input and the output is connected to a shielded cable going to the front of the bike’s S2 then to the shield and center conductor of the larger blue wire on the CB radio plug. The speaker out of the radio is connected to the 8:600 transformer input and the output is connected to a shielded cable going to the front of the bike’s S1 common contact and the other wire is connected to the pink wire on the CB radio plug. The outside contacts on S1 are connected to the Black and Pink wires respectively on the CB radio plug Conclusion, If I wish to use the IRLP or autopatch I do need to disconnect the above wirering to the mic plug and plug in my DTMF mic to enter the digits, another winter project “to make this simpler”. I wired the antenna thru the trunk lid with an NMO mount, I am considering relocating it to the metal luggage rack above the break light bar and using the luggage rack as a ground plane, this also moves the Ham antenna further away from the FM and CB bike antennas. I have seen an antenna that was mounted on a home made steel bracket between the back rest and the fiberglass of the trunk, the problem with this is that all 3 antennas are really close together, though it makes for a real clean look. Any comment or suggestions are welcomed at ve7mmg at rac dot ca