Philippe Baudouin's AM/FM/Weather Radio/CD Install
For more information contact Philippe at: philb1@sympatico.ca

The radio unit is designed by Heavy Duty with the original target market being the farming equipment. It is very rugged and waterproof with a removable wired remote control. I purchased it on the web from Hoppe Industries who have used this unit in their audio system for Harleys. See http://www.hoppeindustries.com/  . I had excellent service from them and would have no problem recommending a web purchase from this company.

 The unit is capable of 100W of audio but this is mostly overkill since I use helmet speakers. It has AM/FM/Weather bands, with 5 preset channel buttons that can select up to 10FM, 5AM, and 5 Weather Band stations. Controls for channel searching ( SEEK), bass, treble, balance are also included on the remote control unit.

On the ST1100, the installation is quite simple if the bike is also equipped with the ST1100 Honda backrest. The radio unit fits neatly in the backrest pouch. Two of the units mounting holes line up exactly with the screws used to attach the pouch. You need to drill two additional holes in the mounting flanges of the radio unit to match up with the other two screws retaining the pouch.

The remote control unit is installed with two screws and nuts which go through the plastic cover of the handlebars. A template is provided to best locate the screw holes. The flat cable for the remote control goes through the enlarged hole behind the Honda logo on the handlebars. If you decide to sell the bike without the radio, just put the Honda logo back on and you will only have two small screw holes as evidence.

 The headset mini jack was purchased at a local electronic store and installed by drilling the appropriate hole on the left side fearing. In the same  area, a second mini jack is also installed to accept the CD audio input. A short male to male stereo mini jack cable was made to connect the CD to this audio input jack that is wired back to the radio unit.

The radio unit is designed to accept a specific cassette unit which is wired to the radio unit via an eight pin female DIN connector on the radio unit. The remote control is also designed with the ability to control this cassette unit. A male 8 pin DIN connector can be purchased at most electronic stores to allow connection to the radio unit. The audio output of the CD unit is wired to this 8 pin DIN in order for the audio of the CD to be managed by the remote control and amplified by the radio amplifier. For this to be possible, the radio unit needs to be informed that the CD is present before it will switch its audio source from radio to CD. This is done by using a normally open pushbutton wired between pin 3 and pin 1 of the DIN connector. It works better if a 1K Ohm resistor ( the value is not critical 1K to 10K will do) is used in series with pin3. I installed the pushbutton on the left side fearing near the headphone and CD input jacks and brought the wires back to the DIN connector. It sometimes takes a few pushes on the button to have the radio switch and latch into CD mode. A subsequent push of the button will switch the unit back to radio mode. Audio channels 1 and 2 ( left and right) from the CD are wired to pins 2 and 8 of the DIN connector. Pin 1 is the common or ground.

A Word document with the cable pin out diagrams is available by clicking here: