TerraPhone - Fitting and Operating

Headset Speakers – Carefully fit so that the speaker is exactly opposite the ear. The Velcro usually adheres to the helmet lining. If not, sew or glue the loop Velcro to the helmet lining. I prefer my speakers behind the lining of my helmet as it is more comfortable on my ears. Experiment to see which you prefer.

Headset Microphone – Full Face Fix the microphone in position using the Velcro already fastened to the microphone pouch. The microphone MUST be no more than 1 cm from your lips.

Headset Microphone – Open Face Shape the microphone arm base to the shape of the helmet taking care to ensure that there is no gap between the microphone arm base and the helmet. Wipe the microphone arm base with a damp cloth to remove any dust. Also clean the area of the helmet where the microphone is to mount. Fasten the microphone arm base in position on the helmet using the double sided adhesive pad provided. The microphone MUST be no more than 1 cm from your lips. The driver's and Co-driver's microphones are fitted on the side of the helmet toward the inside of the vehicle for convenience in connecting to the amplifier.

All Headsets – IMPORTANT – The white clip should be fastened to the side of the helmet to serve as a strain relief for the headset cables. If it is not used, premature failure of the headset is a certainty. Also insure that you always UNPLUG the headset from the amplifier before exiting the car. Failure to do so will result in premature failure of the headset.

Amplifier – Connect the red wire to a source of +12 volts and connect the black wire to battery ground. To minimize ground or power loop static from noise sources in the car, route the power cable well away from any other wires and connect direct to the battery. Fuse the positive lead directly after the battery.

Radio Input Socket – The input socket on the back of the Club amplifier can be connected via a 3.5mm jack plug to the loud speaker output of your VHF/CB. On the Professional Model, the radio loudspeaker can be connected via the 7 pin DIN socket using the optional Pro Radio Controls wiring harness. With the intercom volume set for normal operation, adjust the radio volume to give the desired volume on the headsets. On the Professional Model, the radio input can be switched off/on using the switch marked RADIO.

Audio Output (Professional Only) – The 3.5mm socket on the rear of the unit is provided as an audio input to a video camera or tape recorder. The voices of both crew members will be recorded. If a radio is connected using the Radio Controls harness, the radio conversation will be recorded as well.

Two-way Radio Interface (Professional Only) – It is recommended that a competent Radio Engineer perform this installation. Included with the PRO Radio Controls harness is a pushbutton and cable to be connected to the pins on the radio which are normally connected to the Push-To-Talk switch on the radio microphone unit. The wire marked ‘Microphone' is connected to the pins normally connected to the microphone of your radio. The wire marked 'Loudspeaker' is connected to the loudspeaker output socked of the radio. When all connection have been checked and polarities verified, plug the 7 pin connector into the socket on the PRO Amplifier. Press the PTT button to transmit to another radio and adjust the small potentiometer on the rear of the amplifier until the best sound reproduction is obtained.