Fitting the headset parts to your helmet
Speakers
– Carefully fit the speakers inside the helmet so that they align exactly with your ear canal.
The Velcro should stick to the helmet lining or if not you can glue or stitch the Velcro loop fabric in place.
Microphone (Full face helmets)
– Fix the microphone on the inside of the chin guard of the helmet.
The microphone MUST NOT be more than 1cm from your lips.
Microphone (Open face)
–
Shape the microphone arm base to the shape of the helmet. Make sure that
there are no gaps between the microphone arm base and the helmet. Wipe the microphone arm base with
a cloth to remove any dust and make sure that the helmet is clean. Fasten the microphone arm base in
position on the helmet using the adhesive pad provided. The microphone MUST NOT be more than 1cm
from your lips. For right hand drive cars make sure that the driver’s microphone is fastened to the left
side of the helmet and the co-driver’s microphone is fastened to the right. (vice versa for left hand drive
cars).
All headsets IMPORTANT
–
The white clip should be fastened to the side of the helmet to alleviate
strain on the cables. If not used, premature failure of the headset may occur.
Fitting the Terraphone
Amplifier Unit
–
Mount the Terraphone amplifier between the driver and co-driver in a position so that
cables to the headsets do not obstruct operation of the vehicle and are kept clear of the steering wheel.
The unit should be fastened to a solid surface with the fixings provided. Connect the red wire to +12 volts
positive and connect the black wire to the battery negative. NOTE: It is recommended that both the red
and black wires are connected directly to the battery terminals to avoid interference and the cables
should NOT be run together with other vehicle wiring. Avoid proximity to pedals and other moving parts
and use cable grommets to avoid chaffing where cables pass through the bulkhead. You must fit the fuse
in the positive lead, directly after the positive terminal.
The amplifier must only be used on negative
earth cars.
Using your Terraphone
Power switch
–
The right hand switch on the Professional model switches the unit on and off, push to
the left to switch on.
Volume controls
–
The right side volume control effects the overall volume to the right user and the left
volume control effects the overall volume to the left user. Set these controls individually to give a
comfortable level.
Automatic Volume Control
– The Terraphone Professional is equipped with an automatic volume
control or “limiter”. This will raise normal speech levels to a constant level and prevent excessive volume
in the headset. This can be disabled if not required by switching off the DIP switch marked LIMITER on
the rear panel.
Noise Reduction
-
The Terraphone Professional is equipped with a noise reduction system that will
eliminate amplification of background engine noise. The threshold at which this discriminates between
background noise and your voice can be adjusted with the control on the rear panel marked NOISE
REDUCTION. Rotating this adjuster clockwise will require a higher speech level to activate the
microphone. Noise reduction can be disabled if not required by switching off the DIP switch marked N/R
on the rear panel.
Radio connection / Level setting
–
The 3.5mm jack socket on the back of the amplifier marked RADIO
can be connected to the output of your 2-way radio. (auxiliary radio leads can be purchased from
Terratrip or your local dealer). On this model the audio from the radio can be switched off when the left
switch marked “RADIO” is moved to the left. Adjust the amplifier for normal operating levels and then
set the radio volume control to give the required receive level in the headsets.
