Nokia 8110 Installation Instructions Manual page 13

After Sales
Technical Documentation
After drilling the hole for the antenna remember to clean the hole from the dril-
ling swarf, so that surface is even. This is needed in order to ensure proper and
reliable connection between the ground plane and the antenna. After cleaning it
is advised to apply some rust–proofing compound to the hole.
Mount the base of the antenna tightly to its place. Consult the antennas manu-
als for determing the maximum bending angle before attempting any bending
operation.
To avoid drilling a hole in the vehicle's bodywork, a glass–mounted antenna can
be chosen and located on the rear window of the vehicle.
Try to route the antenna cable so that possible sources of disturbances are
avoided, as well anti–skid brake systems. The shorter the antenna cable, the
smaller the attenuation, and the better the performance of the antenna. The an-
tenna coupler should always be connected to the antenna via a non–radiating
cable (e.g. coax).
Most of the antennas today have adapted the minigrimp connector system
which eliminates the need for special grimping tools and connectors. If however
the purchased antenna has traditional connectors, use only proper connectors
and tools. The antenna coupler uses TNC–female type antenna connector for
reasons of reliability and attennuation.
Ignition Sense IGNS
The ignition sense feature prevents your car kit from draining the car battery by
executing an auto power off in 20 seconds after the ignition key has been
turned off. The blue wire of the power cable is used for the ignition sense fea-
ture. The use of ignition sense is recommended to prevent accidental draining
of the car's battery. The wire is connected via a 1 A fuse to a 12/24 volt poten-
tial that is controlled by the ignition key. Do not connect it directly to the high
voltage sections of the ignition circuit.
Car Radio Muting CRM
The car kit offers a feature that can mute the car radio automatically during a
conversation. This feature is convenient and provides for safer handsfree op-
eration. The car radio muting feature is based on a grounded line, so it means
that in standby, the yellow wire (XCRM) is not grounded and car radio works
normally, but during a call, line is grounded and car radio is muted. Note that
an auxiliary relay or muting unit must be used when the car radio doesn't have
a mute feature available.
When a relay is used, connect in series with the car radio main supply. A
200 mA fuse should be used to protect the XCRM output in event of a short cir-
cuit. Some radios have separate supplies for amplifiers and motors, and anoth-
er for memory backup purposes. Very often these radios also have a secret
code system, which activates itself if a break in the memory supply is detected.
Be careful when installing the relay not to break the memory supply (usually
marked ACC or +MEM), but to install the relay in the main supply feed.
Original 18/96
Installation Instructions
Page 13