User Guide

Installation Instructions
NHB–3
Technical Documentation
PAMS
Original 26/97
7
Positioning
The best guide for positioning the units is your own experience, skills and com-
mon sense. However, some aspects requiring special attention will be dis-
cussed here.
The positioning of the holder unit is the most important factor when trying to
achieve the most comfortable usage for the user. The location of the holder unit
should be selected so that the visibility of the phone display is good in every
lighting condition, but not so that the drivers attention gets too easily stolen
from driving itself. The holder unit should be located so that the driver can easi-
ly reach the keypad. Under no circumstances should the holder unit obstruct
the driver from operating car controls (i.e. handbrake, etc.).
If handset is used like a phone & a holder unit, the handset’s place should be
located according same rules as holder unit is located. If using handset, the
location of the phone is not so critical. In this case location of the phone is de-
termined by the connecting cables and the the obtainable of the phone.
Junction box can also be installed in hidden location, since usually there is no
need to detach cables in normal operation. Remember allthough that the box
doesn’t like moisture or mechanical pressure.
Handsfree microphone can usually be installed in the sunvisor of the driver, or
in the A–pillar. The main idea is to get the microphone quite close to the drivers
mouth, and also to attach the microphone in surface that doesn’t carry the me-
chanical vibrations of the car body, since these will increase the background
noise when using handsfree.
The loudspeaker isn’t so sensitive for vibrations, thus it can be located more
freely. The main idea is to optimize two requirements: The driver should hear
the signal from the loudspeaker without any special efforts, but the the attenua-
tion between loudspeaker and microphone should be as high as possible, i.e.
they must ”look” in other directions in order to minimize the acoustic feedback.
The system cable routing isn’t usually critical; however it should not be routed
next to electronic ignition systems or ABS braking systems wires or boxes to
prevent interference to important automotive electrical components. Take also
care not to run the cable so that it’s gets under any mechanical stress e.g. un-
der seats or against sharp edges of car chassis.
The customer is paying for the installation and expects to get a very good re-
turn for his money. Therefore installers first duty is to discuss all the locations
with him/her. Sometimes the customers may have starnge ideas of the loca-
tions. Then it is your job to point out politely why these solutions won’t work.