Installing The Antenna - Codan Envoy Reference Manual

Table 34: Possible faults in the mobile installation (cont.)
Symptom
Control point
disconnects from
RFU
Related links:

Installing the antenna

WARNING: The antenna should be installed by a suitably qualified technician, to
NOTE:
Positioning the antenna
For information on positioning a mobile antenna, see the documentation provided
with the antenna.
E ™ T R
NVOY RANSCEIVER EFERENCE
Possible cause
Inadequate earthing of the
antenna
Inadequate earthing of the
RFU
Control point cable is not
separated adequately from
antenna control and
coaxial cables
Radiation safety (non-EU installations) on page 472
Radiation safety (EU installations only) on page 470
Earthing the antenna on page 400
Standing wave ratio on page 405
Earthing the transceiver in a mobile station on page 397
the relevant standards and approvals.
Correct installation of the antenna provides efficient operation over the
frequency range of the transceiver. It ensures the antenna provides
maximum output power during transmission and clear reception of
weak signals.
M
ANUAL
Action
Antenna mounting bracket should be welded or
bolted directly to the chassis.
All paint should be cleaned from mating surfaces.
The earth braid provided should be connected to
an independent earthing point going to the
bodywork of the vehicle, or to the battery negative
if possible.
Improve the earth of the transceiver by connecting
an earth strap (braid or copper strip) from the earth
screw of the transceiver to the earth point, keeping
the strap as short as possible.
Separate the control point cable from the antenna
control cable and the antenna coaxial cable by at
least 200 mm (8 in), except over short distances
where they may pass through the same hole in a
bulkhead.
I
NSTALLATION
M
OBILE STATIONS
399