INSTALLATION
MOBILE STATIONS
ENVOY™ TRANSCEIVER REFERENCE MANUAL 401
Antenna fails to tune
certain channels
The antenna and/or tuner
may not be earthed
correctly
Improve the earth connection.
Ensure a good earth connection to the vehicle
body is provided by an earth braid or copper strap,
keeping it as short as possible.
Check the vehicle earth on metal areas close to the
antenna and rectify if necessary, for example, the
bonnet of the vehicle may be isolated from the
main vehicle earth.
If the problem persists, shorten or lengthen the
coaxial cable between the antenna and the
transceiver by approximately 1 m (1 yd).
Check that the problem does not move to other
channels.
The antenna may have
been tuned without the
whip in place
Ensure the whip is in place before tuning.
Poor radiation
efficiency
Poor installation Improve the earth connection.
Incorrect positioning of
the antenna
Check the position of the antenna, ensuring that
the vehicle body is not acting as a shield.
With an SWR meter in place, alter the position of
the antenna to achieve best forward-radiated
power.
Check that the problem does not move to other
channels.
The antenna and/or tuner
may not be earthed
correctly
Improve the earth connection.
Table 35: Possible faults in the mobile antenna installation (cont.)
Symptom Possible cause Action
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