Codan Envoy Reference Manual page 441

Table 38: Possible faults in the fixed antenna installation (cont.)
Symptom
SWR is bad
Antenna detunes
Control point
disconnects from
RFU
Related links:
E ™ T R
NVOY RANSCEIVER EFERENCE
Possible cause
The SWR measurement
may have been performed
at the RFU rather than at
the antenna
The antenna may not be
positioned correctly
Faulty coaxial cable or
control cable
The antenna and/or tuner
may not be earthed
correctly
Inadequate support of the
antenna
Inadequate earthing of the
antenna
Earthing the antenna on page 416
Earthing the tuner on page 417
Earthing the transceiver in a fixed station on page 413
M
ANUAL
Action
Ensure the SWR meter is connected to the coaxial
line at the base of the antenna to achieve an
accurate reading.
Check that the position of the antenna corresponds
to the desired direction of communication. The
antenna must also be positioned away from trees,
buildings etc, which provide a shielding effect and
diminish the efficiency of the antenna.
With an SWR meter in place, alter the position of
the antenna to achieve best forward-radiated
power.
Replace faulty cables.
Improve the earth connection.
Ensure the antenna has adequate support so that it
does not sway or sag. If required, use antenna
supports such as guyed masts.
Improve the earth connection.
I
NSTALLATION
F
IXED STATIONS
419