User's Manual

INSTALLATION
FIXED STATIONS
ENVOY™ TRANSCEIVER REFERENCE MANUAL 381
Related links:
Earthing the antenna on page 378
Earthing the tuner on page 379
Earthing the transceiver in a fixed station on page 374
Testing the installation
Following correct installation, the station should be tested for correct operation prior
to use in the HF communication network.
Testing involves:
• measuring the SWR
• carrying out station-to-station on-air testing
SWR is bad The SWR
measurement may
have been performed
at the RFU rather
than at the antenna
Ensure the SWR meter is connected to the coaxial line at
the base of the antenna to achieve an accurate reading.
The antenna may not
be positioned
correctly
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.
Faulty coaxial cable
or control cable
Replace faulty cables.
The antenna and/or
tuner may not be
earthed correctly
Improve the earth connection.
Antenna detunes Inadequate support
of the antenna
Ensure the antenna has adequate support so that it does
not sway or sag. If required, use antenna supports such
as guyed masts.
Table 39: Possible faults in the fixed antenna installation (cont.)
Symptom Possible cause Action