Preparing the transceiver for use
40 Manpack Transceiver 2110 series Reference Manual
Testing the installation
Following correct deployment, the station should be tested for correct operation prior to
use in the HF network.
Testing involves:
• measuring the SWR
• carrying out station-to-station on-air testing
Standing wave ratio
The 2110 series Manpack Transceiver measures the forward and reflected powers
between the transceiver and its antenna load, and represents these in a ratio called the
SWR. To ensure correct installation, the power and SWR assessment should be
performed with the transceiver working in its normal antenna system. Press TUNE to see
the SWR, then press PTT to manually tune the antenna.
If the impedance of the antenna is equal to 50 , no power is reflected. This is the ideal
situation, which gives an SWR reading of 1:1. An SWR equal to or lower than 2:1 is
acceptable. If the SWR is greater than 2:1, the ALC circuitry in the transceiver reduces
the output power. With some combinations of frequencies and antenna design, it may not
be possible to achieve the desired value on all channels.
Using SWR to test the transceiver
To test the transceiver:
1 Select the highest operating frequency of the transceiver.
1 Press TUNE.
1 Press PTT to tune the antenna.
If the antenna length and ground parameters are within satisfactory operating range,
tuning will be successful and the SWR reading will be less than 2:1.
1 Select the lowest operating frequency of the transceiver, then repeat the test.
1 If a particular channel frequency does not tune, check the:
• length of the antenna (for long wire antennas)
• effectiveness of the grounding system
• orientation of the antenna
Alter these slightly in an attempt to achieve better tuning.
CAUTION The SWR should never rise above 2.5:1.
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