Reference - Kenwood TS-850S Instruction Manual

8. REFERENCE
8-1. ANTENNA INSTALLATION
•Fixed Station
For HF fixed-station operation, an antenna
specifically designed for amateur operation is
recommended. Antenna types include wire antennas,
verticals, rotary beams, and other antenna types.
{Fig. 8-1) HF antennas are quite large and must be
installed to withstand strong wind, heavy rain, etc.
Any antenna used with this transceiver should be of
50-ohm impedance and should be connected using
an appropriate coaxial cable such as 5D-2V (RG-
8/U).
Impedance matching is important. Impedance
mismatching will result in a high VSWR and power
loss, or can cause unwanted harmonic radiation and
interference (TVI, BCI).
The impedance match can be checked with the
SWR meter. Generally, satisfactory operation is
assured when the VSWR (Voltage Standing Wave
Ratio) is less than 1.5 : 1.
Fig. 8-1
_ /
..........,
-
Ground plane antenna
Dipole antenna
A rotary beam antenna is very effective for OX
communication in the 14, 21 and 28 MHz bands.
{Fig. 8-2) If open wire or balanced type transmission
line is used with the antenna, a suitable antenna
tuner with balun is recommended between the
transceiver and the feed line. Methods of
construction and operating such tuners are
described in detail in the ARRL Antenna Handbook,
or similar publications.
For operation on the 160, 75 and 40 meter bands, a
simple dipole antenna, cut to resonance in the most
used portion of the band, will perform satisfactorily.
For operation on the 10, 15 and 20 meter bands, the
efficiency of the station will
be
greatly increased if a
good directional rotary antenna is used. Remember
that even the most sophisticated transceiver is
useless without a good antenna.
Fig. 8-2
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