Reference; Antenna Installation - Kenwood TS-140S Instruction Manual

8. REFERENCE
8-1. ANTENNA INSTALLATION
8-1-1. Fixed Station
For HF fixed-station operation, an antenna
specifically designed for amateur operation is recom-
mended. Antenna types include wire antennas, ver-
ticals, rotary beams, and other antenna types. (Fig.
8-1) HF antennas are quite large and must be install-
ed to withstand strong wind, heavy rain, etc.
Any antenna used with the TS-140S should be of
50-ohm impedance and should be connected using
an appropriate coaxial cable such as 5D-2V.
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 an SWR
meter. Generally, satisfactory operation is assured
when the VSWR (Voltage Standing Wave Ratio) is
less than 1.5:1.
A rotary beam antenna is very effective for DX com-
munication 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.
Ground plane antenna
Dipole antenna
Fig. 8-1
Fig. 8-2
8-1-2. Mobile
(1) Antenna
(2) Coaxial cable connection
(3) Adjustment