Mobile Operation - Kenwood TS-140S Instruction Manual

The antenna to be used should first be checked with
a dip meter to insure that it is designed for your
operating band, then the impedance matching
should be checked with an SWR meter. (Fig. 8-3)
The VSWR should preferably be less than 1.5:1 for
satisfactory operation. For antenna adjustment refer
to the antenna instruction manual.
t Adjust length
(4) Antenna matching
In general, mobile antennas have a lower impedance
than the 50-ohm coaxial cable used to feed them,
resulting in a mismatch between the antenna and the
coax. Such trouble can be eliminated by using an
antenna tuner between the transceiver and the coax-
ial cable.
¢ Matching circuit examples
Bumper Antenna
ground
Grid Dip meter
Disconnect
OUTPUT Coaxial cable
INPUT. OUTPUT
oO o
—o
Fig. 8-3 Adjusting Antenna Resonance
8-2. MOBILE OPERATION
8-2-1. Installation
Route battery and ANTENNA leads away from all
high voltage secondary circuits to prevent ignition
noise interference.
Loading coil _
Antenna bracket must have
To antenna terminal
good metal to metal contact
Antenna
Bumper mounting =
stand high wind stress.
Pass coaxial cable
through the drain hole.
Example of (power cord) wiring Fig. 8-4
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