Kenwood TS-430S - Manual (Page 18)

POWER CABLE
CAUTION: Observe battery polarity.
TS-430S
Red and White +
Black and gray -
Connect the TS-430S power cable to the battery termin­
als, with consideration to current requirements and noise
prevention. The maximum current drawn by the TS-430S
reaches to between 18 and 20A when transmitting.
Therefore, the cable should be made as short as possible,
using the specified fuse. Also, determine that the power
system of the car (including the battery and generator or
alternator) will handle the increased load of the TS-430S.
Route battery and ANTENNA leads away from all high vol­
tage secondary circuits to prevent ignition noise interfer­
ence.
5.8.3. MOBILE ANTENNA
(1) Antenna Installation
Use a sturdy mount for the mobile antenna since HF an­
tennas are larger (and have more wind load) and are hea­
vier than VHF antennas. A bumper mount is recommend­
ed for general use. The ground side of the mount must be
well grounded to the car body, since the body itself func­
tions as the ground plane for the mobile antenna. (Refer to
Fig. 5-8)
NOTES: ------------------------------------------------------------------------------
1. Some cars have plastic bumpers. For such cars, ground
the antenna mount to the body.
2. When tuning a newly installed antenna, use the follow­
ing procedure:
• Turn the CAR control fully counter-clockwise for
minimum transmit power.
• With the transceiver in transmit mode, raise transmit
power output slowly by rotating the CAR control
clockwise. The antenna should be adjusted with
minimum power.
• Transmitting with full power is recommended only
after the antenna has been adjusted for a VSWR be­
low 1.5:1.
3. Antenna installation is critical for successful mobile
operation. For further information refer to THE RADIO
AMATEUR'S HANDBOOK, RADIO HANDBOOK, or
other texts.
(2) Coaxial Cable Connection
When the antenna is mounted on the vehicles bumper, the
coaxial cable from the antenna can be routed through a
drain hole in the trunk. When the antenna is roof mounted
pass the cable between the body and door. Leave a drip-
loop at the lowest point in the cable before entry into the
vehicle to prevent water from entering the car.
(3) Antenna Adjustment
Some mobile antennas are not designed at 50-ohm impe­
dance. In this case, impedance matching between the an­
tenna and the coaxial cable (50Q) is required. This can be
achieved by using an antenna matching device or coupler.
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. (See Fig. 5-9)
The VSWR should preferably be less than 1.5:1 for satis­
factory operation. For antenna adjustment refer to the an­
tenna instruction manual.
5.8.4. NOISE REDUCTION
In motor vehicles, noise is generated by the ignition sys­
tem. Other sources of noise include the wiper and heater
motors.
Although the TS-430S is equipped with a noise blanker to
minimize ignition noise, it is imperative that some preven­
tive measures be taken to reduce the noise to the lowest
possible level.
(1) Antenna location Selection
Since ignition noise is generated by the vehicles engine,
the antenna must be installed as far from the engine as
possible.
(2) 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 trou­
ble can be eliminated by using an antenna tuner between
the TS-430S and the coaxial cable.
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