Kenwood TS-430S - Manual (Page 19)

O Matching Circuit Examples
o-------
INPUT 3^
O---- i--------
OUT PUT
O—(-
INPUT I L
o----
3^
OUTPUT
Fig. 5-10 Matching Circuits
(3) Bonding
The component parts of motor vehicles, such as the en­
gine, transmission, muffler system, accelerator, etc., are
coupled to one another at DC and low frequencies, but are
isolated at high frequencies. By connecting these parts
using heavy, braided ground straps, ignition noise can be
reduced. This connection is called "bonding".
(4) Use ignition Suppressor Cable or Suppressor Spark
Plugs
Noise can be reduced by using spark plugs with internal
resistors, or resistive suppressor ignition cable.
(5) Battery Power Connection
It is recommended that battery power be suppilied directly
to the TS-430S from the battery terminals.
CAUTION ----------------------------------------------------------------------------
Disconnect the TS-430S before jump-starting or before
charging the battery.
(6) Battery Capacity
The power system of a motor vehicle is comprised of a
battery and an alternator (which generates power while
the engine is running) to supply current to loads or to
charge the battery.
Since the transceiver draws high current during transmit,
care should be excersised so the power system is not
overloaded. When using the transceiver, the following
points should be observed from the viewpoint of battery
maintenance:
1. Turn the transceiver OFF when the lights, heater, wip­
ers and other high-draw accessories are used.
2. Avoid transceiver operation when the engine is not run­
ning.
3. If necessary, use an ammeter and/or a voltmeter to
check battery condition.
5.9.1. Power
The TS-430S requires more than 18A at 13.8 VDC when
transmitting at full power. Use the model PS-430 power
supply for fixed stations.
5.9 FIXED STATION OPERATION
For HF fixed-station operation, an antenna specifically de­
signed for amateur operation is recommended. Antenna
types include wire antennas, verticals, rotary beams, and
other antenna types. HF antennas are quite large and
must be installed to withstand strong wind, heavy rain,
etc.
Any antenna used with the TS-430S should be of 50-ohm
impedance and should be connected using an appropriate
coaxial cable such as RG-8/U.
Impedance matching is important. Impedance mismatch­
ing will result in a high VSWR and power loss, or can
cause unwanted harmonic radiation and interference (TVI,
BCD.
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 operation in
the 14, 21 and 28 MHz bands. (Fig. 5-11)
NOTE: --------------------------------------------------------------------------------
Protect your equipment - use a lightning arrestor.
19