Noise Reduction - Kenwood TS-120S Operating Manual

2. When tuning the newly installed antenna. use the TS-
120S(V) in the following procedure.
+ Turn the CAR control fully counter-clockwise for
minimum transmit power
+ With the TS-120S{V) in transmit mode. raise
transmit power output slowly by rotating the CAR
control clockwise. The antenna can be adjusted with
minimum power.
+ Transmitting with full power is recommended after
the antenna is adjusted for @ VSWR below 1.5:
3. Antenna installation is critical for successful mobile
operation. For further information r e f e r to THE RADIO
AMATEURS HANDBOOK, RADIO HANDBOOK. or
other texts
(3) Antenna Adjustment (Fig. 4-11)
(One turn cot
Bumper Antennd
'round
Grid Dip mater
Disconnect ~
Comsat cable
Fig. 4-11 Adjusting Antenna Resonance
4.7.4. NOISE REDUCTION
(2) Antenna Matching
In general, mobil
Matching Circuit Examples
ar-i20
our eur
Pur,
sllask
°
-o
Fig. 4-12 Matching Circuits
(3) Bonding
The component parts of motor vehicles, such as the engin
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 plug with internal
resistors, or resistive suppressor ignition cable.
(5) Battery Power Connection
It is recommended that battery power be supplied directly to
the TS-120S(V) from the battery terminals,