Mobile Operation - Kenwood TS-440S Instruction Manual

The antenna to be used should first be checked with
a dip meter to insure that it is designed for your oper-
ating band, then the impedance matching should be
checked with an SWR meter. (Fig. 10-3)
The VSWR should preferably be less than 1.5:1 for
stisfactory operation. For antenna adjustment refer to
the antenna instruction manual.
| 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 an-
tenna tuner between the transceiver and the coaxial
cable,
'One turn coil
o Matching circuit examples
Bumper Antenna
ground
A : : Grid Dip meter
4 OUTPUT Disconnect
INPUT, OUTPUT inpur! Coaxial cable
o —~—O o = —O .
Fig. 10-3 Adjusting Antenna Resonance
10-2.MOBIL OPERATION
10-2-1. Installation
Route battery and ANTENNA leads away from all high
voltage secondary circuits to prevent ignition noise in-
terference.
Loading coil
Antenna bracket must have
Antenna good metal to metal contact
To antenna terminal
must have good
contact, SN i
B i q jumper mounting —
bracket
Since an HF antenna is large and heavy, it must be installed to with-
stand high wind stress.
Pags coaxial cable
through the drain hole.
Example of (power cord) wiring Fig. 10-4
44