Mobile Operation - Kenwood TS-680S 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.
(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- Bumper ~_
ial cable. . ~
* Matching circuit examples
Qumper Antenna
ground
r—if—o
7
Disconnect ~~~
t Adjust length
po turn coil
Gnd Dip meter
Fig. 8-3 Adjusting Antenna Resonance
8-2. MOBILE OPERATION
8-2-1. Installation
Route battery and ANTENNA leads away fram all
high voltage secondary circuits to prevent ignition
noise interference.
Loading coll f
racket must have
Antenna
Antenna bra
l
To antenna terminal
| contact
good metal to metal ee
\
Antenna bracket
must have good "
metal to metal Coaxial cable
Bumper mounting!
bracket
stand high wind stress.
Pass coaxial cable
through the dram hole
Example of (power cord) wiring
41