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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.
(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.
0 Matching circuit examples
10-2.MOBll 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
good metal to metal contact -
---~
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To antenna terminal./
Antenna
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-
, /
~ Co~~~
,/ I
contact.
bracket
Since an HF antenna is large and heavy, it must be installed to with-
stand high wind stress.
'"
Pass coaxial cable
through the drain hole.
grommet
Example of (power cord) wiring
Fig. 10-4
44
Antenna DraCKet
.,
must.