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Application Information
Mobile Operation
The KT-100 is perfectly suited to mobile operation. It can be installed under the dashboard
along with the transceiver, or mounted remotely. The only requirement is that the tuner remain
dry and not in continuous direct sunlight.
The supplied radio interface cable is 14 inches long. If it is desired that the KT-100 is
positioned farther from the transceiver than this cable length allows, a custom cable will need to
be constructed. This can be accomplished in two ways: Cut the supplied cable and solder a
jumper wire between all the connections, or purchase new connectors and cable to construct a
custom-length interface cable from
scratch.
The 6-pin AT-300 interface connector
(square) is Kenwood Part Number E09-
0672-08, available from several Kenwood
replacement part dealers. The 7-pin KT-
100 interface connector (round) is Kycon
Connector Part Number KMDAX-7P,
available from http://www.mouser.com/ as
Mouser part number 806-KMDAX-7P.
MARS/CAP Coverage
The KT-100 provides continuous
tuning coverage over its specified range;
not just in the ham bands. This makes it
useful for MARS or CAP operation, or any
other legal HF operation.
THEORY OF OPERATION
Some basic ideas about impedance
The theory underlying antennas and
transmission lines is fairly complex, and in fact employs a mathematical notation called
“complex numbers” that have “real” and “imaginary” parts. It is beyond the scope of this manual
to present a tutorial on this subject
3
, but a little background will help in understanding what the
KT-100 is doing, and how it does it.
In simple DC circuits, the wire resists current flow, converting some of it into heat. The
relationship between voltage, current, and resistance is described by the elegant and well-known
“Ohm’s Law”, named for Georg Simon Ohm of Germany, who first discovered the principle in
1826. In RF circuits, an analogous but more complicated relationship exists.
RF circuits also resist the flow of electricity. However, the presence of capacitive and
inductive elements causes the voltage to lead or lag the current, respectively. In RF circuits, this
3
For a very complete treatment of this subject, see any edition of the ARRL Handbook for Radio Communications
(previously the Handbook For Radio Amateurs).
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