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INSTALLATION
The IT-100 tuner is designed for indoor operation only; it is not water resistant. If you use it
outdoors (Field Day, for example), you must protect it from the rain. The IT-100 is designed for
use with coax-fed antennas. If use with longwires or ladder-line-fed antennas is desired, an
external balun is required. The LDG RBA-4:1 or RBA-1:1 is ideal, depending on the antenna
and transmission line used.
Always turn your radio off before plugging or unplugging anything. The radio may be
damaged if cables are connected or disconnected while the power is on.
Compatible Transceivers
The IT-100 is designed to be used with any Icom 100 watt transceiver that supports the AH-3
or AH-4 Icom antenna tuners. Currently, this includes:
IC-706
IC-718 (select AH-4)
IC-746
IC-7000
Installation
Connect the HF/50 MHz
antenna jack on the
transceiver to the TX jack on
the back of the IT-100, using
a 50 ohm coax cable rated
125 watts or greater.
Connect the supplied radio
interface cable to the mini-
DIN 6-pin jack on the rear of
the IT-100, marked “Radio”.
Connect the other end of this
cable to the “Tuner” jack on
the rear of the Icom
transceiver.
Connect the antenna feedline coax to the “ANT” jack on the rear of the IT-100.
Grounding the IT-100 tuner will enhance its performance and safety. LDG recommends that
you connect your tuner to a suitable ground; a common ground rod connected to buried radials is
preferred, but a single ground rod, a cold water pipe, or the screw that holds the cover on an AC
outlet can provide a serviceable ground. LDG strongly recommends the use of a properly
installed, high quality lightning arrestor on all antenna cables.
NOTE: If using with an IC-718, be sure to select AH-4 mode. See the IC-718 owner’s
manual for details.
Installation is now complete!
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