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Status of LEDs
The SWR LED and Tuning LED are used to indicate both operating modes, tuning status,
and error codes. The following table lists the LED status codes and their meaning.
LED Indication Meaning
Tuning LED on. Tuner is tuning.
Tuning LED goes out, SWR LED comes
on solid.
Tuner has completed a tuning cycle; a
good SWR match was found.
Tuning LED goes out, SWR LED blinks 5
times.
Tuning cycle is complete, tuning match is
between 1.5:1 and 3.0:1 SWR.
Tuning LED goes out, no SWR LED.
Tuning cycle is complete, tuning match is
greater than 3.0:1 SWR.
Tuning LED blinks 4 times. Tuning cycle failed, no RF was detected.
Tuning LED blinks 5 times.
Tuning cycle failed, RF was lost in the
middle of the tune.
OPERATING HINTS
This section describes a few practical tips on using the IT-100 tuner with ICOM transceivers.
Transceiver Tuner Status Indication
The various models of ICOM transceivers all indicate the status of the external tuner a little
differently. Most will show an graphical or textual icon on the screen to indicate that the tuner is
engaged and has properly tuned. For example, the IC-7000 displays a icon while tuning,
and a solid icon when tuning is complete. This icon disappears when the tuner is
bypassed, and blinks if a tuning cycle failed to find a good match. Other ICOM transceivers
behave similarly. Consult your transceiver operating manual’s section on use with external
tuners for more information.
IC-718 Installation
Note that on the IC-718 transceiver, you must select AH-4 operation in order to operate with
the IT-100. To do this, turn off the IC-718. Then, while holding [SET], push [PWR] to turn
power on. Push [UP] or [DN] several times to select [TUNER]. Rotate the main dial to select the
“4” setting, which selects AH-4 mode. Turn the power to the IC-718 off and back on again.
Automatic Bypass on Band Change
Most Icom transceivers will send a bypass command to the IT-100 any time the operating
band is changed. This is a feature of the Icom transceiver, and not a design feature of the IT-100.
APPLICATION INFORMATION
Mobile Operation
The IT-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 remains dry.
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