Operation; Mfj-939I Icom; Icom Radio Interface; Connections - MFJ Plug&Play Intellituner -939 Instruction Manual

MFJ-939 Plug&Play IntelliTuner Automatic Antenna Tuner

OPERATION

MFJ-939I Icom

IC-706, IC-707, IC-718, IC-725, IC-728, IC-736, IC-738, IC-746, IC-756, IC-7000
Operation
The operation of the MFJ-939I tuner is similar to the operation of the AH-3 or AH-4 described in the
Icom radio's operating manual.
1. Push and hold the [TUNER] button on the radio for one or two seconds to initiate automatic
tuning process. The radio will automatically switch to CW mode, transmit a 10-watt carrier, and
start the tuning process. When the tuning process is completed, the radio will stop transmitting,
return to its previous mode and power setting.
2. Push the [TUNER] button on the radio quickly to bypass the tuner or to cancel tuning in progress.
Note the [TUNE] button on the tuner will also key the Icom radio interface.

Icom Radio Interface

The MFJ-5114I radio interface allows users of AH-3 or AH-4 compatible Icom transceivers to connect to
the MFJ-939 Plug&Play IntelliTuner™ Automatic Antenna Tuner. With this interface, control signals are
connected between the radio and the tuner. The operator can then control the tuner with a single push of
the [TUNER] button on the front panel of the radio. Supported Icom radios are IC-706, IC-707, IC-718,
IC-725, IC-728, IC-736, IC-738, IC-746, IC-756, IC-7000, and any Icom radio that supports the Icom
AH-3 or AH-4 tuner.

Connections

The MFJ-5114I interface cable provides control signals between an Icom radio and the MFJ automatic
tuner. Supported Icom radios are IC-706, IC-707, IC-718, IC-725, IC-728, IC-736, IC-738, IC-746, IC-
756, IC-7000, and any Icom radio that supports the Icom AH-3 or AH-4 tuner. Push and hold the radio's
[TUNER] button for two seconds to start the tuning process. Push [TUNER] quickly to bypass the tuner.
Make sure jumper JP4 is removed for IC-7000
© 2006-2015 MFJ Enterprises, Inc.
Jumper Setting
JP2
JP4 REMOVE
CABLE MFJ-5114I
Icom
Table 1
1 Pin 1 (Key) connects to pin 6 of Radio Interface Plu
2
Pin 2 (Start) connects to pin 8 of Radio Interface Plug.
3 Pin 3 (+13.8V) connects to pins 2 and 3 of Radio Interface Plug.
4 Pin 4 (Ground) connects to pins 4 and

Figure 7 Icom Interface Cable.

I
g.
5 of Radio Interface Plug.
Instruction Manual
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