MFJ-928 Compact IntelliTuner Automatic Antenna Tuner
Instruction Manual
©
2005 MFJ Enterprises, Inc.
7
WARNING: Make sure the +13.8 volts connection on the radio’s tuner port is capable of
supplying at least 750 mA of current, since the MFJ-928 uses up to 750 mA.
Jumper JP2, located behind the front panel circuit board, selects the radio to be connected to the
Radio Interface connector. Set this jumper to the “I” position to interface with radios that are
compatible with the Alinco EDX-2 tuner, Icom AH-3 and AH-4 tuners (also for interfacing to the
MFJ-5124Y3). Set the jumper to the “K” position to interface with radios that are compatible with
Kenwood AT-300 tuner. Set the jumper to the “Y” position to interface with Yaesu FT-100; “1”
position to interface with Yaesu FT-817, FT-857 or FT-897; and “2” position to interface with Yaesu
FT-847. If no cable is connected to the Radio Interface connector, set the jumper to the “0” position
to disable the interface. Default is “0”.
Jumper JP2
To Interface
Using
0
No Radio Interface
--
I
Alinco
Icom
Yaesu TUNER (FT-857/897)
MFJ-5114A
MFJ-5114I
MFJ-5124Y3
K
Kenwood
MFJ-5114K
Y
Yaesu CAT (FT-100)
MFJ-5114Y
1
Yaesu CAT (FT-817/857/897)
MFJ-5114Y
2
Yaesu CAT (FT-847)
MFJ-5114Y2
3
Reserved --
4
Reserved --
Table 1. Jumper JP2 Setting.
The MFJ-5114A interface cable provides power and control between an Alinco radio and the MFJ
automatic tuner. Supported Alinco radios are DX-70, DX-77, and any Alinco radio that supports the
Alinco EDX-2 tuner.
Pin 1 (Ground) connects to pins 4 and 5 of Radio Interface Plug.
Pin 2 (+13.8V) connects to pins 2 and 3 of Radio Interface Plug.
Pin 3 (Key) connects to pin 6 of Radio Interface Plug.
Pin 4 is not connected.
Pin 5 (Start) connects to pin 8 of Radio Interface Plug.
5
1
2
3
4
Figure 6. Alinco Interface Cable.
The MFJ-5114I interface cable provides power and control 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-765, IC-775, 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.
Summary of Contents for Compact IntelliTuner MFJ-928
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