MFJ IntelliTuner -991, Instruction Manual

MFJ-991 / MFJ-994 IntelliTuner Automatic Antenna Tuners 

Instruction Manual 

©

 2004 MFJ Enterprises, Inc. 

7

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 3 (Key)  connects to the  Tip of 3.5 mm Stereo  Phone Plug.

Pin 5 (Start) connects to the  Ring  of 3.5 mm Stereo Phone Plug.

Pin 2 (+13.8V)  connects  to the Center Pin of Power  Plug.

Pin 1 (Ground) connects to  the Sleeves of  both  3.5  mm Stereo Phone  Plug and Power Plug.

Pin 4 is not  connected.

Figure 5.  Alinco Interface Cable. 

The MFJ-5124I 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 and AH-4 tuners. 
 

Pin 1 (Key)  connects  to the  Tip of 3.5 mm Stereo  Phone Plug.
Pin 2 (Start) connects to the  Ring  of 3.5 mm Stereo Phone Plug.
Pin 3 (+13.8V)  connects  to the Center Pin of Power Plug.
Pin 4 (Ground) connects to  the Sleeves of  both 3.5 mm Stereo Phone  Plug  and Power Plug.

Figure 6.  Icom Interface Cable. 

• 

Transmitter:

  SO-239 connector for coax cable from transmitter or transceiver. 

• 

Ground:

  Wing-nut terminal for RF ground wire connection. 

• 

Wire:

  Binding post for connecting single wire antenna.  Notice the WIRE binding post is internally 

connected to the ANTENNA connector. 

Note:  To use the WIRE binding post, make sure to remove the antenna, if any, from the 

ANTENNA connector. 

• 

Antenna:

  SO-239 connector for coax cable from antenna.  Notice the ANTENNA connector is 

internally connected to the WIRE binding post. 

Note:  To use the ANTENNA connector, make sure to remove the wire antenna, if any, from the 

WIRE binding post.