MFJ-939 Plug&Play IntelliTuner Automatic Antenna Tuner
Instruction Manual
2006-2015 MFJ Enterprises, Inc.
22
d. Press and hold in the [MENU] key for two seconds to save the new setting and exit to normal
operation. If you press the [MENU] key momentarily, the new setting will
not
be saved.
3.
Insert the 8-pin modular plug into the MFJ-939 RADIO INTERFACE jack.
4.
Connect the RCA plug on the MFJ-5114Y4 to the TX REQ jack on the rear panel of the
transceiver.
5.
Connect a 12V 750 mA DC source to the MFJ-939.
6.
Push the [POWER] button on the MFJ-939 to the
in
position. The radio may be powered on either
before or after the tuner is powered on.
Modification For Use With Alinco
Alinco Radio Interface
Any of the MFJ-939 series can be modifies for use with Alinco radios by changing the jumpers and
replacing the interface cable.
The MFJ-5114A radio interface allows users of EDX-2 compatible Alinco 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 [TUNE] button on the front panel of the radio. Supported Alinco radios are DX-70, DX-77, DX-701,
DX-801, and any Alinco radio that supports the Alinco EDX-2 tuner.
Connections
Jumper
Setting
JP2
I
JP4
Does Not Care
Cable
MFJ-5114A
Table 6
Alinco
Press the radio’s [TUNE] button to start the tuning process; for DX-70 press [FUNC] then [TUNE].
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 12 Alinco Interface Cable.
3.
Turn the tuner off. Set jumper JP2 to the “I” position.
4.
Insert the 8-pin modular plug into the tuner’s RADIO INTERFACE jack.
5.
Important:
Make sure the DC power to the radio has been turned off. The radio does not fuse the
DC power to the tuner, and damage to the radio can occur if the interface’s power connection
comes in contact with ground.
6.
Connect the 5-pin Molex connector to the mating 5-pin Molex connector, marked as ACC, on the
back of the Alinco radio.
7.
Push the [POWER] button on the tuner to the
in
position and then power on the radio.
Operation
The operation of the MFJ-939 tuner modified for use with Alinco radios is similar to the operation of the
EDX-2 described in the Alinco operating manual.