MFJ-939 Plug&Play IntelliTuner Automatic Antenna Tuner
Instruction Manual
2006-2015 MFJ Enterprises, Inc.
32
19.
Remove the cross-needle wattmeter from header HD1.
20.
Remove the transmitter/wattmeter and the 50-ohm dummy load from the tuner.
21.
Secure the cover back onto the tuner.
22.
Connect your transmitter to the TRANSMITTER connector and connect your antenna to the
ANTENNA connector on the tuner.
Jumper Settings
There are several sets of jumpers that can be used to configure the MFJ-939 to match specific radios and
functions. Jumpers not listed in this chart are reserved for future use.
0 is no jumper, 1 or a letter is a jumper installed, and X indicated a do not care setting.
Jumper JP1 is used to disconnect power from the interface cable to insure the radio does not power the
tuner if the radio can not supply the needed power.
Jumper
JP1
Function
0
Disconnects power from the interface cable
1
Connects power from the interface cable
Table 10 Jumper JP1 Setting
Jumper JP2 is used to set the MFJ-939 to the radio model in use. Note that no jumper disables the radio
interface.
Jumper
JP2
To Interface
Using Cable
0
No Radio Interface
--
I
Alinco
Icom
Yaesu FT-1000MP FT-2000
FT-9000
Yaesu FT-2000
MFJ-5114A
MFJ-5114I
MFJ-5114Y3
MFJ-5114Y3
MFJ-5114Y4
K
Kenwood
MFJ-5114K
Y
Yaesu FT-100 FT-450 FT-857
FT-897 FT-950
MFJ-5114Y
1
Reserved
--
2
Reserved
--
3
Reserved
--
4
Reserved
--
Table 11 Jumper JP2 Setting
Jumper JP4 is used to set a pull up resistor on tuner data lines when needed.
Jumper JP4
Function
0
Icom, IC-706, IC-707, IC-718, IC-725, IC-728, IC-736, IC-738, IC-746, IC-756, IC-7000
1
Kenwood TS-50S, TS-450S, TS-480HX, TS-570S, TS-590, TS-690S, TS-850S, TS-870S, TS-2000
Yaesu FT-100, FT-450, FT-847, FT-857, FT-897, FT-950
X
Yaesu FT-1000MP FT-2000 FT-9000
Alinco DX-70, DX-77, DX-701, DX-801
Table 12 Jumper JP4 Setting