MFJ-939 Plug&Play IntelliTuner Automatic Antenna Tuner
Instruction Manual
2006-2015 MFJ Enterprises, Inc.
19
Tip (KEY) connects to pin 6 of Radio Interface Plu
Sleeve (GND) connects to pins 4 and of Radio Interface Plug.
with a diode and a 22.1k ohm 1% resistor in series.
5
g
1
2
KEY
GND
22.1K
1N4148
4.2V + 0.13V
Figure 10 Yaesu Interface Cable (1000MP/2000/9000 series).
Connections for FT-1000MP series of radios
1.
Turn the tuner off. Set jumper JP2 to the “I” position.
2.
Before connecting the MFJ-5114Y3 to your radio, set the maximum TUNE power of the radio as
follows:
a.
On your transceiver, enter the Menu mode by pressing and holding the [FAST] key and then
pressing [ENT].
b.
Rotate the [MEM/VFO CH] knob until you see menu 4-3 on the transceiver’s CH display.
c.
Rotate the [MAIN VFO] knob to select 50 for 100-watt radios (FT-1000MP/MP Field) or 75
for the FT-1000MP MKV when an amplifier will be used. This gives the best SWR accuracy,
which may be important for solid-state amplifiers. When an amplifier is not used, the setting
can be set at 10 for all transceivers.
d.
Press [ENT] to exit the Menu mode.
3.
Insert the 8-pin modular plug into the MFJ-939 RADIO INTERFACE jack.
4.
Connect the 3.5-mm mono plug on the MFJ-5114Y3 to the REMOTE 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.
Connections for FT-2000 series of radios
1.
Turn the tuner off. Set jumper JP2 to the “I” position.
2.
Before connecting the MFJ-5114Y3 to your radio, set the maximum TUNE power of the radio as
follows:
a. On your transceiver, enter the Menu mode by pressing the [MENU] key momentarily.
b.
Rotate the Main Tuning Dial knob until you see menu item [145 tGEn TUN PWR] on the
transceiver’s display.
c.
Rotate the [SUB VFO-B] knob to select 20 watts for best SWR accuracy. For the FT-2000D,
we recommend that this be set to 50 watts if the user normally operates at 100 watts output
power (when power is turned down to 100 watts, the TUNE power will reduce to 25 watts). If
the operator normally has his FT-2000D set for the full 200 watts, then this should be set to
20 watts.
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 3.5-mm mono plug on the MFJ-5114Y3 to the REM (REMOTE) jack on the rear
panel of the transceiver.
