MFJ-939 Plug&Play IntelliTuner Automatic Antenna Tuner
Instruction Manual
2006-2015 MFJ Enterprises, Inc.
21
MFJ-939Y4 FT-2000
Operation for FT-2000 series of radios
The transceiver is controlled by the MFJ-939. To operate:
1. Press the [TUNE] button on the MFJ-939 for ½-2 seconds to initiate the tuning process. The radio
will automatically transmit a low-power carrier and start the tuning process. When tuning is
completed, the radio will stop transmitting and you will be ready for operation on this frequency.
Yaesu Radio Interface MFJ-5114Y4
The FT-2000 series radio has a TX REQ input on the back that can be used in lieu of the REM
(REMOTE) input. If this option is chosen, you must use the MFJ-5114Y4 radio interface cable. With this
interface, control signals are connected between the radio and the tuner. With this cable the operator can
control the tuner and radio with a single push of the [TUNE] button on the front panel of the MFJ-939.
Connections for FT-2000 series of radios
Jumper
Setting
JP2
I
JP4
Does Not Care
CABLE
MFJ-5114Y4
Table 5
Y4 Interface
The MFJ-5114Y4 interface provides TX REQ input control signals between the Yaesu FT-2000 and FT-
2000D radios and the MFJ automatic tuner. This cable plugs into the TX REQ RCA jack on the rear panel
of these Yaesu radios, and keys the Yaesu radios in the CW tune mode whenever the MFJ-939’s [TUNE]
button is pushed. MFJ recommends that the Yaesu tune power setting be set to 20 watts (Yaesu menu 145
tGEn TUN PWR) during the tune process
Center pin (KEY) connects to pin 6 of Radio Interface Plu
Ground (GND) connects to pins 4 and of Radio Interface Plug.
5
g.
1
2
KEY
GND
Figure 11 Yaesu Interface Cable (FT-2000 series)
1.
Turn the tuner off. Set jumper JP2 to the “I” position.
2.
Before connecting the MFJ-5114Y4 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.