MFJ-939 Plug&Play IntelliTuner Automatic Antenna Tuner Instruction Manual
2006-2015 MFJ Enterprises, Inc.
14
Operation for FT-950
The operation of the MFJ-5114Y radio interface is similar to the operation of the FC-40 described in the
Yaesu radio operating manual.
1. Press the (TUNE) button on the radio briefly to enable the external tuner function. The “TUNER”
icon will appear in the radio’s display.
2. Press and hold the (TUNE) button on the radio for one second to begin automatic tuning. The
radio will automatically transmit a low-power carrier and start the tuning process. The “TUNER”
icon will blink while tuning is in progress. Press the (TUNE) button on the radio while tuning is
in progress to cancel the automatic tuning.
Note the [TUNE] button on the tuner will not operate the MFJ-5114Y Yaesu radio interface.
Note: The FT-950 will not start automatic tuning when the SWR is greater than approximately 5:1,
indicated by both “TUNER” and “HI-SWR” icons blinking once when the (TUNE) button on the
radio is pressed and held for one second.
For operation of compatible radios not listed above follow the instructions in the radio operations manual
on the external tuner use like the FC-20, FC-30, or FC-40. They are similar to the radios listed above.
Yaesu Radio Interface MFJ-5114Y
The MFJ-5114Y radio interface allows users of FC-30 compatible Yaesu transceivers to connect to the
MFJ-939 Plug&Play IntelliTuner™ Automatic Antenna Tuners. 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) key on the front panel of the radio. Supported Yaesu radios are FT-100, FT-450, FT-857, FT-
897, FT-950, and any Yaesu radio that supports the Yaesu FC-30 tuner.
Connections
Jumper Setting
JP1 Y
JP4 INSTALLED
CABLE MFJ-5114Y
Table 3 Yaesu
Push and hold the radio’s (TUN) or (TUNE) key to start the tuning process.
Make sure jumper JP4 is installed.
(TX INH) connects to pin 7 of Radio Interface Plug.
(SENSE) connects to pin 5 of Radio Interface Plug.
g.
RX
Pin 8 (+13.8V) connects to pin 3 of Radio Interface Plug.
Pin 1
Pin 2 is not connected.
Pin 3
Pin 4 (TX) connects to pin 6 of Radio Interface Plu
Pin 5 ( ) connects to pin 8 of Radio Interface Plug.
Pin 6 (Ground) connects to pin 4 of Radio Interface Plug.
Pin 7 is not connected.
1 2 3
4 5 6
7 8
Yaesu
Rear Panel View
1
2
3
4
5
6
7
8
Figure 9 Yaesu Interface Cable (FT-100/-450/-857/-897/-950).
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