MFJ-998 Legal Limit IntelliTuner Automatic Antenna Tuner
Instruction Manual
©
2007-2010 MFJ Enterprises, Inc.
34
Kenwood Radio Interface
The MFJ-5114K radio interface allows users of AT-300 compatible Kenwood transceivers to connect to
the MFJ-998
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 [AT
TUNE] button on the front panel of the radio. Supported Kenwood radios are TS-50S, TS-450S, TS-
480HX, TS-570S, TS-690S, TS-850S, TS-870S, TS-2000, and any Kenwood radio that supports the
Kenwood AT-300 tuner.
Note: The TS-480HX will automatically reduce its TX power to 100 watts maximum (25 watts AM)
when the radio interface is used.
Connections
1. Select
KENWOOD AT-300
in the tuner’s Radio Interface setup menu. Turn the tuner off.
2. Make sure jumper JP1 inside the MFJ-998 is installed.
3. Insert the 8-pin modular plug into the tuner’s RADIO INTERFACE jack.
4. 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.
5. Connect the 6-pin molex connector to the mating 6-pin molex connector, marked as AT or ACC,
on the back of the Kenwood radio.
6. Connect a 12V 1.5 amp DC source to the MFJ-998.
7. Push the [POWER] button on the tuner to the
in
position and then power on the radio.
8. Some Kenwood radios automatically check to see if an external antenna tuner is connected during
power on. For other Kenwood radios, such as the TS-450S and the TS-690S, the External
Antenna Tuner menu in the radio menu system must be enabled. Refer to your radio’s operating
manual for accessing the menu system and preparing the AT-300 external antenna tuner
operation. Use TS-450S and TS-690S as an example:
a. Press and hold the [ENT] key while turning the power on.
b. Rotate the [M.CH/VFO CH] control to select menu number 01 on the display.
c. Press the [UP] or [DOWN] key to change the setting to “ON.”
d. Press the [CLR] key to return to normal operation.
Operation
The operation of the MFJ-5114K radio interface is similar to the operation of the AT-300 described in the
Kenwood radio’s operating manual.
1. Press and hold the [AT TUNE] button on the radio for one second to initiate automatic tuning
process. The radio will automatically switch to CW mode, transmit a 10-watt carrier, and start
the tuning process. When the tuning process is completed, the radio will stop transmitting, return
to its previous mode and power setting.
2. Press the [AT TUNE] button on the radio quickly to bypass the tuner (some Kenwood radios,
such as the TS-690S, do not have this bypass function) or to cancel tuning in progress.
Note the [TUNE] button on the tuner will not operate the Kenwood radio interface.
