MFJ MFJ-989D, Instruction Manual

MFJ-989D VersaTuner V 

Instruction Manual 

6 

8. Power PK/AVG:

  Selects the meter detection (

Peak

 or 

Average)

.**    

9. Lamp On/Off:  

Turns meter's LED lighting on or off.** 

NOTE*

  The control scales track frequency rather than component value. Tuned circuits typically 

require progressively lower values of L and C as frequency increases. 

NOTE**

 External 12-volt source is required for LED lighting.   

Rear Panel Layout 

6

1

2

COAX-1

COAX-2

METER LAMP

TRANSMITTER

GND

BAL LINE

WIRE

Install Jumper For

Balanced Line

Operation

12V DC

<

5

4

3

7

 1. Meter Lamp:   

2.1-mm coaxial power jack accepts 12 vdc to operate the LED meter lamps and the 

metering circuit (see text) 

2. Transmitter:  

Accepts PL-259, connects transceiver or amplifier to tuner. 

3. Coax-1:  

Accepts PL-259, connects antenna #1 to tuner routing switch. 

4. Coax-2:  

Accepts PL-259, connects antenna #2 to tuner routing switch. 

5. GND:  

Chassis ground, connects tuner to station's ground system. 

6. Bal Line:  

Antenna side of the 1:1 balun, accepts balanced feedlines.

7.  Wire:   

terminal post (

Wire

) accepts single-wire antennas. To feed balanced antennas through the 

balun, the   

Wire

 terminal is connected to the terminal post below with a jumper (see text).