MFJ-998RT Legal Limit IntelliTuner
TM
Automatic Remote Antenna Tuner Instruction Manual
© 2011 MFJ Enterprises, Inc
MFJ-998RT Version 1A
23
WARNING
:
Do not touch anything inside the tuner during operation! Serious, painful RF burns can result.
1. Turn off the power to the transmitter and the tuner.
2. Remove the cover from the tuner (16 screws) with a Phillips screwdriver.
3. Connect the 50-ohm dummy load to the COAX connector; connect the transmitter to the
1. TRANSMITTER connector on the tuner.
4. Turn on the power to the transmitter. Set and lock the frequency to exactly 29.000 MHz.
5. Press and hold both the [C-DN] and [L-DN] buttons while turning the tuner power on. Both meter
needles will go to full scale and a message CAL FREQ 29.000 will display.
6. Key the transmitter to output about 10 watts. Adjust trimmer capacitor VC2 (located next to the
big integrated circuit) until the tuner displays a frequency of 29.000MHz and the meter needles
settle at the 0-watt marks. Notice the meter movement is exaggerated for easier calibration.
Nominal tolerance of the frequency counter is ±1 kHz.
7. Turn off the power to the transmitter and the tuner.
8. Secure the cover back onto the tuner.
List of Accessories
•
MFJ-912: 1.5 kW 4:1 balun
•
MFJ-1316: 12 VDC 1.5 amp power supply
•
MFJ-5409: 6 feet long RS-232 cable, female DB-9 to male DB9 connector
•
MFJ-5803: 3 feet long RG-58 A/U 50-ohm coax cable with a PL-259 connector on each end
•
MFJ-5806: 6 feet long RG-58 A/U 50-ohm coax cable with a PL-259 connector on each end
•
MFJ-5818: 18 feet long RG-58 A/U 50-ohm coax cable with a PL-259 connector on each end
