MFJ -994BRT IntelliTuner Instruction Manual Download Page 1

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2011 MFJ Enterprises, Inc.

INSTRUCTION MANUAL

CAUTION: Read All Instructions Before Operating Equipment

MFJ ENTERPRISES, INC.

300 Industrial Park Road

Starkville, MS 39759 USA

Tel: 662-323-5869 Fax: 662-323-6551

Model MFJ-994BRT

VERSION 1A

Summary of Contents for -994BRT IntelliTuner

Page 1: ...TION MANUAL CAUTION Read All Instructions Before Operating Equipment MFJ ENTERPRISES INC 300 Industrial Park Road Starkville MS 39759 USA Tel 662 323 5869 Fax 662 323 6551 COPYRIGHT 2010 MFJ ENTERPRISES INC C Model MFJ 994BRT VERSION 1A ...

Page 2: ...enna 5 Installation 6 MISCELLANEOUS Antenna Memory 7 Intellitune Algorithym 7 LC Limits 7 Tuner Status Indicators 8 Foldback Circuit 8 Grounding Hints 9 Antenna System Hints 9 Location 9 Matching Problems 9 APPENDICES Firmware Version Number 11 Resetting the Tuner 11 Factory Defaults 11 Delete Antenna Memory 11 Total Reset 12 Self Test 12 Power Down Circuit Test 13 Relay Test 13 Frequency Counter ...

Page 3: ...cally adjusts for minimum SWR and remembers the frequency and tuner settings safely stored in non volatile memory The next time you operate on that frequency or close to it the tuner settings are instantly restored and you re ready to operate in milliseconds There are four banks of memory which can learn and remember more than 2500 frequencies and tuner settings per bank When you key your transmit...

Page 4: ...tennas Optional remote control Optional radio interface cables for compatible radios Specifications Impedance matching range 12 to 800 ohms SWR matching range Up to 4 1 for 50 ohms and up to 16 1 for 50 ohms Minimum power for tuning 2 watts optimum SWR tuning accuracy occurs at 10 20 watts Maximum power while tuning 100 watts with foldback 20 watts without foldback RF power limit 600 watts PEP SSB...

Page 5: ...ack on the MFJ 4117 Bias Tee This is your DC voltage input connector 3 Connect the RF DC OUT IN coaxial connector on the MFJ 4117 Bias Tee to the TRANSMITTER connector on the MFJ 994BRT Intellituner using 50 ohm coaxial cable The MFJ 994BRT Intellituner will recover the RF and DC signals 4 Connect your coax fed antenna to the ANTENNA connector using a 50 ohm coaxial cable or connect your random wi...

Page 6: ...icted to limit the maximum voltage and current across the tuner s components Note Pressing C DN and L DN simultaneously places the tuner in bypass mode The reflected meter needle momentarily bounces to the 20 watt mark to indicate this RF from the transmitter goes directly to the antenna with no matching AUTO Button Used to select automatic or semi automatic tuning mode Button out selects automati...

Page 7: ... A MFJ 4117 bias tee is connected in line between the transmitter output and this connector This provides 12 volts DC on the coax to power the tuner The MFJ 4117 is included with the MFJ 994BRT Antenna SO 239 connector for coax cable from antenna or binding post for wire antennas The ANTENNA connector is internally connected to the WIRE binding post Note When using the ANTENNA connector make sure ...

Page 8: ...n the MFJ 4117 Bias Tee using a 50 ohm coaxial cable See Figure 1 This is the RF signal input connector 4 Connect a 12 15 VDC voltage source capable of supplying at least 750 milli amps to the DC IN OUT jack on the MFJ 4117 Bias Tee This is your DC voltage input connector 5 Connect the RF DC OUT IN coaxial connector on the MFJ 4117 Bias Tee to the TRANSMITTER connector on the MFJ 994BRT Intellitun...

Page 9: ...0150 10 20 14000 14350 14 17 18068 18168 18 15 21000 21450 21 12 24890 24990 25 10 28000 29700 28 Table 1 Memory Resolution The memory resolution for non amateur frequency bands between 160 and 10 meters is approximately 0 2 percent of the lower frequency of each band There are over 2500 memory locations IntelliTuneTM Algorithm When the tuner cannot find an appropriate setting in its memory it beg...

Page 10: ...n Indicates By One Flash Indicates By Two Flashes By Pressing Antenna 1 2 ANT 1 second Memory Bank Bank A 1 Beep Bank B 2 Beep Bank C 3 Beep Bank D 4 Beep Off 5 Beep ANT 1 second Bypass Toggle Bypass Mode L 0 and C 0 Restore Last L C Setting TUNE 0 5 sec Tuned SWR SWR 1 5 1 Beep SWR 2 0 2 Beep SWR 2 5 3 Beep SWR 3 0 4 Beep SWR 3 0 SWR TUNE for 0 5 to 2 seconds StickyTune On Off TUNE 2 seconds Tuni...

Page 11: ...by themselves are almost useless for dependable RF grounding RF grounds work much better when spread out over a large area especially when they employ multiple connections directly to the equipment ground point Metal water pipes heating ducts and fences may work especially if they are connected together with multiple wires but the best RF grounds are radial systems or multi wire counterpoises Radi...

Page 12: ...stions will reduce the difficulty in matching an antenna with a tuner Never center feed a half wave multi band antenna with a high impedance feedline that is close to an odd multiple of a quarter wave long Never center feed a full wave antenna with a feedline close to a multiple of a half wave long If this tuner will not tune a multi band antenna add or subtract 1 8 wave of feedline for the band t...

Page 13: ... is calibrated To obtain the firmware version number press and hold the C UP button while turning the power on The version number X YY is represented by the meter forward needle for X forward reading 10 and the reflected needle for YY reflected reading For example forward needle on 20 watt mark and reflected needle on 2 watt mark represent firmware version number 2 02 Release button to resume norm...

Page 14: ... A self test routine checks the functions of the tuner This routine checks the meter the front panel buttons and the internal memory During the self test you may stop the test by turning off the unit however this should NOT be done during the memory test or the memory could be corrupted The self test can be completed in approximately 30 seconds This test also can be used to test the MFJ 994RC Remo...

Page 15: ...on volatile memory The Power Down Circuit Test checks the power down detection circuitry It is recommended that this test be done immediately after the regular self test described above Note The tuner must be reset to factory defaults before performing this test Here is the test procedure 1 Make sure power to the tuner is off 2 If the tuner has been reset to factory defaults skip to step 6 otherwi...

Page 16: ... produce a click Frequency Counter Calibration Frequency Counter Calibration To calibrate the frequency counter you will need a transmitter a 50 ohm dummy load two 50 ohm SO 239 coax cables a Phillips screwdriver and a tuning tool or small flat blade screwdriver WARNING Do not touch anything inside the tuner during operation Serious painful RF burns can result WARNING Never operate the MFJ 994B wi...

Page 17: ...ase the buttons 6 Key the transmitter to output 100 watts and adjust the trimmer capacitor C91 for minimum reflected power Notice the reflected meter movement is exaggerated for easier calibration 7 Key the transmitter to 100 watts output and adjust the FWD trimpot R72 until the forward power needle indicates 100 watt mark 8 Press the TUNE button and observe that the reflected power needle goes to...

Page 18: ...lped if you have your unit manual and all information on your station handy so you can answer any questions the technicians may ask You can also send questions by mail to MFJ Enterprises Inc 300 Industrial Park Road Starkville MS 39759 by facsimile FAX to 662 323 6551 or by email to techinfo mfjenterprises com Send a complete description of your problem an explanation of exactly how you are using ...

Page 19: ...s Inc 17 Figure 11 MFJ 994B Circuit Block Diagram Transmitter Antenna Remote Port Radio Interface Wire Impedance Sensor SWR Sensor Frequency Counter Memory Microcontroller Relay Drivers Ground Inductors 0 17 uH Capacitors 0 2950 pF SWR Wattmeter Push Buttons User Interface Z L Network ...

Page 20: ...age and handling 4 This warranty is NOT void for owners who attempt to repair defective units Technical consultation is available by calling 662 323 5869 5 This warranty does not apply to kits sold by or manufactured by MFJ Enterprises Inc 6 Wired and tested PC board products are covered by this warranty provided only the wired and tested PC board product is returned Wired and tested PC boards ins...

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