MFJ MFJ-9412 Instruction Manual Download | Manualshive

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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

COPYRIGHT 2013 MFJ ENTERPRISES, INC.

C

Model MFJ-9412

VERSION 1A

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Summary of Contents for MFJ-9412

Page 1: ...AUTION 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 2013 MFJ ENTERPRISES INC C Model MFJ 9412 VERSION 1A ...

Page 2: ...e from unwanted interference Real S Meter Steer your beam with pin point accuracy and give meaningful signal reports with a full size analog meter Also monitor speech processing level Agile Tuning No abrupt tuning rate chages or stair stepping Reduction drive analog VFO lets you scan the band quickly yet zero in on SSB signals smoothly Great for hunt and pounce contest operation Impressive Audio A...

Page 3: ...tion grade crystal IF filter built in heavy duty speaker fully analog mechanical S meter optional semi break in CW module and intuitive controls Typical Specifications Receiver Section Frequency Coverage 24 890 24 990 MHz Mode USB Receiver Type Single conversion Superhet Frequency Control 6 MHz VFO mixed to 34 9 MHz IF Frequency 10 MHz IF Selectivity 6 dB 2 4 KHz AGC Audio derived 70 dB dynamic ra...

Page 4: ...FJ 9412 does not provide automatic high VSWR shutdown circuitry Operation into extremely reactive loads may result in out of band spurious emissions in violation of FCC rules Speech Processing The MFJ 9412 processor rapidly readjusts transmitter IF gain for each spoken syllable For best results hold the Mic about 1 2 from your lips and speak normally The S meter should deflect 1 2 scale as you spe...

Page 5: ...itter is keyed 5 KEY JACK Accepts telegraph key only used with CW adapter module 6 VFO TUNE Tunes in stations indicates operating frequency 7 VFT Fine tune control for precise SSB tuning 8 VOLUME Adjusts listening level MFJ Enterprises Inc Starkville MS USA Mic Gain Ext Amp Pwr Antenna 3 4 Phones 5 2 1 Rear Panel 1 MIC GAIN Adjusts speech amp gain normal setting 12 00 2 EXT AMP Accepts RCA plug ke...

Page 6: ...ear as possible but remember to factor in feedline loss A chimney mounted antenna at 40 with a short low loss feedline may actually out perform one mounted 20 higher with a long lossy feed Be sure to isolate your antenna from other larger antennas or RF reflective metallic surfaces that may distort its normal radiation pattern Coax Cable For runs to 60 RG8X or mini 8 works well at 24 9 MHz For lon...

Page 7: ... U3 DSB generated by U7 is routed to the IF filter Y1 Y6 where the lower sideband is removed IF amplifier U2 compresses the USB signal at a syllabic rate and routes it to transmit mixer U8 At U8 the 10 MHz IF signal mixes with 34 9 MHz VFO energy for conversion to 24 9 MHz The signal is then amplified by driver stages Q10 and Q11 Interstage matching and 24 9 MHz passband filtering are provided by ...

Page 8: ... OSC coil L5 and filter coils L6 L7 for maximum RX sensitivity 9 Carrier Balance Carefully adjust BAL trimpot R57 for minimum carrier 10 Mic Gain Set for preference 12 00 position is factory default 11 PA Bias Attach 200 uA meter at 15 Set bias pot for 20 25 uA reading Note To adjust 12 13 install a shorting plug at 14 to insert carrier Also turn ALC trimpot R73 clockwise to disable ALC line shoul...

Page 9: ...adjusted by owners and users CARRIER CARRIER INSERT L1 L2 T1 T2 T3 MIC GAIN RSSI V REG ZERO PA OUTPUT INPUT PA DRIVER PRE DRIVE ALC VFO CAL MIXER MXR OSC VFT VOL VFO TUNE KEY TX MIC PWR PWR EXT AMP PA BIAS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 17 16 BFO TP M MXR FIL BAL MOD RX IF RX TX IF RX RF LEVEL NULL 18 Note For trimpots trimcaps and IF cans T1 T3 use a non conductive tuning wand with a metalli...

Page 10: ...reshold R11 is set for 4 3V at RSSI test point no signal When both readings are set adjust R17 for zero meter deflection Poor carrier suppression Turn Mic gain off fully CCW and key the radio while monitoring signal on an external receiver Adjust R57 for minimum carrier Low or distorted transmit audio Check to see if mic gain is set too low Also make sure you are using a 600 Ohm low Z dynamic micr...

Page 11: ...ovided to cover postage and handling 4 This warranty is NOT void for owners who attempt to repair defective units Technical consultation is available by calling 601 323 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 ...

Page 12: ...MFJ 9412 Manual Version 1A Printed In U S A 300 Industrial Park Road Starkville MS 39759 ...

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