MFJ MFJ-9406, MFJ-9406X User Manual

MFJ-9406 Instruction Manual

INTRODUCTION:

Congratulations on your choice of the MFJ-9406 six-meter SSB Transceiver. Please read this manual carefully before attempting to operate your new radio. Let's begin with an introduction to some special features we think you'll like!

Easy to Operate: No microprocessor mumbo-jumbo. Just turn on and tune in!

Potent Signal: 10-Watt PEP--plus Constant Current

syllabic speech processing for an

added 4 to 6-dB advantage to cut through noise, fading, and QRM.

Low Drain: Mountain top on a D-cell NiCd pack--or operate at home with any 2-A AC supply. All-analog circuitry means highest energy efficiency.

Hot Receiver: 1.5-dB NF preamp and active-DBM front end dig deep into the noise to capture weak ones. If a signal is there, you'll hear it.

Excellent Selectivity: Sharp 2.3 KHz HF-style SSB ladder filter reduces passband noise, fights QRM, and improves intelligibility of a weak signals.

TVI Protection: Built-in 7-element lowpass filter knocks down TVI--lets you operate day or night, when you want to!

Optional Semi-QSK CW Module: Switch to USB-CW instantly--without changing modes, sidebands, or fiddling with the RIT. Just grab your key and start sending!

Real S-Meter: Steer your beam with pin-point accuracy--and give meaningful reports-with a full-sized analog S-meter. Also monitors speech processing level.

Agile Tuning: No tuning-rate shifts or stair-stepping! Reduction-drive analog VFO lets you scan for signals quickly, then zero in smoothly.

Loud Audio: Take your MFJ-9406 mobile. Powerful Phillips BTL-type audio IC and ruggedized 3-1/2" top-mounted speaker overcome ambient noise.

Amplifier Jack: Solid-state FET switch keys amplifiers such as Mirage A-1015-G.

Built to Last: Conservative design, premium G-10 plate-through pc board, quality

components, handsome brushed-aluminum panel, and tough vinyl-clad case make for years of dependable service.

At home--or roving the countryside--you'll enjoy superb six-meter performance with your

MFJ-9406. Best of all, it's fully backed by MFJ's exclusive NO MATTER WHAT

one-

year guarantee. If it breaks, we'll take care of it.

MFJ-9406 Instruction Manual

General Description:

The MFJ-9406 10-Watt PEP USB/CW transceiver is especially designed for fixed or portable radio communication in the six-meter amateur band. This unit operates from light-duty power sources such as NiCd battery packs or portable AC packs. Energyefficient analog circuitry and syllabic RF speech processing deliver superior on-air performance while conserving valuable power. The MFJ-9406 uses a single-conversion mixing format and a heterodyne VFO for enhanced weak-signal performance. The transmitter features a built-in 7-element lowpass filter to reduce interference at TV and FM-broadcast entertainment frequencies. Other features include a sharp HFcommunication grade crystal IF bandpass filter , built-in heavy-duty speaker, fully-analog mechanical S-meter, optional semi-break-in CW module, and intuitive "easy-to-operate" controls.

Typical Specifications:

Receiver Section:

Frequency Coverage: 50.000-50.300 MHz Receiver Type: Single-conversion Superhet Frequency Control: Heterodyne VFO, low-side injection IF Frequency: 10 MHz IF Selectivity: -6 dB @ 2.5 KHz AGC: Audio-derived, 70-dB dynamic range Sensitivity: .15 uV for 12-dB S/N Audio: 1-Watt into 8 Ohms at 10% THD Average Rx Current: 60-mA, (S-meter lamp disabled)

Transmitter Section:

RF Power Output: 10-Watts PEP VSWR Tolerance: 3:1 VSWR maximum Peak Tx Current: 2.0 A Speech Enhancement: RF-compression, syllabic rate Spurious Attenuation: 60-dB CW Generation: 600-Hz tone (optional generator) Mic Input: 600-Ohm dynamic

MFJ-9406 Instruction Manual

Quick-start Operating Instructions:

• Power Supply: You may use any well-filtered 13.8-Volt, 2-Amp supply or 10 D-

Cell NiCd pack to power your radio. The MFJ-9406 will also work with 12-Volt sources at reduced RF output. Use a 5.5 OD x 2.1 mm coaxial power plug to

connect your supply to the radio (Radio Shack 274-1569): [+] lead goes to the center pin of the connector.

• Microphone: The MFJ-290 dynamic mobile microphone complements your radio's

speech processor. RadioShack's 21-1172 replacement CB mic also plugs in without modification. To adapt other microphones, install a 5-pin DIN connector (RadioShack 274-003) as shown below. Your PTT switch must cut both mic line

and PPT line during receive (see below).

Pin 3 = PTT Line Pin 4 = Mic Line Pin 1,2,5 = Ground

Mic

PTT

Gnd

Never use amplified mics with your MFJ-9406--they will overdrive the processor.

•••• Antenna: The MFJ-9406 works well with any 50-Ohm six-meter antenna exhibiting

a VSWR of 2:1 or less. Avoid antennas with unknown or high VSWR. Horizontal polarization is normally used for six-meter SSB in most parts of the U.S. Feed with low-loss 50-Ohm coaxial cable and use a short direct feedline to prevent loss. A simple dipole is adequate for local contacts, but a 3-5 element directional Yagi yields vastly superior long-distance performance.

•••• Speech Processing: The MFJ-9406 has a built-in syllabic speech processor. For best

results, hold the mic about 1" from your lips and speak normally--the S-meter should deflect about 1/2 scale as you speak. When operating in noisy locations, you may reduce unwanted background noise by turning down the screwdrive-adjust mic gain control located on the radio's rear panel. Normal gain setting is 12:00.

•••• Connecting a Power Amplifier: Your radio has a built-in amplifier switch. This

feature provides a ground path during transmit to key an external RF-power amplifier such as the Mirage A-1015-G or A-1030-G. To use this feature, connect a RCA-type patch cable from the EXT AMP jack on the back panel to your amplifier's key jack. Also, connect the appropriate RF patch cable from the MFJ-9406 ANTENNA jack to the amplifier's input jack. Be sure to follow all manufacturer's instructions and suggestions during installation. Amplifiers must be able to handle 10-Watts PEP of drive, and must be specifically designed for SSB (linear) service.

MFJ-9406 Instruction Manual

MFJ-9406 Control Location and Function:

OFF

MIC

KEY

50.1

50.0

MFJ-SIX-METER SSB TRANSCEIVER

50.2

MODEL MFJ-9406

VFT VOLUME

50.3

FRONT PANEL

1. S-METER: Measures signal strength on receive, ALC on transmit

2. POWER SW: Applies DC power to the radio.

3. MIC JACK: Accepts 5-pin DIN connector for PTT microphone.

4. TX LED: Illuminates when transmitter is keyed.

5. KEY JACK: Accepts telegraph key--used with CW adapter module.

6. VFO TUNE: Tunes in stations, indicates operating frequency.

7. VFT: Fine tune control to assist with precise SSB tuning.

8. VOLUME: Adjusts listening level.

MFJ Enterprises, Inc Starkville, MS USA

Antenna

Mic Gain

Ext Amp Pwr

12-14 VDC

REAR PANEL

1. MIC GAIN: Adjusts speech-amp gain (normal setting 12:00).

2. EXT AMP: Keys linear amplifiers such as Mirage A-1015-G

3. POWER JACK: 5.5mm OD, 2.1mm ID, [+] to center pin.

4. ANTENNA: SO-239 for standard 50-Ohm coaxial plug.

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