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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
TM
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-
TM
year guarantee. If it breaks, we'll take care of it.
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Summary of Contents for MFJ MFJ-9406
- Page 1 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.
- Page 2 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. Energy- efficient analog circuitry and syllabic RF speech processing deliver superior on-air performance while conserving valuable power.
- Page 3 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.
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Page 4: Front Panel
MFJ-9406 Instruction Manual MFJ-9406 Control Location and Function: MODEL MFJ-9406 50.1 50.2 VOLUME 50.0 50.3 TX KEY MFJ-SIX-METER SSB TRANSCEIVER FRONT PANEL 1. S-METER: Measures signal strength on receive, ALC on transmit 2. POWER SW: Applies DC power to the radio. - Page 5 MFJ-9406 Instruction Manual Six-meter Antenna Systems: The better your antenna system works, the more you will enjoy using your MFJ-9406. Here are some tips for selecting and getting top performance from your antenna • • • • Antenna: Most six-meter SSB stations use horizontally-polarized Yagi antennas with 3 to 5 elements.
- Page 6 MFJ-9406 Instruction Manual The Magic Band: Six meters is a great band for every-day point-to-point local communication. However, six earned its reputation as "the magic band" because of the many exotic forms of skip that support long-distance communication. Here are some of the propagation modes you'll encounter as you operate this band: •...
- Page 7 General: The MFJ-9406 is a 10-Watt PEP SSB transceiver that tunes from 50.0-50.3 MHz. The radio's single-conversion format uses a 10-MHz IF and a heterodyne 40-MHz VFO for low phase noise and circuit simplicity. The MFJ-9406 is designed for fixed, portable, or mobile operation from light-weight power sources, and uses analog circuitry throughout for low power consumption.
- Page 8 TRANS DRIVER DRIVE MFJ-9406 Internal Adjustments: (see pictorial on page 9) [1] Voltage Regulator: Adjust V-REG trimpot R78 for 10.5V on tab of U9 [18]. [2] RSSI Threshold: Adjust AGC trimpot R11 for 4.3 V at RSSI test point [16].
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Page 9: Important Warning
It's far better to contact the MFJ factory for assistance. Mis-alignment may cause permanent damage to your unit, and may result in interference to other radio services in violation of FCC rule. MFJ cannot be held responsible for the performance of radios that have been improperly tampered with or mis- adjusted by owners and users. - Page 10 MFJ-9406 Instruction Manual Trouble Shooting:...
- Page 11 If the manual does not reference your problem or your problem is not solved by reading the manual, you may call MFJ Technical Service at 601-323-0549 or the MFJ Factory at 601-323-5869. You will be best helped if you have your unit, manual and all information on your station handy so you can answer any questions the technicians may ask.
- Page 12 MFJ-9406 Instruction Manual Schematic goes here Notes:...
- Page 13 MFJ-9406 Instruction Manual...
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