MFJ-9412 Instruction Manual
12-Meter SSB Transceiver
2
INTRODUCTION
Congratulations on your choice of the MFJ-9412 Twelve-Meter SSB Transceiver. Please
read the whole 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 microprocessors, no booting up -- just turn it on and tune in!
Potent Signal:
Exclusive
Constant Current
TM
syllabic speech processing adds 4 to 6 dB
of intelligibility to your signal to cut through noise, fading, and QRM.
Low Drain:
Operate from a 3-Amp AC supply or 12-Volt battery. All-analog circuitry
means high energy efficiency!
Hot Receiver:
Low-noise preamp and active-DBM front end dig deep into the noise
floor to capture the weak ones. If the signal's there, you'll copy it.
Excellent Selectivity:
Sharp 2.4 KHz wide 10-MHz SSB ladder filter reduces passband
noise, fights QRM, and improves transmitter intelligibility.
Great Suppression:
Multiple tuned circuits and a 7-element lowpass filter keep your
signal clean and free 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 special BTL audio amplifier IC paired with a rugged 3-1/2" top-
mount speaker deliver robust audio with unusual clarity.
Phone Jack:
1/4" jack accepts stereo or monoral headphones and cuts off the speaker
automatically. Attenuated output protects your ears and makes gain adjustment easy.
Amplifier Jack:
Solid-state FET switch with a RCA jack to key an external amplifier.
Built to Last:
You get conservative design paired with quality components and a
premium-grade SMT pc board -- all protected by a tough aluminum case and capped with
a handsome stainless steel front panel. Built tough for years of dependable service.
At home or traveling the world, you'll enjoy superb 12-meter performance with your
MFJ-9412. Best of all, it's fully backed by MFJ's exclusive
NO MATTER WHAT
TM
one-
year guarantee. If it breaks, we'll take care of it.
GENERAL DESCRIPTION
