MFJ Enterprises Mfj-9410 10 Meter Ssb Transceiver Instruction Manual

MFJ-9410 Instruction Manual  10-Meter SSB Transceiver 
1 
INTRODUCTION 
 
Congratulations on your choice of the MFJ-9410 Ten-Meter SSB Transceiver.  Please 
read this manual carefully before attempting to operate your new radio.  Lets begin with 
an introduction to some special features we think youll like! 
 
Easy to Operate:  No microprocessor mumbo-jumbo.  Just turn on and tune in! 
 
Potent Signal:  20-Watt PEP--plus Constant Current
TM syllabic speech processing for an 
added 4 to 6-dB advantage to...

MFJ-9410 Instruction Manual  10-Meter SSB Transceiver 
2 
GENERAL DESCRIPTION 
 
The MFJ-9410 is a 20-Watt PEP USB transceiver designed especially for fixed or 
portable radio communication in the ten-meter amateur band.  Energy-efficient analog 
circuitry and syllabic speech processing deliver superior on-air performance while 
conserving valuable power.  The MFJ-9410 uses a single-conversion mixing format and a 
low-noise heterodyne VFO for enhanced weak-signal performance.  The transmitter 
features a...

MFJ-9410 Instruction Manual  10-Meter SSB Transceiver 
3 
QUICK-START OPERATING INSTRUCTIONS 
 
• 
Power Supply:  Use any regulated 13.8-Volt 3-Amp supply or comparably-rated 12-
Volt battery.  Connect power via a 5.5 OD x 2.1 mm coaxial power plug (Radio Shack 
274-1569): 
 [+] lead must be attached to the connector center pin. 
 
+
-
 
 
• 
Microphone:  The MFJ-290 dynamic microphone compliments your radios speech 
processor, but other 600-ohm PTT microphones may be used with a 5-pin DIN 
connector...

MFJ-9410 Instruction Manual  10-Meter SSB Transceiver 
4 
MFJ-9410 CONTROL LOCATIONS AND FUNCTION 
 
OFFMIC
TXKEYVOLUME MODEL MFJ-9410
28.3
28.4
28.5
28.6
1
2
34
58
FINE
TUNE
76
 
 
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--only used with CW adapter module. 
6. VFO TUNE:...

MFJ-9410 Instruction Manual  10-Meter SSB Transceiver 
5 
TEN-METER ANTENNA SYSTEMS 
 
The better your antenna system works, the more youll enjoy using the MFJ-9410.  Here 
are some general tips for getting top performance: 
 
•
•• • Antenna Selection:  Dipoles, ground-planes, and converted CB antennas all provide 
good performance for casual operation.  However, for serious DX hunting, a compact 
3-element yagi or 2-element quad will yield significantly better results.  Many compact 
directional...

MFJ-9410 Instruction Manual  10-Meter SSB Transceiver 
6 
 
General:  The MFJ-9410 is a 20-Watt PEP USB transceiver that tunes from 28.3-28.6 
MHz.  The radios single-conversion format uses a high-frequency heterodyne VFO for 
superior stability, low phase noise, and circuit simplicity.  The MFJ-9410 is designed for 
fixed or portable operation from light-weight power sources and uses all-analog circuitry 
throughout for reduced power consumption. 
 
Receiver:  A four-pole bandpass filter (L1/L2)...

MFJ-9410 Instruction Manual  10-Meter SSB Transceiver 
7 
MFJ-9410 BLOCK DIAGRAM 
 
U1
REC 
MXR
XTAL
FILU2
IF AMP
AGC Y1-6U3
PROD
DETQ5
GATEU4A
AF
PREAMPVOL
U5
AUDIO
AMP
AGC/ALC
AMP
Q2,3,4 M Q1
LNA
BPF
Q9
T/R
LPF
U7
BAL
MODQ8
GATEU4B
MIC
AMPQ7
FLRU6
VFO
MXRQ6
OSC BPF
Q12
PAQ11
DRIVERQ10
PRE
DRIVEU8
TRANS
MXR
ANT
TUNE
VFTU9
REG
10.5VU10
REG
5V
Q13
EXT
SW
 
 
MFJ-9410 INTERNAL ADJUSTMENTS
  (see pictorial on next page)
 
 
[1] Voltage Regulator:  Adjust V-REG trimpot R78 for 10.5V on tab of U9 [18]. 
[2]...

MFJ-9410 Instruction Manual  10-Meter SSB Transceiver 
8 
INTERNAL ADJUSTMENT LOCATIONS 
 
WARNING:  The tune-up information provided in this manual 
does not constitute a step-by-step guide for 
aligning the MFJ-9410.  IF YOU LACK THE TEST 
EQUIPMENT, KNOWLEDGE, AND SKILLS TO ALIGN HF SSB 
TRANSCEIVERS, DO NOT ATTEMPT TO MAKE THESE 
ADJUSTMENTS ON YOUR OWN!!  Far better to contact 
the MFJ factory for assistance.  Mis-alignment may 
cause permanent damage to your unit, and may 
result in interference to...

MFJ-9410 Instruction Manual  10-Meter SSB Transceiver 
9 
! Radio does not power up:  Check power plug and power supply.  Also, reverse-
polarity protection fuse may be open (etched on PC board in front of power jack J3).  If 
open, install a 3.0-A pig-tail replacement fuse or short length of #32 wire. 
!  No signals received:  Check antenna and feedline for breaks or shorts.  If okay, you 
should hear a clearly-audible increase in background noise when the antenna is 
connected. 
 
!  
Spurious signals...

MFJ-9410 Instruction Manual  10-Meter SSB Transceiver 
10 
You can also send questions by mail to MFJ Enterprises, Inc., 300 Industrial Park Road, 
Starkville, MS 39759; by Facsimile (FAX) to 601-323-6551; or by email to 
[email protected].  Send a complete description of your problem, an 
explanation of exactly how you are using your unit, and a complete description of your 
station. 
MFJ-9410 SCHEMATIC DIAGRAM