MFJ MFJ-4403 User Manual
Transceiver
Voltage Conditioner
Model MFJ-4403
VERSION 0A
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 2 00 6 MFJ ENTERPRISES, INC.
C
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MFJ-4403 Transceiver Voltage Conditioner Instruction and Technical Manual
DISCLAIMER
Information in this manual is designed for user purposes only and is not intended to
supersede information contained in customer regulations, technical manuals/documents,
positional handbooks, or other official publications. The copy of this manual provided to
the customer will not be updated to reflect current data.
Customers using this manual should report errors or omissions, recommendations for
improvements, or other comments to MFJ Enterprises, 300 Industrial Park Road,
Starkville, MS 39759. Phone: (662) 323-5869; FAX: (662) 323-6551. Business hours:
M-F 8-4:30 CST.
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MFJ-4403 Transceiver Voltage Conditioner Instruction and Technical Manual
TABLE OF CONTENTS
TOPIC PAGE
1. TABLE OF CONTENTS 2
2. LIST OF FIGURES AND TABLES 2
3. INTRODUCTION AND FEATURES 3
4. SYSTEM CONTROLS AND INDICATORS 4
5. THEORY OF OPERATION 6
5. EASY-START INSTRUCTIONS 6
7. OPERATION 7
8. IN CASE OF DIFFICULTY 9
9. TECHNICAL ASSISTANCE 10
LIST OF FIGURES
Figure 1 Front Panel Jacks and Controls 4
Figure 2 Rear Panel Jacks and Controls 5
Figure 3 Block Diagram 6
Figure 4 Schematic 8
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MFJ-4403 Transceiver Voltage Conditioner Instruction and Technical Manual
INTRODUCTION & FEATURES
The MFJ-4403 Transceiver Voltage Conditioner was designed for the ultimate
transceiver protection from even non-ideal voltage sources, which can cause major
damage to radios and other equipment. This makes the MFJ-4403 particularly valuable
for DXpeditions, mobile and portable operation. And even in the home, the MFJ-4403
provides protection from any potential power supply problems due to transients and noise
induced on your transceiver’s DC input by any AC or RF anomalies. With this in mind
the MFJ-4403 provides the following protection to your equipment:
REVERSE POLARITY PROTECTION – If you accidentally reverse your input
voltage connection, the bright red REVERSE POLARITY LED will alert you to this fact.
And even if the MFJ-4403 is on during this condition, no damage will occur to the MFJ4403 or your equipment!
TRANSIENT SUPRESSION – Heavy duty transient suppressor clamps input transients
to 15 volts and handles over 200 amps peak current to protect your equipment from
vehicle start-up voltage spikes, and poorly regulated power supply transients.
SHORT CIRCUIT PROTECTION – Input and output fuses instantly protect you from
short circuit conditions. Automotive Blade fuses are utilized for easy replacement.
NOISE AND RIPPLE FILTERING – A capacitor bank consisting of over 4 Farads of
ultra high-value capacitors filter off virtually all power supply noise and ripple. This
capacitor bank provides enough power supply buffering that even under-rated and
marginal power supplies and wiring can run your HF transceiver. You can even run a
full 100 watt SSB transceiver from your automotive cigarette lighter (accessory) socket
for temporary mobile applications.
RUGGED CONSTRUCTION - Attractive all-metal cabinet and conservative
component selection ensures solid performance for years to come. Fully covered by
MFJ’s “No Matter What” one year limited warranty.
Before attempting to operate your MFJ-4403, please read this manual thoroughly. It
contains important detail about setting up your unit to obtain the best performance.
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MFJ-4403 Transceiver Voltage Conditioner Instruction and Technical Manual
SYSTEM CONTROLS AND INDICATORS
Front Panel Controls:
1 2 3 4
Figure 1: MFJ-4403 Front Panel Controls
1. Reverse Polarity LED: This Red LED indicates that the input voltage applied to the
unit is connected backwards. No damage will occur to the MFJ-4403 or any connected
equipment. However - Correct this situation immediately.
2. Charging LED: This Yellow LED indicates the capacitor bank is in initial charging
mode. Do not power on your radio unit this LED extinguishes.
3. Power LED: This green LED indicates that power is applied to the unit and the unit
has been turned on. When the MFJ-4403 is turned off this LED remains illuminated until
the capacitor bank discharges.
4. On/Off: Enables or disables the MFJ-4403. When turned off, no current is drawn
from the voltage source by the MFJ-4403 or any connected equipment. And when turned
off, the MFJ-4403 provides an internal bleeder resistor to safely discharge the capacitor
bank in about one minute.
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