MFJ MFJ-4416B User manual

INSTRUCTION MANUAL
CAUTION: Read All Instructions Before Operating Equipment
MFJ ENTERPRISES, INC.
300 Industrial Park Road
Starkville, MS 39759 USA
Tel: [phone] Fax: [phone]
COPYRIGHT 2006 MFJ ENTERPRISES, INC.
C
Model MFJ-4416B
VERSION 1A

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MFJ-4416B Super Battery Booster Instruction and Technical Manual
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TABLE OF CONTENTS
TOPIC PAGE
1. TABLE OF CONTENTS 2
2. LIST OF FIGURES AND TABLES 2
3. INTRODUCTION AND FEATURES 3
4. TYPICAL SPECIFICATIONS 4
5. SYSTEM CONTROLS AND INDICATORS 5
a. TOP INPUTS AND OUTPUTS 5
b. SIDE PANEL CONTROLS AND INPUTS 6
6. INTERNAL HEADER AND VOLTAGE CONTROL 7
7. THEORY OF OPERATION 8
8. TYPICAL EFFICIENCY 9
5. MFJ-4416B EASY-START INSTRUCTIONS 10
6. IN CASE OF DIFFICULTY 11
7. TECHNICAL ASSISTANCE 11
LIST OF FIGURES
Figure 1 Top Inputs and Outputs 5
Figure 2 Side A Controls and Indicators 6
Figure 3 Side B Jack 6
Figure 4 Internal Headers and Voltage Adjust 7
Figure 5 Block Diagram 8
Figure 6 Schematic Diagram 12

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INTRODUCTION & FEATURES
INTRODUCTION
The MFJ-4416B Super Battery Booster is designed with the serious mobile operator in
mind. In the mobile environment low battery voltage can cause output signal distortion,
output power problems and even transceiver resetting. This low voltage occurs in two
ways. First – even low resistance wiring can result in noticeable voltage drop. And
second when you turn off your vehicle or remove a typical battery from the charger, the
battery voltage can drop from the nominal 13.8 volts to 12 volts after a short period of
time. With this in mind the MFJ-4416B Super Battery Booster corrects all of these
problems. With its high efficiency boost regulator circuitry, it will maintain the desired
13.8 volts at up to 25 amps peak from voltages as low as 9 volts.
FEATURES
Choice of Input and Output Connections: No need to fumble around looking for
connectors. The MFJ-4416B gives you a choice of Anderson PowerPoleTM connectors or
5-way binding posts on the input and output.
Adjustable Output Voltage: User adjustable output voltage. Factory set at 13.8 volts
this voltage is adjustable anywhere from 12 to 13.8 volts. When setting the voltage at 12
volts, input voltages greater than 12 volts pass through, but the efficiency is greater.
Typically saving over 30 watts in heat dissipation during transmit.
Selectable Minimum Input Voltage: You have the choice of the minimum input
voltage the MFJ-4416B will operate on. Set from the factory at 10 volts you can select 9
or 11 volts. This keeps you from possibly over discharging your battery and damaging it.
It is even latchable so once the voltage drops the Boost Regulator stop until you remove
the power from the unit.
Audio Alert Feature: When enable instantly alerts you when the input voltage drops
below the preset level.
RF Sampling Port: Feed RF from your radio’s antenna line with a “T” connector and
the unit will automatically sense when the high current demands of transmitting are
required so no regulator switching efficiency penalties are incurred during receive.
Adjustable RF Delay: Adjustable Delay Circuit. Adjust from .1 to 10 seconds delay
after removal of RF from the circuit. Great when using the MFJ-4416B for different
modes of operation.
Remote Jack: Allows sampling of the Input Voltage and the Output Voltage. Also
allows for control of the Boost Switch and has an active low output for the Low voltage
alarm. Direct connection to the MFJ-4416RC Remote Unit.

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MFJ-4416B Super Battery Booster Instruction and Technical Manual
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RUGGED CONSTRUCTION - Attractive all-metal cabinet, conservative component
selections ensure solid performance for years to come. Fully covered by MFJ’s “No
Matter What” one year limited warranty.
TYPICAL SPECIFICATIONS
Output Current…………………………25 Amps Peak
Output Voltage …………………………13.8 Volts at 9-13.8 volts input.
Before attempting to operate your MFJ-4416B, please read the manual thoroughly. It
contains important details about setting up your unit to obtain the best performance.

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SYSTEM CONTROLS AND INDICATORS
Top Inputs and Outputs:
Figure 1: MFJ-4416B Top Inputs and Outputs
1. 5-Way High Power Binding Post Negative Input.
2. Anderson PowerPoleTM Negative Input.
3. Anderson PowerPoleTM Positive Input.
4. 5-Way High Power Binding Post Positive Input.
5. 5-Way High Power Binding Post Positive Output.
6. Anderson PowerPoleTM Positive Output.
7. Anderson PowerPoleTM Negative Output.
8. 5-Way High Power Binding Post Negative Output.

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SYSTEM CONTROLS AND INDICATORS
Side A Controls and Indicators:
1 2 3
Figure 2: MFJ-4416B Side A Controls and Indicators
1. Enable/Disable: This switch allows the RF Sense feature to be disabled. When in
the Enabled position the Switching Regulator is always on.
2. Enabled LED: This LED is illuminated when the Switching Regulator is enabled
either through the RF Sense feature or the Enabled/Disabled Switch is in the Enabled
position.
3. Low Battery LED: The LED Illuminates the low voltage trip threshold has been
crossed. If the latching feature is enabled the MFJ-4416B must be removed from the
input voltage source and allowed to discharge to reset the cutout.
Side B Controls and Indicators:
1 2
Figure 3: MFJ-4416B Side B Jacks
1. Remote Jack: This Jack allows the MFJ-4416BRC Remote Control and metering
unit to be attached to the MFJ-4416B. This allow remote monitoring of the Input
Voltage, Output Voltage. It also allow Remote Enabling and Audible alarm of the MFJ-
4416B. Perfect for remote placement of the MFJ-4416B.2. RF Enable Jack: This Jack
allows RF to be fed from your transceiver. It will sense the RF and turn the Boost
Regulator on and off. This will help conserve power during receive when the boost is
often not necessary.

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INTERNAL HEADER AND CONTROL
Figure 4: MFJ-4416B Internal Header and Voltage Control
Input Voltage Cutout: This is where you set the input voltage cutout. Default is 10
volts when jumpered across 3-4. To set the cutout at 11 volts move this jumper to 5-6.
For 9 volts cutout move this jumper to 1-2.
Voltage Adjust: This trimpot sets the output voltage. Set from the factory at 13.8 volts
this level is adjustable from 12 to 13.8 volts.
Audio Alert Enable: This jumper enables the audio alert. Any time the voltage drops
below the level set by the input voltage cutout you will be alerted by the Piezo buzzer.
To disable remove the jumper.
Cutout Latch: When jumpered the Boost Regulator IC will be shutdown anytime the
voltage drops below the level set by the Input Voltage Cutout. It will remain shutdown
until the input voltage is removed from the unit. Default not jumpered.
RF Sense Delay: This Trimpot sets the RF sense Delay. Factory set at approximately 5
seconds it is adjustable from about .1 to 10 seconds.
Remote Jack: This is where the MFJ-4416RC is connected.

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THEORY OF OPERATION
Figure 5: MFJ-4416B Block Diagram
Refer to Figure 3 and the schematic Figure 6 for the discussion of the theory of operation.
The input voltage passes through an input filter consisting of L3 and three 4700 uf
capacitors. This helps keep switching transients from appearing on the input line of the
unit. This filtered positive voltage is then fed to the center tap of the primary and the
secondary of the switching toroidal transformer L1. When the unit is disabled this
voltage appears on the output of the unit less the voltage drop across the dual diode D1.
When enabled the secondary voltage of the toroidal transformer is the input voltage plus
the voltage of the transformer primary windings. By doing it this way the transformer
only needs to supply the difference of the output voltage and the battery voltage. This
reduces the power requirements of the transformer and switching FETs. The output is
then rectified by the Dual Diode D1. Output filtering consists of L2 and six 4700 uf
capacitors. This 28,200 uf of output filtering helps ensure the output is clean from
switching transients. The output is protected by a crowbar circuit consisting of a 15 volt
zener diode D7 and the SCR D6. When a voltage higher than 15 volts is sensed, the SCR
is triggered shorting the output to ground to protect your equipment from damage in the
event of a problem. There are 2 inputs for enabling the unit. The first is a simple switch
that turns the unit on and allows it to continuously run. The second is a RF switch

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THEORY OF OPERATION
consisting of rectifier diodes D2 and D3 that sample the RF being fed to the unit. When
the RF is sensed then the switch consisting of Q7 and Q6 turn on to take the Enable Input
of the regulator IC low turning it on. The last section of the MFJ-4416B is the Low
Voltage Detection circuit. This circuit uses on of three selectable voltage dividing
resistors to sample the input voltage. When the voltage drops below a pre-determined
level it takes the comparator’s output high. If the jumper is placed on the Latching
Header then this high level is then inverted and fed back into the input of the comparator
which holds the comparators output high. Reset of the low voltage disconnect is
accomplished by disconnecting the input voltage.
Typical efficiency at +13.8VDC output and +12VDC output are shown in the tables
below.
Typical Efficiency – Output set to +13.8V
Vin Iin Vout Iout Eff
13.0 27.8A 13.8V 24.00 92%
12.0V 30A 13.8V 24.00 90%
12.5V 20A 13.8V 17A 94%
12.5V 25A 13.8V 21A 91%
11.5V 23A 13.8V 17A 91%
11.5V 27A 13.8V 21A 93%
*11.2V28A 13.8V 21A 92%
10.5V 26.5A 13.8V 17A 90%
10.0V 20.2A 13.8V 13.8A 94%
*Limited by the input 30-amp fuse
Typical Efficiency – Output set to +12V
Vin Iin Vout Iout Eff
14V 21.5A 12.9V 22.5A 96%
13V 22.5V 12.1V 21A 87%
12V 24.5 12V 21A 86%
11V 27.9A 12V 21A 82%
10V 24.9A 12V 18A 87%

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MFJ-4416B Super Battery Booster Instruction and Technical Manual
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EASY START INSTRUCTIONS
1. Prepare input and the output cables for the MFJ-4416B. It is recommended to use #12
or larger wire for both the input and output cables. The MFJ-5535M cable is available
for the output side for use with most HF radios, and the MFJ-5512 M cable is available
for most VHF/UHF radios.
2. Prior to connecting the radio and battery, plug the input and the output cables in to the
MFJ-4416B and ensure the polarity is correct.
3. If using the RF sense feature, you need to tap into your antenna lead. Normally this is
accomplished with a UHF “T” connector. You will also need a cable to go from the “T”
connector to the MFJ-4416B. This cable should be less than 1/16th wavelength long at
your highest frequency of operation.
4. Plug the output of the MFJ-4416B into your radio and then attach the input to your
battery.
5. You are now ready to operate. If not using the RF sensed switching, depress
the enable switch.
IN CASE OF DIFFICULTY
[ ] Low Voltage Disconnect trips under high demand conditions. This can be caused by
2 things. First ensure your battery is charged. A discharged battery will recover voltage
under low current conditions, but once current is drawn it will immediately drop below
the cutout voltage. Second, ensure the wiring on the input side of the unit is adequate for
the current being drawn and the lengths of the cable run.
[ ] Enable LED fails to illuminate. Ensure that you are either feeding RF from the radio
into the unit or the Enable/Disable switch is depressed.
TECHNICAL ASSISTANCE
If you have any problem with this unit first check the appropriate section of this manual.
If the manual does not reference your problem or is your problem is not solved by
reading the manual, you may call MFJ Technical Service at 662-323-0549 or the MFJ
Factory at 662-323-5869. 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 technician may
ask.
You can also send questions by mail to MFJ Enterprises, Inc., 300 Industrial Park Road,
Starkville, MS39759; by Facsimile (FAX) to 662-323-6551; 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.

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Figure 6: Schematic Diagram

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LIMITED 12 MONTH WARRANTY
MFJ Enterprises, Inc. warrants to the original owner of this product, if manufactured by MFJ
Enterprises, Inc. and purchased from an authorized dealer or directly from MFJ Enterprises, Inc.
to be free from defects in material and workmanship for a period of 12 months from date of
purchase provided the following terms of this warranty are satisfied.
1. The purchaser must retain the dated proof-of-purchase (bill of sale, canceled check, credit
card or money order receipt, etc.) describing the product to establish the validity of the
warranty claim and submit the original or machine reproduction of such proof of purchase
to MFJ Enterprises, Inc. at the time of warranty service. MFJ Enterprises, Inc. shall have
the discretion to deny warranty without dated proof-of-purchase. Any evidence of
alteration, erasure, or forgery shall be cause to void any and all warranty terms
immediately.
2. MFJ Enterprises, Inc. agrees to repair or replace at MFJ's option without charge to the
original owner any defective product under warrantee provided the product is returned
postage prepaid to MFJ Enterprises, Inc. with a personal check, cashiers check, or money
order for $7.00 covering postage and handling.
3. This warranty is NOT void for owners who attempt to repair defective units. Technical
consultation is available by calling the Service Department at 662-323-0549 or the MFJ
Factory at 662-323-5869.
4. This warranty does not apply to kits sold by or manufactured by MFJ Enterprises, Inc.
5. Wired and tested PC board products are covered by this warranty provided only the wired
and tested PC board product is returned. Wired and tested PC boards installed in the
owner's cabinet or connected to switches, jacks, or cables, etc. sent to MFJ Enterprises,
Inc. will be returned at the owner's expense unrepaired.
6. Under no circumstances is MFJ Enterprises, Inc. liable for consequential damages to
person or property by the use of any MFJ products.
7. Out-of-Warranty Service: MFJ Enterprises, Inc. will repair any out-of-warranty product
provided the unit is shipped prepaid. All repaired units will be shipped COD to the owner.
Repair charges will be added to the COD fee unless other arrangements are made.
8. This warranty is given in lieu of any other warranty expressed or implied.
9. MFJ Enterprises, Inc. reserves the right to make changes or improvements in design or
manufacture without incurring any obligation to install such changes upon any of the
products previously manufactured.
10. All MFJ products to be serviced in-warranty or out-of-warranty should be addressed to:
MFJ Enterprises, Inc.,
300 Industrial Park Road
Starkville, Mississippi 39759 USA
and must be accompanied by a letter describing the problem in detail along with a copy of
your dated proof-of-purchase.
11. This warranty gives you specific rights, and you may also have other rights which vary
from state to state.