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does not try to boost when below the Enable Low Limit and above the Input Low Limit check 
the programming to insure the programming is correct. 

Minimum Battery Voltage 

According  to  battery  manufacturers  vehicle  batteries  are  normally  considered  drained  at  11.6V 
with no load.  Under load the voltage will be a little lower. Below about 9-10V the voltage will 
drop  fast  with  any  load.  The  battery  life  may  suffer  and  the  vehicle  may  not  start  when  the 
battery is that low. 

http://www.eetimes.com/author.asp?section_id=36&doc_id=1320644

 

Noise Reduction 

Although every effort was made to reduce switching noise RF noise is a possibility.  To reduce 
noise to a minimum ground the case of the MFJ-4418 to the automotive chassis with as short of a 
wire  or  grounding  braid  as  possible.  Clamp  on  ferrite  beads  can  be  used  on  the  input  and  out 
power leads to further reduce noise. 1 or 2 turns through the bead will help. 

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, MS 39759 

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. 

Available Accessories: 

MFJ-4416BRC Remote Control 
MFJ-5262 CAT5E cable 

Radio Power Cables: 

MFJ-5112, MFJ-5112M   Yaesu, Kenwood, Icom VHF/UHF 
MFJ-5535, MFJ-5535M   Yaesu, Kenwood, Icom HF 
MFJ-5538, MFJ-5538M   Yaesu 4 pin HF 

Содержание MFJ-4418

Страница 1: ......

Страница 2: ...10 THEORY OF OPERATION 13 Input Filtering 13 SMPS controller 14 MOSFET drivers and transformer 14 Output Filtering 14 Over voltage Protection 14 IN CASE OF DIFFICULTY 15 Low Voltage Disconnect trips u...

Страница 3: ...418 gives you a choice of Anderson PowerPoleTM connectors or 5 way binding posts on the input and output Software Managed Adjustments The user through MFJ software can adjust the output voltage measur...

Страница 4: ...nd output cables MFJ has cables available for the output side for use with most HF and VHF UHF radios 2 Prior to connecting the radio and battery plug the input and the output cables in to the MFJ 441...

Страница 5: ...View 1 5 Way High Power Binding Post Negative Input 2 Anderson PowerPoleTM Input 3 5 Way High Power Binding Post Positive Input 4 5 Way High Power Binding Post Positive Output 5 Anderson PowerPoleTM...

Страница 6: ...remote devices 7 USB The port to connect a computer for setting up the MFJ 4418 and monitoring the MFJ 4418 functions Not shown on the back side there is a ground lug available for chassis grounding C...

Страница 7: ...ly through the EXTERNAL BOOST ENABLE connector allowing the unit to be enabled a number of ways including the ignition line and the radio amplifier key line There are a total of 4 control lines Two wi...

Страница 8: ...oltage See Programming the MFJ 4418 section This mode does not require any connections to the radio and does not require the Boost Enable switch to be pushed in Any external connections or the Boost E...

Страница 9: ...incoming voltage to 13 8V when enabled for any voltage between the minimum voltage and 13 8V If the incoming voltage is above what the output voltage is set to the output voltage will rise to the inc...

Страница 10: ...ndows 10 i The default USB driver used by Windows 10 will work with the MFJ 4418 There is no need to run the MFJ 4418 Driver Installer program ii You can do a driver update by going to the Control Pan...

Страница 11: ...power is interrupted prior to closing the USB port the changes will be lost d Input Voltage Output Voltage and Output Current These displays are updated every second and display in volts and amps e IN...

Страница 12: ...the Enable High Limit is greater than the Enable Low Limit l Electronic Fuse This selects either fast or slow blow operation In fast blow the delay time is 1 10 second and in slow blow the delay time...

Страница 13: ...nd Average Current Display It does not reset any other functions THEORY OF OPERATION Figure 10 Block Diagram Input Filtering The input filter consists of C13 which provides EMI filtering followed by L...

Страница 14: ...the next power up cycle before the control IC takes control of the gate usually destroying one or both MOSFETs Output Filtering The output filter consists of toroid inductor L2 with capacitors C14 thr...

Страница 15: ...e power is removed The high current led will blink indicating a high voltage fault occurred The CPU monitors for overcurrent and will shut down the power and boost function should the output current e...

Страница 16: ...further reduce noise 1 or 2 turns through the bead will help TECHNICAL ASSISTANCE If you have any problem with this unit first check the appropriate section of this manual If the manual does not refer...

Страница 17: ...Schematics Figure 11 SMPS Section Schematic...

Страница 18: ...Figure 12 Control Section Schematic...

Страница 19: ...Figure 13 CPU Section...

Страница 20: ...of of purchase and a personal check cashiers check or money order must be provided to cover postage and handling Postage and handling may vary according to the weight of the product in question We als...

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