MFJ MFJ-852 Instruction Manual Download Page 8

MFJ-852 Instruction Manual 

AC Line Noise Meter 

Erratic Operation:

  Check battery condition--is LED illuminating? 

Chronic Interference from Aircraft or Wx-Satellite Signals:

  Retune L3 

slightly.  

Noisy or Intermittent Audio: 

 Check headphone wires, plug. 

 

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 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 technicians may ask. 

You can also send questions by mail to MFJ Enterprises, Inc., 300 Industrial 
Park Road, Starkville, MS 39759; by Facsimile 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. 

 

Summary of Contents for MFJ-852

Page 1: ...res that experienced powerline technicians can identify easily even over the phone Battery Indicator LED power indicator also monitors battery status let s you know when it s time to replace the batte...

Page 2: ...50 dB semi log response Receiver IF Bandpass 100 kHz Audio Output Fixed headphone level line level for record Power Source Self contained 9 volt flatpack battery Current Drain 30 mA Antenna Choke bal...

Page 3: ...comes from arcing or corona Arcing or sparking happens when 60 Hz AC swings to its extreme plus or minus value This can induce voltage in associated wiring and hardware that arcs across an imperfect i...

Page 4: ...is pointed at the source If possible get out from under overhead wires and well off to one side to pinpoint source When you think you ve isolated the source write down the pole number Occasionally th...

Page 5: ...th utility poles and powerline transmission equipment We ve all heard grizzly tales of the old timer who bashed a pole with a sledge hammer or shook guy wires violently to cure his noise problem Pleas...

Page 6: ...ned ear of a utility company specialist may prove helpful in making a positive identification even if it s not their equipment causing the problem Honey Works Better than Vinegar Most commercial or re...

Page 7: ...in strength A diode AM detector simultaneously demodulates noise signals and generates a DC level for AGC control This composite energy is amplified by op amp U3a The AF component is routed to the rec...

Page 8: ...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 inf...

Page 9: ...MFJ 852 Instruction Manual AC Line Noise Meter 9 SCHEMATIC...

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