MFJ-852 Instruction Manual
AC Line Noise Meter
1
INTRODUCTION
Congratulations on purchasing the MFJ-852 AC Line Noise Meter. Like
professional RFI trackers used by utility companies, your MFJ-852 leads you to
trouble spots fast. Here are some important features:
VHF Design:
The MFJ-852 operates at 135 MHz where antenna length is short,
on-air interference is minimal, and RFI is localized easily for accurate tracking.
Wideband IF:
100 kHz IF bandwidth provides optimized noise sampling.
1 uV Sensitivity:
Picks up all noise signatures, weak or strong.
Semi-Log Metering:
Semi-log metering system covers a wide signal range
without the need for add-on step attenuators.
Balanced Antenna:
Built-in collapsible dipole is decoupled from case
electronics and headphone leads to deliver a clearly-defined null. Locates RFI
sources easily.
Audio Jack:
Plug in stereo or mono type headphones for audible monitoring, or
connect a portable cassette recorder to make sound recordings for later analysis.
Many powerline faults have identifiable noise signatures 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 battery
before
the meter stops working
properly.
Tracks Many Types of RFI:
In addition to transmission line noises, the MFJ-
852 also ferrets out residential and industrial noise sources such as electric fence
arcs, sparking power equipment, poorly suppressed specialty lighting, and much
more. Give your claims added credibility by showing the owners of defective
equipment where the problem is being generated--and letting them hear what it
actually sounds like!
Fully Portable:
Compact hand-held size and built-in battery power let you to
explore freely in search of trouble spots.
Always Available:
Many power-related noise problems are intermittent and
rarely occur when power company engineers are in the neighborhood with the
RFI truck. With the MFJ-852, you can capture the data you need instantly--
when its happening!
Be a detective and put the fun back into Ham Radio! In addition to solving
problems in your own neighborhood, this is a great way to lend assistance to
friends or fellow club members who are having problems of their own. When
