MFJ MFJ-2912 Manuale utente
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 2009 MFJ ENTERPRISES, INC.
C
Model MFJ-2912
VERSION 1A
MFJ-2912 Instruction Manual Wall-Mount Balun
3
MFJ-2912 Wall-Mount Balun
Introduction
The MFJ-2912 is a wall-mounted 1:1 balun that keeps RF current
traveling on the outside surface of coax cables away from station
equipment and internal house wiring. It also prevents electrical
noise generated in the building from migrating up to the antenna
feedpoint and raising the receiver noise floor. The wall-mount
packaging provides a convenient disconnect point for lightning
protection. Disconnecting the antenna from the building is the
most effective method for preventing equipment damage from on-
site lightning strikes. Bottom-mounted SO-238 connectors keep
rain away from coax connections and all-stainless hardware
ensure maximum durability plus long product life.
The MFJ-2912 mounts on the exterior wall of your building to keep
RF out of the shack and away from internal house wiring. It also
prevents electrical noise generated in the building from migrating
up to the antenna feedpoint and raising your receiver’s noise floor.
The toroid-style transmission-line choke is rated for maximum
legal power on SSB and CW, and it delivers an impressive 30+ dB
of through-transmission (S21) common-mode isolation on 80-10
meters. The exterior wall-mount package also provides a
convenient disconnect point for lightning protection. The MFJ-
2912 uses premium-grade SO-238 connectors that are mounted
on the bottom surface of the enclosure to keep rain away from
coax connections. All-stainless hardware and rugged components
ensure maximum durability plus long product life.
MFJ-2912 Instruction Manual Wall-Mount Balun
4
General Installation
For typical residential applications, use the two wood screws
provided for mounting the balun. Brick, masonry, or stucco
surfaces will require purchasing and installing wall anchors made
for the particular construction material used. Stainless-steel sheet-
metal screws are recommended for mounting on metal buildings
or utility boxes. RF Input and output connections are
interchangeable. However, do not tie the two coax connectors
together with a common ground wire, as this will bypass the balun
and render it ineffective.
Important Note: Always mount with the connectors facing
downward to ensure maximum protection from water incursion.
Specifications:
Impedance: 50 Ohms
Frequency Range: 1.5 – 50 MHz
Power Rating 1.5 kW PEP, SSB and CW (de-rate
50% for RTTY)
MFJ-2912 Instruction Manual Wall-Mount Balun
5
Schematic Diagram:
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-
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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