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-

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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