MFJ MFJ-918WM Bedienungsanleitung

MFJ-918WM, MFJ-2919WM, and MFJ-2920WM

1.5 kW, 1.8-30 MHz Wall-Mount Balun

Introduction: Without a balun, the outer surface of your coax shield provides a common-mode

path for transmitted RF to flow from the antenna down to your operating location. Here, it can

disrupt or damage sensitive electronics and, if severe, may even change the antenna's radiation

pattern, distort your transmit audio, or cause a painful RF burn. On receive, the process is

reversed, with stray locally generated carriers and "hash" traveling up the cable to the feedpoint

to raise the noise floor and cover weak signals.

Description: The MFJ-918WM, MFJ-2919WM, and MFJ-2920WM are designed to provide balun

protection at building entrances, on a tower, or on the boom of a directional antenna. Sturdy

insulated five-way binding posts secure antenna pigtails or open-wire line. The balun's weather-

proof enclosure-cover is made from UV-resistant black ABS and is attached to a sturdy aluminum

panel with a universal mounting bracket assembly. On the inside, high-permeability ferrite beads

are installed over RG-303 Teflon coax to ensure high power handling, maximum suppression,

and minimal signal loss. Coax is connected to a premium quality Teflon-insulated SO-239 and a

panel-mounted stud is provided for a ground connection.

Models:

[ ] MFJ-918WM: A 1:1 ratio 50-Ohm current balun designed to minimize losses and deliver

superior suppression over the entire HF range.

[ ] MFJ-2919WM: A 4:1 ratio transmission-line transformer style balun designed for 200-Ohm

loads.

[ ] MFJ-2920WM: A 9:1 ratio transmission-line transformer design for 450-Ohm applications.

Installation: The enclosure may be wall mounted, tower mounted, or installed on an antenna

boom. Where possible, always install with the black-ABS enclosure facing up for maximum

weather protection. When wall-mounting on an insulated surface such as wood, provide a

ground-rod for protection. It won't prevent catastrophic damage from a direct strike, but can save

equipment from damage induced by nearby hits. Mounting holes are provided for mounting the

enclosure to a building or support plate. These holes may be enlarged or new ones installed to

accommodate U-bolts.

Coax Ground

Antenna or

Balanced Line

Important Warning: To prevent accidental death or serious injury, never install an antenna

where it can contact power lines. Also, to prevent dangerous RF burns, keep energized

antenna surfaces out of reach to humans and animals.

LIMITED 12 MONTH WARRANTY

MFJ Enterprises, Inc. warrants to the original owner of this product, if manufactured by MFJ

Enterprises, Inc. and purchased from an authorized dealer or directly from MFJ Enterprises, Inc.

to be free from defects in material and workmanship for a period of 12 months from date of

purchase provided the following terms of this warranty are satisfied.

1. The purchaser must retain the dated proof-of-purchase (bill of sale, canceled check, credit

card or money order receipt, etc.) describing the product to establish the validity of the

warranty claim and submit the original or machine reproduction of such proof of purchase

to MFJ Enterprises, Inc. at the time of warranty service. MFJ Enterprises, Inc. shall have

the discretion to deny warranty without dated proof-of-purchase. Any evidence of

alteration, erasure, or forgery shall be cause to void any and all warranty terms

immediately.

2. MFJ Enterprises, Inc. agrees to repair or replace at MFJ's option without charge to the

original owner any defective product under warrantee provided the product is returned

postage prepaid to MFJ Enterprises, Inc. with a personal check, cashiers check, or money

order for $7.00 covering postage and handling.

3. This warranty is NOT void for owners who attempt to repair defective units. Technical

consultation is available by calling the Service Department at 662-323-0549 or the MFJ

Factory at 662-323-5869.

4. This warranty does not apply to kits sold by or manufactured by MFJ Enterprises, Inc.

5. Wired and tested PC board products are covered by this warranty provided only the wired

and tested PC board product is returned. Wired and tested PC boards installed in the

owner's cabinet or connected to switches, jacks, or cables, etc. sent to MFJ Enterprises,

Inc. will be returned at the owner's expense unrepaired.

6. Under no circumstances is MFJ Enterprises, Inc. liable for consequential damages to

person or property by the use of any MFJ products.

7. Out-of-Warranty Service: MFJ Enterprises, Inc. will repair any out-of-warranty product

provided the unit is shipped prepaid. All repaired units will be shipped COD to the owner.

Repair charges will be added to the COD fee unless other arrangements are made.

8. This warranty is given in lieu of any other warranty expressed or implied.

9. MFJ Enterprises, Inc. reserves the right to make changes or improvements in design or

manufacture without incurring any obligation to install such changes upon any of the

products previously manufactured.

10. All MFJ products to be serviced in-warranty or out-of-warranty should be addressed to:

MFJ Enterprises, Inc.,

300 Industrial Park Road

Starkville, Mississippi 39759 USA

and must be accompanied by a letter describing the problem in detail along with a copy of

your dated proof-of-purchase.

11. This warranty gives you specific rights, and you may also have other rights which vary

from state to state.

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