MFJ MFJ-1903 Manual de usuario

MFJ-1903 Tilt-Mount Instruction Sheet

Introduction: The MFJ-1903 Universal Vertical Tilt Base is designed to let you

assemble and adjust your vertical antenna on the ground, then walk it up into its

vertical operating position with safety and minimal effort. Made from rugged 1/8-

inch aluminum plate, the MFJ-1903 features a pattern of pre-punched mounting

holes that accept most common U-bolt sizes for antenna masts up to 2-1/4

inches in diameter. In addition, you can bolt many popular verticals using

insulated base brackets directly to the MFJ-1903 swing plate without using U-

bolts (Hy-Gain AV18VS, AV18AVQII, AV14AVQ, AV12 AVQ, DX-88, etc). The

MFJ-1903 also provides spare bolt holes for connecting a ground rod or a radial

system.

Installation Instructions: Before assembling your MFJ-1903, please check the

parts list on page-2 to confirm that all listed items are included.

[ ] Find the two 2-1/4” U-bolts and 3/8” hardware. Attach the base bracket (wider

of the two mounting plates) securely to your base support.

[ ] Find two 5/16” bolts and hardware. Attach the tilt bracket (narrower plate) to

the base bracket’s pivot point, as shown below. Do not over-tighten -- the tilt

bracket should remain moveable.

[ ] Using your antenna’s mounting hardware, install the support mast (or

insulated bracket) onto the face of the tilt bracket.

[ ] After the antenna has been raised vertically into position, lock the tilt bracket

to the base bracket using the remaining two 5/8” bolts and hardware. Check and

re-tighten all hardware to ensure everything is tight.

Antenna

U-bolt

U-bolt

Lock Bolt (x2)

5/16"

Pivot Bolt (x2)

5/16"

Tilt Bracket

Base Bracket

Base Pipe

Base Support: Your base support pipe (not included with the MFJ-1903 kit)

should be made from thick-wall steel or aluminum tubing and extend at least 3 to

4 feet below ground. For multi-band verticals, we recommend seating the pipe in

a 10-inch diameter posthole filled with ready-mix concrete to ensure stability.

Note that antenna base supports should always be located well clear of power

lines or neighboring property to avoid exposure to life-threatening injury or

liability.

Parts List: Please check the contents of your MFJ-1903 package for the

following items:

[ ] 1 Base bracket

[ ] 1 Tilt bracket

[ ] 2 2-1/4” x 3/8” U-bolts

[ ] 2 2-1/4” Mast Saddles

[ ] 4 3/8” nut

[ ] 4 3/8” flat washer

[ ] 4 3/8” split lock washer

[ ] 4 5/16” x ¾” bolt

[ ] 4 5/16” nuts

[ ] 4 5/16” flat washer

[ ] 4 5/16” split lock washer

Missing or Defective Parts: MFJ warrants that all listed items for your MFJ-

1903 tilt-mount kit are included and free from defect. If your bill of materials is

missing parts or contains damaged items, contact the factory by phone at (662)

323-9715 to arrange for replacement or write. Our mailing and shipping address

is: MFJ, 300 Industrial Park Road, Starkville, MS 39759. Please do not return any

items to MFJ unless explicitly authorized to do by MFJ Customer Service.

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