MFJ MFJ-1904, MFJ-1904HG18 User Manual

MFJ-1904 Assembly Manual

Portable Antenna Base

INTRODUCTION

The MFJ Ground-Coupled Portable Antenna Base gives you a stable way to mount your vertical antenna and provides an effective ground by just setting the base down and standing on it to push the legs firmly into the ground. It will support many multi-band verticals.

You can operate 160 Meters thru 2 Meters and above almost anywhere with an effective signal. It is perfect for traveling or for semi-permanent summer or winter homes. You can easily set up and take down your vertical antenna for stealth operation if you live in an antenna-restricted area.

The base can support a lightweight multi-band like the MFJ-1795, Hy-Gain 18AVS, or Hy-Gain 14 AVQ. A screwdriver antenna can also be used with the base. This will provide a semi-permanent installation. You can even hide the base by covering it with dirt.

The base is also equipped with a 3/8” stud for mounting the MFJ HF Mobile Ham-tenna™ whips. The whips can be mounted either on the antenna base or on the vertical bracket.

The MFJ-1910 Telescoping Fiberglass Mast is well supported by the Antenna Base. This provides a simple support for wire antennas.

A built-in antenna mount with two U-bolts lets you mount most standard and even many homemade vertical antennas. A SO-239 coax connector is attached to the mount for easy connection.

TOOLS AND SUPPLIES

Construction area: This kit requires a large, clean, well-lighted area where you can easily organize and handle all the included hardware. Safety is always important! Use a suitable high temperature stand for your soldering iron, and keep the work area free of clutter.

The following common bench items are recommended for assembly of this kit:

qSoldering Iron (grounded-tip and temperature-controlled preferred)

qHigh-temperature Iron Holder with Cleaning Sponge

qSolder, 60/40 or 37/63 with rosin or “no-clean” flux

q1 set Standard Size Wrenches or Crescent Wrench

qFlat-tip Screwdriver

qPhillips-tip Screwdriver

qRegular Pliers

q_" Wrench

PARTS LIST

Your kit should contain all of the parts listed below. Please identify and inventory each item on the checklist before you start building. If any parts are missing or damaged, refer to the manual's warranty section for replacement

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MFJ-1904 Assembly Manual

Portable Antenna Base

instructions. If you cannot positively identify an item, set it aside until all other items are checked off. You may then be able to identify it by process of elimination. Finally, your Portable Antenna Base will go together easier if parts are organized by type. Use this inventory as an opportunity to sort and arrange parts so you can identify and find them quickly.

˛	Qty	Part Description
	8	Bolt – 1/4-20 x 3/8"
	4	Bolt – 10-24 x 5/8"
	4	Screw – 8/32” x 1/2"
	4	Screw – 8/32” x 3/8"
	6	Bolt – 1/4-20 x _ "
	4	Wing Nut – 10-24”
	4	Nut – 10-24”
	14	Nut – 1/4-20”
	4	Nut – 6/32”
	14	Lock Washer – 1/4"
	8	Lock Washer – 3/16 "
	2	Coax Connector – SO-239
	1	3/8”-24 bolt
	1	Shoulder Washer
	1	Flat Fiberglass Washer
	1	Antenna Coupling Nut 3/8”-24”
	1	Solder Lug
	1	Ground Plate – 2' x 2'
	1	Tower
	4	Foot
	2	Bushing
	2	U-Bolt Assembly
	2	Handle
	1	Wire

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MFJ-1904 Assembly Manual

Portable Antenna Base

GROUND PLATE DIAGRAM

The following diagram shows the hole locations on the ground plate.

Note: This is a flat drawing of the ground plate before bending.

E E C C

A	A
B	D
A	A

C C

E E

TOWER DIAGRAM

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