Directive Systems & Engineering DSE3-50 Manuale utente

DSE3-50 Rev 6/20

Directive Systems & Engineering

2702 Rodgers Terrace

Haymarket, VA 20169-1628

www.directivesystems.com

703-754-3876

3-ELEMENT 50-MHZ YAGI, DSE3-50

INTRODUCTION

The Directive Systems DSE3-50 is a 3 element Yagi-Uda antenna that provides optimum

performance for a 6-foot boom-length antenna, while addressing construction details of importance to

the first-time, as well as the experienced, builder. Design issues such as selecting the grade of

aluminum used for boom and element material to assure harsh-environment survivability, use of

stainless-steel boom hardware and element-assembly hardware, and use of commonly available

hand tools to aid in ease of construction, have been considered in producing an antenna kit which is

complete, satisfying to build, and gives the builder one of the finest 6-meter antennas available.

ELECTRICAL SPECIFICATIONS

Calculated gain: 8 dBi

SWR 1.5:1 Bandwidth: 2 MHz

SWR 50.1 MHz Less than1.3:1 typical

F/B ratio: >20 dB

Impedance: 50 ohms nominal

Maximum Power: 1000 Watts

MECHANICAL SPECIFICATIONS

Length: 6 feet

Turning radius: ~96 inches

Boom-sections/elements 6063-T832 aluminum

1.375" x .058" wall

Element sections: 5/8" & ½" x .058" wall

T-match arms: 3/8" x .058" wall

All stainless steel hardware.

Surface area: ~1.5 square feet

Wind survival: 90+ mph

Maximum mast size: 2.0" OD –larger on Special orders

Coax connector: Weatherproof N–type

Assembled weight: 7.5 lbs

CAUTION: While we strive to remove all burrs from all machined parts, there is always the possibility of

sharp edges. We strongly suggest checking the edges and use a fine file, or 400 grit

sandpaper, to remove any burrs that may have been left.

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DSE3-50 Rev 6/20

BEFORE INSTALLING YOUR NEW ANTENNA, PLEASE BE SURE

TO READ THE ENCLOSED WARNING PAMPHLET.

ASSEMBLY TIPS AND NOTES

TOOLS

Assembly of your antenna kit requires the following tools.

12’ or greater tape measure

#2 Phillips screwdrivers

7/16” wrench or rachet and socket

Permanent marker (Sharpie)

Pliers

ASSEMBLY TIPS

1. Read an entire section before performing each assembly operation.

2. This Manual contains assembly drawings and other assembly-related information such as

element lengths. Drawings are referred to by Figure number; charts and lists are referred to

by Table number. Continue using the same Table or Figure number until told to use a different

one.

3. All of the information needed to successfully complete the construction of an antenna kit is

contained in this Manual. Keep this Manual in a safe place so that it will be available should

you require it for future reference.

4. When tightening hardware FOLLOW INSTRUCTIONS –DO NOT OVER TIGHTEN!

Deformation of the boom may occur, causing misalignment of elements.

5. Orient all hardware as instructed in each assembly step and as may be shown in an

associated figure.

Elements will be called out by their position on the boom, R = reflector, DE = driven element and D-

element number = director. The director’s number is relative to the DE element with D-1 nearest the

DE. The elements are marked R, DE and D.

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DSE3-50 Rev 6/20

PARTS LIST

Note: All hardware is Stainless Steel unless otherwise noted.

Unpack the antenna kit and check each part against the following list. Do not throw any packing

material away until the antenna is completely assembled and ready for final installation. Some parts

may be packed inside boom sections.

The box in which the antenna was shipped contains the following items:

1 6’ boom section

1 Boom to mast plate

6 Element halves (R, DE, D)

3 Element couplers

2 48” T-arms

1 Connector bracket assembly

1 Balun

1 Anti Seize Compound

Hardware Bag

Boom-to-Mast Hardware

2 T-arm shorting bars

4 8-32 x 1¼” Machine screws

5 #8 Nuts

4 #8 Split lock washers

2 #8 Internal tooth lock washers

2 6-32 x ½” Machine screws

5 #6 Internal tooth lock washers

3 1 ½” U-bolts

6 ¼” Locknuts

2 ¼” x 1 ¾” U-bolts

4 ¼” Nuts

4 ¼” Lock washers

4 ¼” Flat washers

2 5/16” U-bolts

4 5/16” Nuts

4 5/16” Lock washers

4 5/16” Flat washers

3 Element saddles

6 ½” Element End caps

2 3/8” T-arm End caps

2 1 3/8” End caps

3 Cable ties

Anti-Seize Compound - Apply a small amount to the aluminum joints to prevent the aluminum from

oxidizing and to the threads of the U-Bolts to prevent galling.

ANTENNA ASSEMBLY

1. Locate the 6’ boom section and, using a permanent marker (refer to Figure 1), place a mark 2 ¼”

from one end of the boom –this is the Reflector point. All further measurements are made from

this end of the boom. Next, place a mark at 42 ¼” – this is the Driven Element point. Next, place a

mark at 34 ¼” – this is the center line of the boom-to-mast plate. Last, place a mark at 69 ¾” – this

is the Director.

If this DSE3-50 has the rear mount option, place a mark 3 7/8” from the end of the main boom.

Slide the 12” piece of 1 ½” tubing to this line, with the slits over the boom.

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DSE3-50 Rev 6/20

Mount the reflector 11 ½” from the rear of the boom extension. Tighten this U-bolt securely as this

connection keeps the antenna horizontal. If your location is subject to icing, we recommend

installing a sheet metal screw to lock these two boom sections together.

2. Starting with the Reflector elements (R), slide the two halves into the element coupler until you

see the holes in the elements line up with the holes in the element coupler. Pass a U-bolt from the

hardware bag over the boom, through an element saddle and then through the holes in the

element. Align this assembly on the rear of the boom so that the U-bolt covers the mark you made

in step #1. Install two ¼” locknuts and tighten.

2 ¼”

34 ¼”

42 ¼”

69 ¾”

105" DE

112¾” R

117"

DSE3-50 Dimensions

All distances measured

from rear of boom

Drawing not to scale –all

dimensions +/- ¼”

Boom to mast bracket

Figure 1

3. Similarly, assemble the Director (D) and attach it at the appropriate mark on the boom, making

sure the element is perpendicular to the Reflector.

4. The Driven Element (DE) mounts the same way; however, the connector bracket sits between the

element and the element to boom saddle (see Figure 2).

5. Locate the two 48” x 3/8” T-arms and the balun, and from bag #3 locate the T-arm shorting bars,

the #8 hardware and the #6 hardware. The connector bracket came with the Delrin standoffs

already installed. Using a 6-32 X ½” screw, place an internal tooth lock washer on the screw and

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DSE3-50 Rev 6/20

put the screw through one of the balun lugs connected to the center conductor. Next, place a

second internal tooth lock washer on the screw, then insert the screw through the lug from the

coax connector. Last, place a third internal tooth lock washer on the screw, then insert through

one of the tee arms and screw it in to the Delrin standoff insulator. Do not over tighten the screw

as you can strip the threads in the standoff insulator.

6. Slide the T-arm shorting bar over the end of the driven element and the T-arm. The shorting bar

should be about 13” from the outer end of the driven element. Install 8-32 X 1 1/4” screws through

the two holes in the shorting bars and install a lock washer and nut. Tighten both the shorting bar

screws. Attach the other T-arm in a similar fashion, but without the wire coming from the

connector and locate the shorting bar about 13” from the end of the other driven element half.

Boom

1/4" X 1 1/2" X 3" U-BOLT

Delrin standoff insulators

connection point for

Balun and T-match arms

Front

Driven element

Element Saddle bracket

N-Connector

¼” Locknut

Figure 2

7. Connect both ground wires from both ends of the balun to the grounding screw just below the

connector. Place a lock washer on the stud first, then both lugs, another lock washer and then the

nut and tighten. Refer to Figure 3 for details.

8. Dress the balun along the boom or coil it as pictured. Securely tape the balun to the boom or use

cable ties as pictured.

Figure 3

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DSE3-50 Rev 6/20

9. Install supplied plastic caps on ends of tubing.

10.Place the boom-to-mast plate against the boom at the marked center line (Step 1) and from the

Boom-to-Mast hardware bag, use two ¼” U-bolts, ¼” flat washers, lock washers and nuts. Tighten

the four ¼” nuts, making sure the boom-to-mast plate is perpendicular to the elements.

11.This completes the antenna assembly. Using the dimensions shown, the SWR below 50.4 MHz

will be 1.3:1 or less. If you wish to improve the match, support the antenna at least one

wavelength above the ground (about 20 feet). Check the match using a directional wattmeter or

antenna analyzer. You can move the shorting bars in or out to change the match on the antenna.

Always use coax in multiples of one half wavelength when testing to ensure you are seeing the

real match of the antenna. After completing your match adjustment, or if you don’t want to adjust,

tighten the four nuts on the shorting bars.

DO NOT, UNDER ANY CIRCUMSTANCES, APPLY ANY TYPE OF SEALANT OR COATING TO THE

DRIVEN ELEMENT, T-ARMS OR CONNECTOR ASSEMBLY, OTHER THAN KRYLON®

CLEAR COAT. ANY OTHER COATING WILL ADVERSELY AFFECT THE SWR AND VOID YOUR

WARRANTY.

Directive SystemsWarranty Policy

All Directive Systems antennas are built with the finest materials available. We take great pride in

building a quality product that will give years of good service and performance. If there is a defect in materials

or workmanship within 90 days of purchase, Directive Systems will repair or replace the defective part, free of

charge, to the original purchaser. DO NOT RETURN ANYTHING WITHOUT PRIOR AUTHORIZATION FROM

DIRECTIVE SYSTEMS. Please contact us either by phone or email describing the problem and we will resolve

your problem.

If, after examining a new antenna you received, you are not satisfied, contact us immediately for return

authorization and refund. ANY ANTENNA THAT HAS BEEN MODIFIED WILL BE SUBJECT TO A

RESTOCKING CHARGE. IF AN ANTENNA IS SO MODIFIED AS TO MAKE IT UNUSABLE, DIRECTIVE

SYSTEMS RESERVES THE RIGHT TO REFUSE TO ACCEPT THE ANTENNA FOR RETURN.

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