Hy-Gain DIR-73 User manual

DIR-

Discoverer 73 Director

40-Meter Kit for DIS-72

Instruction Manual

308 Industrial Park Road

Starkville, MS 39759 USA

PH: 662-323-9538

FAX: 662-323-6551

TABLE OF CONTENTS

Page

General Description ...............................….............................................................................1-1

Specifications …......................................................................................................................1

CHAPTER 2 - PRE-ASSEMBLY

OAO 21

Preparation for Assembly .....................................................................................................2-1

Discoverer 7-2 Disassembl

Information .............................................................................2-1

CHAPTER 3 - ASSEMBLY

Assembly of the Boom-to-Mast Brackets and Boom.........................................................`..3-1

Element-to-Boom Brackets.....................................................................................................3-1

Assembly of the Driven Element...........................................................................................3-3

Installation of Tubing Clamps ................................................................................................3-5

Assembly of the Reflector Element .......................................................................................3-7

Assembly of the Director Element.........................................................................................3-8

Driven Element, Reflector and Director Linear-Loading Wire Assembly.......................... 3-11

Beta Match Assembly.......................................................................................................... 3-14

Lightning Protection............................................................................................................ 3-15

Attachment of Feedline ...................................................................................................... 3-15

Boom Support Assembly...........…....................................................................................... 3-15

CHAPTER 4 - INSTALLATION

Installation............................................................................................................................ 4-17

Installation on a Crank-Up Tower........................................................................................ 4-17

Attaching the Antenna to the Mast ...................................................................................... 4-17

Other Types of Towers ........................................................................................................ 4-18

Operation ............................................................................................................................. 4-19

Maintenance....................................................................................................................... 4-19

VSWR Calculations .......................................……………………………………………...4-19

CHAPTER 5 - SERVICE

Service Information ............................................................................................................. 5-21

Attachment .......................................................................................................................... 5-22

Parts List.............................................................................................................................. 5-23

Convertin

lish Measurements to Metric..............…………………………………......5-25

LIST OF ILLUSTRATIONS

ure Pa

1 Assembl

of Boom Tubes to Castin

-to-Boom Bracket

and Boom-to-Bracket Clam

........................................................................... 3-2

2 Element-to-Boom Brackets .................................................................................. 3-3

3 Assembl

of the Driven Element.......................................................................... 3-4

4 Tubin

Clam

s...................................................................................................... 3-5

5 VSWR Charts ....................................................................................................... 3-6

6 Front-to-Back Ratios ............................................................................................ 3-6

7 Assembl

of the Reflector Element ..................................................................... 3-7

8 Assembl

of the Director Element........................................................................ 3-9

9 Overall View of Antenna .................................................................................... 3-10

10 Linear-Loadin

Wire Assembl

.......................................................................... 3-11

11 Attachment of Linear-Loadin

Wire Assembl

Near Insulator....................... 3-12

12 Identification of Linear-Loadin

Wires

(

LLW

)

................................................. 3-13

13 Beta Match Assembl

......................................................................................... 3-14

14 Boom Su

ort Assembl

.................................................................................... 3-16

15 Attachin

Boom-to-Mast Bracket............................................................................ 4-18

CHAPTER 1 GENERAL

INFORMATION

General Descri

tion

The Hy-Gain Discoverer 7-3 Director Kit

contains all of the necessary parts and instructions

to convert the Hy-Gain Discover 7-2, 2 element,

40 meter beam into a Discoverer 7-3, 3 element,

40 meter beam.

The Discoverer 7-3 features stainless steel

hardware and clamps on all electrical and most

mechanical connections. It also features a dual

wire boom-support system which gives both

lateral and vertical su

ort and stabilit

The Discoverer 7-3 incorporates the principles of

linear-loading which results in lower loss and

greater radiation efficiency than is possible with

loading coils when used in shortened elements.

The Discoverer 7-3 also features a low voltage

feedpoint that eliminates insulator failures and

assures full power capabilities.

WARNING

When installing your system take extreme care

to avoid any accidental contact with power lines

or overhead obstructions. Failure to exercise this

care could result in serious or fatal injury.

*Gain and front-to-back figures verified by

computer modeling using the MININEC-3

and NEC computer codes along with actual

measurements on Hy-Gain's antenna range.

CHAPTER 2 PRE-ASSEMBLY

INFORMATION

Pre

aration for Assembl

FOR OUR OVERSEAS CUSTOMERS: The

United States uses American units of

measurement. If you use the Metric System,

see "Converting American Measurements to

Metric" in Chapter 5.

Choose a large clear area to assembly your

antenna. The area must be at least 36' x 46'

(11 m x 14 m). If you assemble this antenna

over a grassy area, precautions should be

taken so that hardware is not accidentally lost

during assembly. A concrete driveway is an

excellent area for assembl

after assembly. Check the tightness of ALL

hardware after assembl

If you have already assembled the Discoverer

72, and are now adding the Discoverer 7-3

Director Kit, allow at least 2 hours for

assembly. If you are assembling the

Discoverer 7-3 from scratch, allow at least 5

hours for assembly.

Discoverer 7-2 Disassembly

Information

If you are assembling the Discoverer 7-3

from scratch, skip this section and proceed to

Cha

ter 3, "Assembl

TOOLS: The following tools are required for

eas

assembl

of the Discoverer 7-3. If you are adding the Discoverer 7-3 Director

Kit to a previously assembled Discoverer 7-2,

then follow these instructions.

The Discoverer 7-2 must be at ground or

rooftop level to work on it. DO NOT try to

modif

it while on

our tower.

The following parts may be disassembled and

discarded, as they will be replaced by new

parts in the Director Kit. (See Figure 14,

Boom Support Assembly, in the Discoverer 7-

2 Manual.)

NOTE: When unpacking your antenna, check

inside of all tubing for parts (smaller tubing,

etc.). To conserve space, these smaller articles

are sometimes put inside larger pieces. Check

all parts against the Parts List and illustrations

to make sure no parts are missing.

All tubing supplied with the Discoverer 7-3

telescopes together. Make all measurements

to the given dimensions, plus or minus (t), no

more than 1/8 inchi The assembly of this

antenna will be easier if you read this manual

completely through at least twice before

beginning assembly. Double and triple check

ALL dimensions

The turnbuckles (Item No. 57) will be used in

a later assembl

do not discard them.

The chain links (Item No. 58) and mast

clamps (Item No. 60) and all hardware should

be saved for the Discoverer 7-3.

The casting-to-boom bracket and boom-to-

bracket clamp (Item Nos. 2 and 3 of Figure 1

in the Discoverer 7-2 manual) with their

hardware should be loosened and the two

5/16"-18 x 2 3/4" bolts (Item No. 25) removed

from this assembly. The center boom sections

(Item No. 51) can then be removed from the

casting-to-boom bracket and boom-to-bracket

clamp (Item Nos. 2 and 3).

The driven element-to-boom clamp should be

loosened so that the driven element can be

removed from the boom end. The element-to-

boom clamp and beta match assembly should

be disassembled and saved for later

reassembly. The length of the driven element

will be adjusted in a later step.

The reflector element-to-boom clamp should

be loosened so that the reflector element can

be moved to 12 inches from the boom end

(measured to the center of the element). Posi-

tion the reflector element and tighten all

hardware while ensuring the element will lie

in the same horizontal plan as before. The

reflector element length will be adjusted in a

later step.

CHAPTER 3

ASSEMBLY

Assembly of the Boom-to-Mast

Brackets and Boom

Refer to Figure 1 and begin as follows:

Select the casting-to-boom bracket and

boom-to-bracket clamp (Item Nos. 2 and 3)

and loosely assemble them on the three (3)

boom sections (Item Nos. 67 and 70) with

the hardware shown in Figure 1. To easily

accomplish this, slide the 13/4" O.D. boom

insert (Item No. 70) into one of the 2" x 81"

boom sections (Item No. 67) and line up the

holes. Assemble these two boom pieces

loosely to the clamp and bracket (Item Nos.

2 and 3) with a single 5/16"-18 x 2 3/4"

bolt, lockwasher and nut (Item Nos. 25, 27

& 26) to keep the hole alignment. Slide the

other 2" x 81" boom section (Item No. 67)

over the boom insert (Item No. 70) and into

the clamp and bracket assembly. Line up

the holes and install the remaining 5/16"-18

x 2 3/4" bolt, lockwasher and nut (Item

Nos. 25, 27 & 26). Tighten all hardware in

the clamp assembly at this time.

Element-to-Boom Brackets

To save time, loosely assemble ALL of the

element-to-boom brackets and their

appropriate hardware before beginning further

installation of the antenna. See Figure 2. The

different sized brackets can be identified by a

number stamped into the surface of each

bracket half. DO NOT tighten the bolts until

instructed to do so.

Slide the large driven element bracket over

the front boom end to the location shown in

Figure 3. You may wish to assemble this

bracket on the boom at this location. The

center of this bracket should be 115/8 inches

in front of the edge of the boom-to-mast

bracket assembly. The remaining two brackets

should be slid over each boom end and

positioned. The reflector bracket will be 12

inches from the rear boom end and the

director bracket will be 14 inches from the

front boom end. Do not tighten at this time.

Attach the four remaining 2" O.D. boom

sections (Item Nos. 50 and 51) from the

Discoverer 7-2, and secure with the

hardware shown in Figure 1. Tighten all

hardware securel

If the reflector had been preassembled, en-

sure that the reflector element will be paral-

lel to the ground when installed. If not, then

loosen the anchor screws on the element-to-

boom bracket and turn the element to its

proper position. Retighten the anchor

screws.

Figure 1 Assembly of Boom Tubes to Casting-to-

Boom Bracket and Boom-to-Bracket Clamp

NOTE: ASSEMBLY HARDWARE FOR THE

DRIVEN ELEMENT BRACKET IS THE

SAME AS USED ON THE REFLECTOR

BRACKET.

DRIVEN ELEMENT DETAIL DIRECTOR/REFLECTOR DETAIL

Figure 2 Element-to-

Boom Brackets

Assembl

of the Driven Element

Select the parts as listed in Figure 3 and as-

semble them as shown in Figure 3. Before

htenin

the hardware, make sure that:

NOTE: If you are adding the Discoverer 7-3

Director Kit to a preassembled Discoverer 7-

2, then you only need to readjust the DE5

section, "A"dimension, to that shown in Table

1 and position the driven element on the

boom.

DE1(Item No. 10) is inserted completely

into the driven element insulator.

DE 1 (Item No. 10) is positioned with the

small holes u

and down.

Tighten the anchor bolts on the element-to-

boom bracket (Item No. 28) last. This will en-

sure that the element will not slip on the

boom.

DE1(Item No. 10) is positioned at 90

degrees from the boom-to-mast bracket to

that the element will be horizontal when

installed on the mast.

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