Hy-Gain DIS-72 Manual de usuario

DIS-72 Discoverer

7-2 40-Meter 2-Element

HF Beam

Instruction Manual

Hy-gain

308 Industrial Park Road

Starkville, MS 39759

Please record the following information for your records: Date

of Purchase:

Purchased From Price Paid

Please retain your copy of the Bill-of-Sale for Warranty

claims.

TABLE OF

CHAPTER 1- GENERAL DESCRIPTION......................................................................................

1-1 General Description

.............................................................................................................................. 1-1

CHAPTER 2 - PRE-ASSEMBLY

INFORMATION........................................................................ 2-1 Pre

aration for Assembl

CHAPTER 3 - ASSEMBLY

.................................................................................................................. 3-1 Assembly of the

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

Boom Brackets.................................................................................................................. 3-2

Assembly of the Driven

Element......................................................................................................... 3-2 Tubing

Clamps........................................................................................................................................ 3-4

Assembly of the Reflector Element

.................................................................................................... 3-5 Driven Element and Reflector

Linear-Loading Wire Assembly.....................................................3-8 Beta Match Assembly

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

CHAPTER 4 - INSTALLATION

..........................................................................................................4-1

Installation.........................................................................................................................................

.......4-1 Installation on a Crank-Up

Tower 4-1 Attaching the

CHAPTER 5 - SERVICE/PARTS

LIST.............................................................................................. 5-1 Service Information

................................................................................................................................5-1 Parts

List 5

LIST OF

Figure Pag

1 Assembly of Boom Tubes to Casting-to-Boom Bracket

and Boom-to-Bracket

Clamp........................................................................................ 3-1 2 Element-to-

Boom Brackets ............................................................................................. 3-2 3

Assembly of the Driven Element

.................................................................................... 3-3

4 Tubing Clamps

................................................................................................................... 3-4

5VSWR

Charts..................................................................................................................... 3-4

6 Front-to-Back Charts

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

CHAPTER I - GENERAL INFORMATION

General Description

The Hy-Gain Discoverer 7-2 is an optimum spaced,

two element beam for the 40 Meter Amateur band.

The Discoverer 7-2 incorporates the principles of

linear-loading which results in lower loss and

greater radiation efficiency than is possible with

loadin

coils.

The Discoverer 7-2 features stainless steel

hardware and clamps on all electrical and most

mechanical connections.

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.

SPECIFICATIONS

Mechanical

Total Number of

Elements........................................................................................................................2

Maximum Element Length ...................................................................................44.8 ft. (13.7 m)

Boom Length..........................................................................................................22.6 ft. (6.9 m)

Boom Diameter.........................................................................................................2 in. (51 mm)

Turning Radius ........................................................................................................25.0 ft (7.6 m)

Accepts Mast ............................................................................. ..........1.625 - 2.5 in. (41-64 mm)

Maximum Wind Survival ...... ......................................................................80 mph (128.7 kmph)

Wind Surface Area.......................................................................................6.0 sq. ft. (0.56 sq. m)

Effective Moment*............................. ......................................................1412 ft.-lb. (192 kg-m)

Wind Load at 80 mph ..........................................................................................................154

Hardware.............................................................................................stainless steel hardware

and clam

Suitable Rotors.....................................................................................................Hy

Gain Ham

Electrical

Maximum Gain.......... ............................................................................f)J dBi (4.3 dBd)

Front-to-BackRatio(maximum)…………...............................................................................15 dB

Number of Settings................................................................................................................... 3

Band Width

10 dB Front-to-Back..............................................................................................70 - 90 KHz 3:1

VSWR...............................................................................................................275 KHz @ 60 ft.

2:1 VSWR..........................................................................................................187 KHz @ 60 ft.

VSWR at Resonance ..............................................................................................less than 1.2

Nominal Impedance...................................................................................................50 ohms

Lightning Protection.......................................................................................... DC ground -3 dB

Beam Width ........................................................................77 de

rees @ maximum Front-to-

*Effective Moment is defined as the product of the weight of the antenna and the turning radius.

This figure should be used when selecting, an appropriate rotator.

1/1

2Blank

CHAPTER 2

PRE

ASSEMBLY

Pre

aration for Assembl

Corrosion Precautions

FOR OUR OVERSEAS CUSTOMERS:

The United States uses American units of

measurement. If you use the Metric System, see

"Convertin

American Measurements to Metric"

Choose a large clear area to assemble your

antenna. The area must be at least 23' x 45' (7m x

14m). If you assemble this antenna over a grassy

area, precaution should be taken so that

hardware is not accidentally lost during

assembly. A concrete driveway is an excellent

area for assembly.

TOOLS: The following tools are required for

'eas

assembl

of the Discoverer 7-2.

The Discoverer 7-2 antenna is designed to be

relatively maintenance free for most

environments. All hardware is made of passivated

stainless steel, typically grade 304. The internal

tooth-type lockwashers used in this antenna are

grade 410 stainless steel, and are slightly

magnetic. The element tubing clamps are grade

304 stainless steel. Most other metallic parts are

aluminum. All insulators exposed to sunlight are

made from U.V resistant black polyethylene or

black Cycolac®.

We have supplied a 3 oz. tube of Penetrox®A-3

from Burndy Corporation for use as an anti-

oxidant within element tubing assemblies. This

prevents aluminum oxide from forming on the

aluminum surfaces, especially in coastal

environments.

TYPE OF TOOL

Tape Measure, 12 foot ......

ustable Wrench

8 inch

Nut Driver, 7/16 inch .......

Nut Driver, 3/8

Nut Driver, 5/16 in

Standard Hand

Cut the cap off the tube of Penetrox®A-3. Have

some rags available to clean off excess from

tubing and hands. Be careful not to get this on

your clothin

Before assembling the tubing sections, abrade

the mating surfaces with a wire brush or

sandpaper. Apply the anti-oxidant to both

surfaces, then assemble joint. Wipe off any excess

material.

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 to

make sure no parts are missing.

A light amount of clear lacquer or an acrylic spray

may be used to coat the exterior surface of the

element assemblies if this antenna is to be

installed near a sea coast. Tighten all joints

securely before coating !

All tubing supplied with the Discoverer 7-2 tele-

scopes together. Make all measurement to the

given dimensions, plus or minus (+/-), no more

than 1/8 inch! The assembly of this antenna will

be easier if you read this manual completely

through at least twice before beginning

assembly. Allow at least 6 hours for assembly.

Double and triple check ALL dimensions after

assembly. Penetrox@ is a registered trademark of Burndy Corporation

Cycolac@ is a registered trademark of Borg-Warner

1/2

2Blank

HAPTER

Assembly of the Boom-To-Mast Brackets

and Boom

Refer to Fi

ure 1 and be

in as

Attach the remaining boom sections (Item No.

50 ) and secure with the two (2) 1/4" - 20 x

21/2" bolts, internal lockwashers and nuts (Item

Nos. 53, 32 & 34). Tighten all hardware

securely.

Select the boom-to-bracket clamp and castingto-boom

bracket (Item Nos. 2 and 3) and loosely assemble them on

the boom sections (Item No. 51) with the two 5/16"-18 x

2 3/4" bolts, split lockwashers and nuts (Item Nos. 25, 27

and 26 and the four (4) 1/4" - 20 x 3/4" bolts, internal

lockwashers and nuts (Item Nos 30, 32 and 34).

Item

No. Description No. Description

2Bracket

Castin

-to-Boom 32 Lockwasher

internal

1/4" - 20

3Clam

Boom-to-Bracket 34 Nut

hex

1/4" - 20

25. Bolt, hex head, 5/16"-18 x 2 3/4" 50 Tube, Boom, 2" x 83" 83"

26 Nut

hex

5/16" -18 51 Tube

Boom

2" x 54 3/4"

27 Lockwasher, split, 5/16" 53 Bolt, hex head, 1/4" - 20 x 21/2"

30 Bolt

hex head

1/4!' - 20 x 3/4"

Figure 1 Assembly of Boom Tubes to Casting-to-

Boom Bracket and Boom-to-Bracket Clamp

Element

Boom

Assembl

of the Driven Element

To save time, loosely assemble both of the ele-

ment-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 each assembled bracket over each boom

end. Position the center of each bracket 3

inches from the boom ends. DO NOT tighten

at this time.

Select the parts, as listed in Figure 3, and as-

semble them as shown. Before tightening the

hardware

make sure that:

DE1(Item No. 10) is inserted completely

into the driven element insulator.

DE1 (Item No. 10) is positioned with the

small holes u

and down.

DE1(Item No. 10) is positioned at 90

degrees from the boom-to-mast bracket, so

that the element will be horizontal when

installed on the mast.

NOTE: ASSEMBLY HARDWARE FOR THE

DRIVEN ELEMENT BRACKET IS THE SAME AS

USED ON THE REFLECTOR BRACKET.

372S

007

DRIVEN ELEMENT DETAIL

REFLECTOR DETAIL

Item

No.

4 17

Description

Bracket, Element-to-Boom, #14 "

Insulator, Element, DE1

Bolt, hex head, 1/4"--20 x

3/8" Bolt, hex head, 1/4"--20

x 3/4" Lockwasher, internal,

1/4"-20 Nut, square, 1/4"--

Nut, hex, 1/4"--20

Figure 2 Element-to-

Boom Brackets

3-2

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.

372S

Item

No. Description

7 Tube, Element, DE4 and R4, 5/8" x 26"

8 Tube, Element, DE3 and R3, 7/8" x 55"

9 Tube, Element, DE2 and R2,1" and 51"

10 Tube, Element, DE1 and R1, 11/4" x 83"

16 Insulator, Element, 40 Meter

17 Insulator, Element, DEl

29 Bolt, hex head, 1/4!'- 20 x 11/2"

32 Lockwasher, internal, 1/4" - 20

34 Nut, hex, 1/4" - 20

35 Bolt, hex head, #10 - 24 x 2"

38 Nut, hex, #10 - 24

40 Lockwasher, internal, #10

43 Tubing Clamp

45 Caplug, black, 2"

46 Caplug, black, 7/16"

49 Tube, Element, DE5, 7/16" x 58"

50 Tube, Boom, 2" x 83"

"A" Dimension One Half DE I-ngth*

Setting (Inches) (mm) (Inches) (m)

Cw 47 1194 258 6.553

MID 44 1118 255 6.478

PHONE 41 1041 252 6.401

*Measured from boom edge to element tip.

Figure 3 Assembly of the

Driven Element

Installation of Tubin

Select the #6 tubing clamp as shown in the

chart. When installing the clamp, place the

clamp near the tube end with the top of the

clamp over the slot in the tube as shown in

Figure 4.

After adjustment of the tubing lengths, tighten

the clamp with a 5/16 inch nut driver, socket,

or open end wrench until the tubing will not

twist or telescope.

Refer to Figure 4 for tubing clamp assembly in-

formation. Tighten these clamps securely after

setting Item Nos. 7 and 49 to their proper

length.

The Discoverer 7-2 is supplied with dimensions

for three (3) settings within the 40 Meter

Amateur band. The three (3) settings are en-

titled CW, MID, and PHONE. The CW setting

is optimized for operation from 7.00-7.15 MHz.

The MID setting is optimized for operation

from 7.05-7.25 MHz and the PHONE setting is

optimized for operation from 7.15-7.30 MHz.

The VSWR, Front-to-Back Ratio, and Gain

curves are shown in Figures 5, 6, and 7. From

this information, choose one of the three

settings to use.

Set the length of the DE5 section A to one of the

len

ths shown in Table 1.

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