Hy-Gain DIR-73, Discoverer 73 Director Instruction Manual
DIR-
73
Discoverer 73 Director
40-Meter Kit for DIS-72
K
Instruction Manual
308 Industrial Park Road
Starkville, MS 39759 U S A
PH: 662-323-9538
FAX: 662-323-6551
TABLE OF CONTENTS
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General Description ...............................….............................................................................1-1
CHAPTER 2 - PRE-ASSEMBLY
Preparation for Assembly .....................................................................................................2-1
Discoverer 7-2 Disassembl
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
Information ............................................................. ............ ....2-1
Page
-
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
English Measurements to Metric..............…………………………………......5-25
LIST OF ILLUSTRATIONS
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Figure Pa
1 Assembly of Boom Tubes to Casting-to-Boom Br ac k e t
and Boom-to-Bracket Clamp ........................................................................... 3-2
2 Element-to-Boom Brackets .................................................................................. 3-3
3 Assembl
4 Tubin
5 VSWR Charts ....................................................................................................... 3-6
6 Front-to-Back Ratios ............................................................................................ 3-6
7 Assembl
8 Assembl
9 Overall View of Antenna .................................................................................... 3-10
10 Linear-Loadin
11 Attachment of Linear-Loadin
12 Identification of Linear-Loadin
13 Beta Match Assembl
14 Boom Su
15 Attachin
of the Driven Element.......................................................................... 3-4
Clamps...................................................................................................... 3-5
of the Reflector Element ..................................................................... 3-7
of the Director Element........................................................................ 3-9
Wire Assembly.......................................................................... 3-11
Wire Assembly Near Insulator....................... 3-12
Wires (LLW) ................................................. 3-13
......................................................................................... 3-14
ort Assembly.................................................................................... 3-16
Boom-to-Mast Bracket............................................................................ 4-18
CHAPTER 1 GENERAL
INFORMATION
General Description
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 support and stability.
The Discoverer 7-3 incorporates the principles o f
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
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INFORMATION
Preparation 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
(11
m
x 14 m).
If you assemble this antenna
36' x 46'
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
.
TOOLS: The following tools are required for
eas
assembly of the Discoverer
7-3.
after assembly. Check the tightness of ALL
hardware after assembl
.
If you have already assembled the Discoverer
2, and are now adding the Discoverer
7
Director Kit, allow
least 2 hours for
at
7-3
assembly. If you are assembling the
Discoverer
from scratch, allow at least 5
7-3
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
If you are adding the Discoverer
Kit to a previously assembled Discoverer
The Discoverer
"Assembly".
3,
7-3
must be at ground or
7-2
Director
7-2,
rooftop level to work on it. DO NOT try to
modif
it while on your tower.
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 i llustrations
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 following parts may be disassembled a nd
discarded, as they will be replaced by new
parts in the Director Kit. (See Figure 14,
Boom Support Assembly, in the Discoverer
Manual.)
2
The turnbuckles (Item No.
a later assembl
do not discard them.
will be used in
57)
7-
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-tobracket 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 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). Position 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.
The driven element-to-boom clamp should be
loosened so that the driven element can be
removed from the boom end. The element-toboom clamp and beta match assembl y should
be disassembled and saved for later
reassembly. The length of the driven element
will be adjusted in a later step.
CHAPTER 3
y
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 8 1"
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 bracket s
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, ensure that the reflector element will be parallel to the ground when installed. If not, then
loosen the anchor screws on the ele ment-toboom bracket and turn the element to its
proper position. Retighten the anchor
screws.
.
Figure 1 Assembly of Boom Tu bes to Cast ing-to-
Boom Bracket and Boom-to-Bracket Clamp
NOTE: ASSEMBLY HARDWARE FOR THE
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DRIVEN ELEMENT BRACKET IS THE
SAME AS USED ON THE REFLECTOR
BRACKET.
DRIVEN ELEMENT DETAIL
Figure 2 Element-to-
Boom Brackets
Assembl
of the Driven Element
Select the parts as listed in Figure 3 and assemble them as shown in Figure 3. Before
ti
htening the hardware, make sure that:
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.
DIRECTOR/REFLECTOR DETAIL
NOTE: If you are adding the Discoverer 7-3
Director Kit to a preassembled Discoverer 72, 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.
Tighten the anchor bolts on the element-toboom bracket (Item No. 28) last. This will ensure 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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