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
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
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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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