Hy-Gain Super Thunderbird TH-7DX Instruction Manual
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Hy-Gain Super Thunderbird TH-7DX Instruction Manual

Hy-Gain Super Thunderbird TH-7DX Instruction Manual

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  • Page 3: Table Of Contents

    TABLE OF CONTENTS (Cont.) CHAPTER 4..............……............4-1 Installation................…............4-1 Page Installation on a Crank-Up Tower....….…….…………............4-1 Attaching the Antenna to the Mast ....……………………..........4-1 Other Types of Towers .........………..............4-3 Lightning Protection..........……….............4-3 Attachment of Feedline ..........……..............4-3 VSWR Curves.............……..............4-3 VSWR/Front-to-Back Charts.......………………………........4-4 CHAPTER 5..............................5-1 Overation ......................5-1 CHAPTER 6..............………............6-1 Troubleshooting ..............……….……..........6-1 TroubleshootingChart..........………..............6-1 CHAPTER 7..............…....……….........7-1...
  • Page 4 CHAPTER 4 General The Hy-Gain TH7DX is a 7 element, 3 band beam Hy-Gain's 50 ohm BN-86 balun and preformed antenna designed for broadband, high performance feed straps are supplied. The TH7DX also comes operation on the Amateur 10, 15, and 20 meter with a wire boom support for additional strength.
  • Page 5 CHAPTER Preparation for FOR OUR OVERSEAS CUSTOMERS: The All tubing supplied with the TH7DX telescopes United States uses American units of measure- together. Make all measurements to the given ment. Please see page 7-2 of this manual for dimensions, plus or minus, no more than 1/8 assistance in identifying the hardware and com- inch.
  • Page 6 CHAPTER Assemble the two cast aluminum brackets (Item Assembly of the Boom-to-Mast No. 82) on the mast at the desired height above Brackets and Boom your tower. Secure the two brackets together using Select the boom-to-bracket clamp parts (Item Nos. the two (2) 5/16"-18 x 3 "...
  • Page 7 Assembly of the Elements-to-Boom Brackets on the Boom 10-Meter Reflector: Front Driven Select a pair of the smallest element-to- Select one pair of the largest element-to- boom brackets (Item No. 83). These are boom brackets (Item No. 85). These are marked with a number 4.
  • Page 8 15-Meter 10-20 Director and 15-20 Select another pair of the smallest element- Select two sets of medium sized element- to-boom brackets (Item No. 83). Assemble toboom brackets (Item No. 84) and loosely these 371/2 inches to the left of the 10- assemble these on the boom ends.
  • Page 9 After adjustment of the tubing lengths, tighten Installation of Tubing Clamps the clamp with a 5/16 inch nut driver, socket, Select the proper size tubing clamp as shown or open end wrench until the tubing will not in the chart. When installing the clamps, place twist or telescope.
  • Page 10 Use 10-meter trap, Part Number 878749, and Element Assembly 15 meter trap, Part Number 878637, in this To take advantage of the broadband nature of assembly. Make sure all insulators and trap the TH7DX, use the supplied dimensions as caps are firmly seated. shown in Figure 6.
  • Page 11 Select the R-1 section (11/4" x 83") and slip Select the D 1 section (7/8"x53") and slip the the unslotted end completely into the bracket unswaged end of the D1 completely into the (Item No. 84) assembled on the boom 48 bracket (Item No.
  • Page 12 Part Item Part Designator Description Designator Description Number Number 871098 11/4" x 83" FDE-3 190606 1"x6" 190303 11/8" x 52" FDE-4 178558 7/16" x 28" R3 & RDE-4 171153 7/16" x 37" 174861 7/8" x 53" R2-1 & D2-1 190206 7/8"...
  • Page 13 Place a 7/16" caplug on each end of the 15-Meter Director Element trapped elements, also. Select the 2" caplugs Select the D2-1 section (7/8" x 55") and slip and place one on each boom end. Check all the unswaged end of the D2-1 completely into element spacings and dimensions and tighten the bracket (Item No.
  • Page 14 AO-391S-B- FRONT Figure 8 Overall View of Beta Match and Phasing Tubes Select the remaining two (2) phasing tubes, two Phasing Line Assembly (2) beta support clamps, two (2) beta support Select the four (4) 3/4" x 23" phasing tubes insulators, two (2) beta top insulators, and as- (Item No.
  • Page 15 Select two (2) 1 1/4" aluminum tubing clamps, two (2) 7" pigtail assemblies and associated hardware as shown in Figure 10. Install as shown and tighten all bolts securely. AO-391S -C-003 Item Item Description Description Bolt, hex head, 5/16" - 18 x 5" Crossover Strap, TH7DX Bolt, hex head, 1/4"...
  • Page 16 Beta Match Assembly Feedpoint Assembly Select the two (2) beta match tubes (3/4" x Select the beta feed jumper straps, feed straps 70"), two (2) beta support clamps, two (2) beta and associated hardware as shown in Figure support insulators, two (2) beta top insulators, 11.

  • Page 17: Pigtail To Balun Connection And Front Driven Element

    Item Item Item Description Description Description Bolt, 1/4" - 20 x 3/8", hex Nut, #10-14, hex Strap, Beta Shorting, 3/8" Bolt, 1/4" - 20 x 11/2", Lockwasher, internal, #10 Clamp, Beta Support Bolt, 1/4" - 20 x 3/4", hex Bolt, #10-24 x 11/2", hex Pigtail Wire, Jr., 61/2"...
  • Page 18 Select the JR (6 1/2") pigtail assembly wires, 1 Measure the length of the assembled support cable 1/4" tubing clamps and associated hardware as and turnbuckle for each side. The lengths should shown in Figure 11. Expand the 1 1/4" clamps be within + \ -1/2".

  • Page 19: Boom Support Assembly

    Item No. Description 23 Bolt, hex Item head, 3/8" -16 x 2" 24 Nut, hex, No. Description 74 Chain Link, open end, 3/8" -16 3/16" 75Thimble, Wire Rope, 5/32", ss Lockwasher, internal, 3/8" Mast Clamp, Boom Support, 15/8" I.D. Bolt, hex head, 1/4" - 20 x Strap, Boom Support, ss 3/4"...

  • Page 20: Installation

    CHAPTER 4 Installation Attach the lifting rope to the balance point of Make sure all element tubing clamps and the antenna. Be careful not to damage the anchor bolts are securely tightened. Also, phasing line assembly next to the boom-to-mast make sure all beta match and phasing tube clamp.

  • Page 22: Other Types Of Towers

    Other Types of Towers Attachment of Feedline When installing the TH7DX on a guyed good quality coaxial transmission line such as Time RG-213/u tower, you may wish to use a different guide (solid), Belden 8237, 8367 or 9251 (solid). Take system.
  • Page 24 CHAPTER 24 The front-to-back ratio may be checked by Operation using a steady carrier transmitted by a local Connect the other end of your transmission station (at least a 1/2 mile away). The front-to- line to a good quality SWR meter and then to back ratio may be affected by the proximity of your radio.
  • Page 25 Watts:! PEP, completely waterproof: You can obtain this balun from your nearest Hy-Gain dealer. Cycolac® is a registered trademark of Borg-Warner Chemical, Inc. Penetrox® is a registered trademark of the Burndy Corporation. Skotchkote® is a registered trademark of 3M...

  • Page 26: Service Information

    All requests, inquires, warranty claims, or for need to order replacement parts, you should contact ordering replacement parts, contact: the Hy- Gain Customer Service Department. Hy-Gain You should fully research your problem by going 308 Industrial Park Road through the Troubleshoting Guides in Chapter 6...

  • Page 27: Parts Identification Information

    Parts Identification Information The size of the hardware is determined by the 'Item Numbers 1 thru 17 indicate the outside diameter (OD.) of the threads, e.g. aluminum: tubes and tubing assemblies used as 3/8", 5/16", 1/4", and #10. In the description elements on the TH7DX.

  • Page 28: Parts List

    PARTS LIST NOTE: Item numbers may not necessarily be in numerical sequence and may appear more than one time, depending on how often a part is used, or identical parts being placed in different parts packs. Item Description Qty Part No. Tubing Assembly, aluminum, R 1,1 1/4"...
  • Page 29 Parts List (Continued) Item Part No. Description_ . _ Qty 872200-1 Parts Pack TH7DX,1/4" Hardware, Stainless Steel (Continued) ..:. 554099 Nut, hex, 1/4" - -20:::....::........:::....75 562961 Lockwasher, internal, 1/4" ............105 872201-1 Parts Pack TH7DX, #10 Hardware, Stainless Steel ....1 500157 Bolt, hex head, #10 - 24 x 2............
  • Page 30 Parts List (Continued) Item Part No. Description 872098 Tube, Boom, 2" x 79 1/2" 873424 Balun, BN-86, 50 691081 Cable, Boom Support, 1/8" x 20' ..102734 Mast Bracket, cast 163764 Bracket, Element-to-Boom, #4............6 165919 Bracket, Element-to-Boom, #13............4 165920 Bracket, Element-to-Boom, #14............4 170447 Phasing Tubes, 3/4"...
  • Page 31 hy-gains LIMITED WARRANTY by gain by gain Warrants to the original owner of this product, if manufactured by hygain and purchased from an authorized dealer or directly from to be free from defects in material and workmanship for a period of 12 months for rotator products and 24 months for antenna products from date of purchase provided the following terms of this warranty are satisfied.

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