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1、TH2-MK3 2-Element HF Beam 10, 15, 20- Meter CHAPTER 1 GENERAL INFORMATION General This antenna model is a two-element tri- bander designed to cover 10, 15 and 20 meters. Automatic band switching is accomplished through the use of Hy-Gains Hy-Q traps. The exclusive Beta Match system insures optimum t
2、ransfer of electrical energy. The TH2MK3-S now features stainless steel hardware and clamps for all electrical and most mechanical connections. The antenna features taper swaged, seamless aluminum tubing for maximum mechanical reliability. The stainless steel tube clamps in- sure the best possible m
3、echanical and electrical connections. The antenna is small in size but will give big beam performance. -1- / -2- CHAPTER 2 Preparation for Assembly FOR OUR OVERSEAS CUSTOMERS: If you use the Metric System, see the American- toMetric Conversion Table in the rear of this manual. The United States uses
4、 American units of weights and measures The assembly of this antenna will be easier if you read this manual completely through at least three (3) times before beginning assembly. Allow at least 3 hours for assembly. Double and triple check ALL dimensions after Choose a large, clear area to assemble
5、the TH2MK3-S. The area must be at least 6x 30 (1.83 m x 9.14 m). You may wish to use sawhorses or chairs to support the boom during assembly. An alternate method involves driving a 5 (1.5 m) length of mast material into the ground and attaching the boom and boom-to-mast bracket to this mast temporar
6、ily during assembly. This permits eye-level installation of parts and allows easy alignment of elements after assembly. If you assemble this antenna over a grassy area, precautions should be taken so that hardware is not accidentally lost during assembly. A Tools: The following tools are required fo
7、r easy assembly of the TH2MK3-S. QTYType Tool 1Tape Measure, 12-foot 2Adjustable Wrench, 8 inch 1Nut Driver, 7/16 inch 1Nut Driver, 3/8 inch 1Nut Driver, 5/16 inch 1Sd d Hd Pli When unpacking your antenna, check inside of all tubing parts (traps, smaller tubing, etc.). To conserve space, these small
8、er articles are sometimes put inside larger pieces. Check all parts against the Parts List to make sure no parts are missing All tubing supplied with the TH2MK3-S tele- scopes together. Make all measurements to the given dimensions, plus or minus, no more than 1/8 inch! NOTE: An extra Figure 6 has b
9、een inserted in this manual for use when assembling the antenna Assembly of the Boom-To-Mast Brackets and Boom Select the boom-to-bracket clamp parts (Item Nos. 44 and 43). Loosely assemble them on the boom ends (Item No. 11), as shown in Figure 1. Line up the holes on both brackets and both boom en
10、ds. Secure the two brackets together with four (4) 1/4 - 20 x 3/4 bolts, nuts and lockwashers. Secure the brackets to the boom ends using the 5/16-18 x 2 3/4 b lttd lkhTi htthi NOTE: One end of the boom has three holes drilled. These holes must face up (skyward) when the boom is assembled in the boo
11、m-to- mast bracket. These holes will be used to attach the beta match in a later step as shown i Fi2 Assemble the two cast aluminum brackets (Item No. 10) on the mast at the desired height above your tower. Secure the two brackets together using the two (2) 5/16-18 x 31/2 bolts, nuts and lockwashers
12、. You may wish to drill a hole through your mast so that the remaining 5/1618 x 31/2 bolt may be inserted through the cast brackets and the mast and tightened. This bolt will prevent the antenna from twisting on the mast in high winds. See Figure 1. The four (4) inch bolts ItemItem No.DescriptionNo.
13、Description 10Bracket, mast, cast aluminum39Lockwasher, split, 5/16 11Boom Assembly, 2 x 7240Nut, hex, 5/16-18 33Bolt, hex head, l/4-20 x 3/441Bolt, hex head, 5/16-18 x 31/2 35Lockwasher, internal, 1/442Bolt, hex head, 5/16-18 x 2 36Nut, hex, 1/4-2043Clamp, boom-to-bracket 38Bolt, hex head, 5/16-18
14、x 544Bracket, casting-to-boom Figure 1 Boom-to- Mast Bracket AO-390S-B-008 ItemItem No.DescriptionNo.Description 10Bracket, mast, cast aluminum43Clamp, boom-to-bracket 11Boom Assembly, 2 x 7244Bracket, casting-to-boom 22Caplug, 2 Figure 2 Assembly of Boom Element-to-Boom Brackets To save time, loose
15、ly assemble all of the ele- ment-to-boom brackets and their appropriate hardware before beginning further installation of the antenna. See Figure 3. 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
16、do so. AO-390S-B-009 NOTE: The #13 and #14 brackets use the same size bolts, lockwashers and nuts -identical ItemItem No.DescriptionNo.Description 1Tube, slotted, 11/4 x 4833Bolt, hex head, 1/4-20 x 2Bracket #13, reflector-to-boom35Lockwasher, internal, 1/4 3Bracket #14, driven element-to-boom36Nut, hex, 1/4-20 15Insulator, driven element37Nut, square, 1/4-20 32Bolt, hex head, 1/4-20 x 3/8 Figure 3 Element-to- Boom Brackets Installation of Tu
