Cal-Av Labs 2D-40A User Manual Download Page 9 | Manualshive

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Revised 14 June 2003

9

Note:

If the antenna is to be painted, now is the time to paint the boom.

However, if you do paint the boom at this time be sure to take steps to
mask the hairpin assemblies and connecting straps so that they do

not

get painted. See APPENDIX F, “PAINTING INSTRUCTIONS”.

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Summary of Contents for 2D-40A

Page 1: ...n is by means of an SO 239 UHF receptacle located in the RF neutral section of the forward hairpin This patented feed phasing and matching system also functions as a wide band high power balun Also be...

Page 2: ...e are available from tool and hardware stores Use the appropriate size nozzle for the size rivet being pulled Note Riveting hand tools of the 20 35 class are the minimum that will give satisfactory re...

Page 3: ...setting Element pieces have been marked for re assembly with markings on both sides of each joint Note Element naming and marking convention is as follows Imagine that you are standing at the front of...

Page 4: ...from between the metal pieces at points of contact and to protect the electrical connection from oxidation We recommend using pure heavy silicone grease for this purpose Contact between element pieces...

Page 5: ...Note There is an additional much smaller hole in line with one of the three lines of rivet holes It is a drain to keep water from accumulating at the joint These drain holes must face downwards when t...

Page 6: ...m when the antenna is in position for use This is to make sure that even if a nut comes off the bolt will remain in the coupler and that the elastic material in the stop nut is not directly exposed to...

Page 7: ...mounting plate where each of the threaded legs of each U bolt will receive a 3 8 split ring lock washer then a flanged 3 8 nut Leave the nuts at the end of the threads at this time 2 When all four U b...

Page 8: ...he copper straps to the welded tab at the end of each hairpin tube The order of hardware for the 10 24 stainless screws in the insulating block is as follows 1 The head of the screw is on the side of...

Page 9: ...is to be painted now is the time to paint the boom However if you do paint the boom at this time be sure to take steps to mask the hairpin assemblies and connecting straps so that they do not get pai...

Page 10: ...a 2 inch visible section of fiberglass connector piece between B1 and A1 tubes should be centered on the mounting plate b Adjust gray slotted plastic insulator sleeves so that they are centered under...

Page 11: ...its operating position 4 Install a flat washer a split ring lock washer and a nut on each bolt and tighten 5 After the element is secured in place on the mounting plate install the following hardware...

Page 12: ...n sense and great care These will get your new antenna into the sky without damage to it or to you If you are not experienced with installation of larger antennas we strongly recommend that you get so...

Page 13: ...163 pounds including mounting plates and hardware Projected area 16 8 square feet Wind survival no ice 100MPH 85 Knots Electrical Specifications Operating Bandwidth For 2 6 1 VSWR 295 kHz 36 of the ra...

Page 14: ...hieved in practice will be affected by many aspects of the actual site where the antenna is installed All patterns modeled over ground use 5 milliSiemens for earth conductivity and 13 for earth dielec...

Page 15: ...Revised 14 June 2003 B 2 Figure 2 B 2D 40A Elevation Plot antenna mounted 70 feet above earth Figure 3 B 2D 40A Azimuth Plot antenna mounted 70 feet above earth...

Page 16: ...er bandwidth between the 2 1 VSWR points This is due to measurements being taken at the transmitter end of fairly long pieces of coax and to coupling of the antenna to the stuff in its near field regi...

Page 17: ...ngths not including portion telescoped into next larger sized tubing 42 59 15 15 18 19 27 50 5 66 in 52 in 72 in 436 5 in changes with tuning Individual tubing dimensions are exposed lengths not inclu...

Page 18: ...less 8 ea Nut elastic stop 1 4 20 stainless 8 ea Washer flat AN 960C416 stainless 1 assy PLATE FRONT ELEMENT MOUNTING consisting of 1 ea Plate Elem Mtg Stainless 0 375 thick weight 13 1 pounds DWG No...

Page 19: ...er Flat AN 960C416 1 ea Nut Elastic Stop 1 4 20 Stainless 2 ea Clamp hose all stainless 71 95 mm UPG P N 4150 1 assy REAR HAIRPIN consisting of 1 assy insulating bushing consisting of 1 ea Mtg Bracket...

Page 20: ...001 0001 2 ea Tube 2 25 dia 0 125 wall 58 75 overall 52 0 exposed 2 ea Tube 1 875 dia 0 125 wall 72 0 overall 66 0 exposed 2 ea Tube 1 50 dia 0 095 wall 47 overall 42 exposed 2 ea Tube 1 25 dia 0 083...

Page 21: ...be 0 75 dia 0 049 wall 21 0 overall 18 exposed 2 ea Tube 0 625 dia 0 049 wall 21 5 overall 19 exposed 2 ea Tube 0 50 dia 0 049 wall 29 5 overall 27 exposed 2 ea Tube 0 375 dia 0 035 wall 53 0 overall...

Page 22: ...system with the following characteristics 1 Physical spacing of the elements significantly less than 0 125 wavelengths for increased forward gain and conveniently a more compact boom The actual spaci...

Page 23: ...the array to drain off static charges survive lightning hits and provide useful non radiative top loading of the tower structure if required 8 The feed system provides a high quality DC short across t...

Page 24: ...red to in this appendix element lengths in inches are actually half lengths That is the element length dimension refers to the distance from the end of the outside tip section of the element to the ce...

Page 25: ...the shorting bar and does not include the length of the straps that connect the parallel tuning line to the element All of the above settings apply only to an antenna which has fixed element half leng...

Page 26: ...requency The 2D 40A antenna will move about 14 kHz per inch of element tip length change As you might expect the resonant frequency of the array will rise with shortening element lengths 7 If you abso...

Page 27: ...ement The matching front shorting bar should be set to a distance of 39 75 inches back from the element end of the parallel line on which the shorting bar slides Note that this distance is to the cent...

Page 28: ...subject to contaminants that would attack aluminum ocean air acid rain etc Other advantages include cleaner handling bare aluminum can be really dirty stuff protection and easy to disassemble locking...

Page 29: ...ment to the boom Balance it on a stepladder step so that it is about chest high Wipe the element down with a rag dampened with MEK Be sure to remove any silicone grease residue Be careful not to let t...

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