the DIP-30A Manual - CAL
Contents
1. 77222 m Good Ground 5m3 e 13 o Azimuth Plot DONE Elevation Angle 23 8 deg Page 9 of 9 VSWR DIP 30A Full Size Dipole Line Z 50 ohms 16 Ft 46 Ft 6 86 Ft 9 8 9 9 10 10 1 10 2 10 3 Frequency MHz Page 10 of 10 VSWR DIP 30A Full Size Dipole Line Z 72 ohms 16 Ft 46 Ft 6 86 Ft 10 1 Frequency MHz Page 11 of 11 APPENDIX C DIP 30A MECHANICAL DRAWINGS Under Construction Page 12 of 12 MOUNTING PLATE ASSY ELEMENT 1 1 4 12 ea 30 ea ea ea ea ea ea ea ea ea ea ea ea ea ea ea ea ea ea ea Appendix D DIP 30A PARTS LIST consisting of Plate Element to Mast 6 75 X6 X0 25 per drawing 000328 000 0001 REV A 00 0 6061 T6 Clamp assy 2 nominal stainless ASSY consisting of center insulating coupling Fiberglas 1 5 dia 8 long screw 10 24 2 5 long Phillips pan head stainless washer flat AN 960 10 stainless washer lock split ring 410 stainless insulator element mounting 1 75 nominal I D tube 1 875 dia 0 125 wall 58 overall 58 exposed tube 50 dia 0 095 wall 45 overall 42 exposed tube 25 dia 0 083 wall 62 overall 59 exposed tube 00 dia 0 049 wall 18 overall 15 exposed tube 0 875 dia 0 049 wall 18 overall 15 expos2. Complete pai if desired NOTE t with the 1 e a for the U bol hrough the U bolt clamps e a b mas mas ter mou the mast in The spac by 55 fee putting t this asse he ele ong eleme nd the di nt CS ment shou ll rivets uts and washers ar ment required for this procedure is about 5 feet wide long he mb 1 ym he el n of he pl on mensio onto PVC insulators ar ll the U bol Instal ld be al wil ligned so tha ll be facing dow accessibl This can be a driveway element on a couple of sturdy tables will make uch easier lement mou the plate late so th rooftop etc nting plate and position it parallel to the element at it is centered on the ac and throu n for into t torque turn more onto t ne The most popular mast diameter by far is 2 0 O D upplied as standard wit olts s TE sizes nting t such nnecting cable ug to BALUN co BALUN Installation Use a and great Sky without damage experienced with i that you get som Then you can help U bolts shoul nting of the See Appendix F n adequate nu cla t necessary he antenna nnection care T can be supplied ld be tightened j mp part of the U bol to just flatten the split ring lock washer his also applies he mast an elemen co connect a way that is not u Use
3. Rust Oleum TM gray automotive primer is great for this purpose it is very fast drying In fact it is rather wonderful for getting rid of the reflectivity glint of the entire beam Painting the balun will improve its resistance to sunburn Page 19 of 19
4. 3 of 3 FURTHER NOTE The elements are joined with closed end rivets The innermost few element pieces are joined with rivets that have a grip range appropriate for the combined wall thickness of the tubing involved The appropriate rivet part number will be marked on the element in red ELEMENT ASSEMBLY Prepare sturdy table or bench for antenna assembly Unwrap outer turns of black tape to release 2 smaller telescoped element pieces Untape 2 large diameter tubes Note tape is best removed by unwinding This will result in a minimum of tape residue on antenna elements Tape residue on elements can be removed with mineral spirits or WD 40 With mast clamp at center of table note method of pre assembly of element A1 to mast connector and mounting plate Carefully remove and save screw nuts and lock washers from Fiberglas connector piece Remove nuts and washers on U bolt for element Bl and remove insulator Slide insulator over end of element section marked B1 Slide tube end B1 over Fiberglas connector until the holes in the Fiberglas and element are aligned Legend B1 on Fiberglas and legend Bl on element should be facing in the same direction Insert screw for Bl connection in same direction as screw for Al connection Nuts lock washers and washers should be assembled to match pre assembled parts on Al connection with 10 24 nuts closest to fiberglass fully tightened
5. ELECTRICAL SPECIFICATIONS Gain 2 15 dBi 0 dBd this is a full size dipole Feed Point Impedance Approximately 73 Ohms This applies only at resonance and at recommended height above local earth Both resonant frequency and the resistive component of the feed point impedance are affected by the height above ground See VSWR Graph showing theoretical variation in these parameters over frequency for various mounting heights VSWR BANDWIDTH 2 0 to 1 or less over 600 KHz The the wil NOTE P1 antenna may also be fed with 50 ohm feedline If it is n the minimum VSWR when mounted at the recommended height l pe to l ase s patterns and graphs for more information NOTE CAL AV reserves the right to make and implement design improvements without notice Specificat ions updated 6 06 2000 Page 7 of 7 APPENDIX B DIP 30A PATTERNS AND GRAPHS Full Size Dipole oc 2 8 Freq 18 115 MHz B deg Gain 6 88 dBi gt Takeoff 29 deg 0 Bnuidth 35 5 deg 7 Es 3 13 8 49 3 deg Good Ground 5mS e 13 ART Elevation Plot Page 8 of 8 Full Size Dipole ees dB EZNEC 2 8 Mounted Height 46 Feet a j TU Freq 18 115 MHz Tee 0 es 90 278 98 deg Gain 6 88 dBi Bearing 98 deg gt Tot a MET oo F Side 18 24 dB l OCA T Bmuidth 86 6 deg
6. Place U bolt saddle between mounting plate and insulator Assemble U bolt using flanged nuts and lock washer Do not tighten U bolt yet Loosen U bolt nuts on A1 connection side and adjust as follows 2 inch visible section of Fiberglas connector piece between B1 and A tubes should be centered on small hole in mounting plate Adjust grey PVC insulators so that they are centered under U bolts Rotate element so that rivets will be at bottom edge when antenna is mounted on a mast The heads of the 10 24 screws will be in the Space between the mounting plate and the element with the nuts accessible for connecting the balun Tighten U bolt nuts by alternating so that approximately an equal amount of U bolt is visible on each side Continue to tighten until lock washer is flat and then 1 2 turn more This completes assembly of center section of antenna We are now ready to assemble remaining element pieces Continue the process of cleaning applying silicon grease matching markings and holes and riveting until both sides of the element have been assembled NOTE If the antenna is to be painted this is the time to paint the element along with the mast mounting plates and u bolts see Appendix F Painting Instructions Page 4 of 4 FINAL ASSEMBLY NOTE Place Lay th plate he el as vr che nugly nough half a clamps n T m n O S e NOTE Af co pl
7. other side of the element begins with B1 Bl and is marked in a similar pattern Page 2 of 2 JOINING PIECES Screws assembl Clean any dirt Except for the feed poi le joints dus nt joints which are fas as follows or tape residue from e d tened with 10 24 the outer surface of the small er diameter tubing to be joined To the extent also clea possible tub Tape residu mineral residue of W Use the part of supplied Sc th ube to may Oo be mated n the inside surface of asily be removed wi spirits on a piece of rag or paper D 40 or mineral spirits tch Brite pad to clean che th WD towel larger 40 or Remov the su This cleaning will any rface of the produce a uniform matte finish Wipe down Acetone stores in on the con h Methyl her of t cans Please read and underst ner regarding use of these solve Ethyl Ketone M EK pre wit Eit pin tai Apply the supplied silicone grease working i cleaned surface thoroughly The amount of si needed is just enough to create a film betwee of metal The grease serves to prevent galli moisture from between the metal pieces at poi and these is available from most ferred or hardware and the warnings nts t into the licone grease n the two pieces ng to exclude nts of contact to prote
8. smallest nozzle or hole selection for the 1 8 rivets Fl A rope bridle for lifting the assembled antenna F A hoisting rope G One or more TAG lines 3 16 or so for control of the antenna while hoisting GENERAL This antenna has been pre assembled at the factory and then disassembled for shipment However it may be a good idea to check the measurements on the elements during assembly The important measurements are those of the exposed lengths That is from the outer edge of an element component to the outer edge of the next larger one The centermost element pieces the ones that include the feed point terminals are exposed for their entire length Element exposed lengths can be found in Appendix D Parts List Element pieces are swaged at the last several inches farthest away from the center down onto the next smaller diameter element piece Sometimes the amount of size reduction due to the swage is just a few hundredths of an inch however the swage IS visible Beginning with the innermost element piece near the center and going toward the last element piece the tip each element piec fits into the swaged end of the preceding larger diameter piece Element pieces have been marked for re assembly with markings on both sides of each joint Beginning with A1 A1 at the Fiberglas connecting piece then A2 A2 at the next joint out then A3 A3 and so on The
9. which allow mounting the dipole on a 2 mast are supplied with the antenna Mounting plates for mounting the antenna on other sizes of masts are available from the factory The mounting plate includes insulators which electrically isolate the split element from the mast mounting plate A BALUN for coaxial cable feed is supplied with the antenna The BALUN incorporates a UHF receptacle for connection of the coax s UHF plug e g a PL 259 PHYSICAL SPECIFICATIONS Materials Elements Aluminum 6061 T6 Accessories Aluminum Steel and PVC Size Element Diameter elements taper from 1 875 inches to 0 375 inches Element Length 50 75 feet Element Sag 16 7 inches Turn Radius 25 38 feet Weight 21 5 pounds including mounting plates hardware and supplied 0 51b EB 1 BALUN Projected Area 4 2 square feet Page 6 of 6 WIND SURVIVAL The ante the alum the wors the elem correspo ice load nna is designed to reach the maximum allowable stress for inum material at an actual airspeed across the element in t case direction of 106 Miles Per Hour MPH We rate ent to survive exposure to an airspeed of 100 MPH This nds to a stress safety factor of 1 12 and does not take When ins ground Speed zo ing into account alled at the recommended 46 foot height above he antenna is rated for operation in a basic wind ne of 100 MPH under UBC 97 exposure C
10. CAL AV LABS INC Tucson AZ www cal av com USER MANUAL ASSEMBLY INSTRUCTIONS DIP 30A FULL SIZE 30 METER ROTATABLE DIPOLE Publication Date 2000 Oct 15 For Antennas Shipped after 2000 Oct 01 This manual is available at www cal av com no copy restriction DESCRIPTION The DIP 30A is a full size rotatable dipole for the 30 meter band It is noticeably quieter than a vertical And when mounted at the same feed point height it exhibits both higher efficiency and more gain directivity than an Inverted Vee It is about 50 feet in length and weighs 22 pounds including all mounting hardware and the EB 1 balun In no ice conditions wind survival is 100 MPH For more details see Appendices A B and Cs UNPACKING Inspect carton for any sign of shipping damage Then open carton and inspect contents for hidden damage Shipping damage is not a common occurrence but it does happen If damage is found notify the store or in the case of direct shipment to you notify the carrier Remove contents and inventory for the following 1 Large bundle of element pieces and mast to element mounting plate 2 EB 1 Balun Kit 3 Manual 4 Hardware Kit Page 1 of 1 ASSEMBLY Tools Required A Combination Wrench 9 16 inch B Screwdriver Phillips 42 C Nut Driver 3 8 D Hand rivet tool also known as POP or BLIND rivet tool These are available from tool and hardware stores Use the
11. antenna Space va through 7 oscillating about excursio he height Patterns and Grap element j mpedance At a hal tuner ns LMR 400 or RG 213 lue of 73 o hen to a va 3 ohms at o the 73 ns of these less than 20 ohms hms at half a wavelength lue significantly above 73 ne wavelength above ground ohm value at each half oscillations become smaller becomes r hs For ust above g is just und haracteristic impedance vs f wave abov mote from the ground see vertical operation with the round say 0 02 wavelength er 100 ohms minimum che height the yield a VSWR of 1 1 when fed with a 72 ohm followed with RG 11 to the antenna which are 50 ohm systems This is of no importanc For runs of more than 50 feet to the we recommend a high quality ffective ground feed For the minimum VSWR unless the feed large size cable such as TAKE OFF ANGLE CONTROL NVIS OPERATION For single lobes broadside to the element operated one half wavelength above effective ground probably the best a above this height center of the main 1 ll purpose height secondary lobes will begin to develop lobes will drop to a lower angle To raise the take off angle for Near NVIS above effec that is practically omni directional gap free communica ionospheric operation tive the dip nd T grou This will p cond lower anten d
12. by presenting a high impedance to RF currents flowing outside the coax shield This forces currents in each side of a driven element to be equal This is especially important in beam antennas because it prevents distortion of the beam s pattern caused by unequal currents in the driver s In a simple dipole the balun assures that the dipole and not the feed line is doing the radiating POSITION ON ANTENNA The balun should be oriented perpendicular to the driven element On beams after connection to the driven element it is usually secured to the main boom using the black UV resistant ties provided For wire antennas run the coax cable perpendicular to the wire usually straight down as far as practicable at least several feet Further on wire dipoles tie the balun up to the center insulator with dacron line etc to take any stress off the balun s wire leads Also tie the coax up to the insulator to relieve stress on the coax connector An adapter plate that serves this purpose and acts as a center insulator for wire dipoles is available from CAL AV LABS PREPARATION OF LEADS For beams cut leads to just reach the edge of the attaching screws for the driven element plus a very small additional length to allow reattachment of a terminal if it is damaged etc Keep balun lead length to a minimum If leads must be made longer than 2 inches then twist them together Run them up to th
13. ct the electrical connection from oxidization NOTE regrow its protective oxide coating Because freshly cleaned aluminum immediately begins to it is important to assemble t reason Afte toget not Care be useful rive set NOTE Rivet holes ar he joints TE ne or two within a few minutes of cleaning may be necessary to clean grease joints at a time r treatmen her with to allow a t assembl a rotary motion if necessary ny dirt or grit into the joint fully align the holes for ts in all them A tapered pin or center the initial alignment of the holes thr holes befor semi random drilled At the factory For this and fasten just the pieces by sliding them Be careful punch may Place setting any of them Then the joint was correctly assembled the first hole was drilled a rivet installed then th remaining holes drill ed with to each other he joined pieces unable to move relativ hen the one installed rivet was drilled out This rocess results in holes that ar ligned as possible With as nearly perfectly this process every joint in he assembly is unique and he two original pieces t otto OH cf he correct parts must be erfectly or very nearly so must be reassembled with only If the holes do not match then something is wrong identified and used and Page
14. e feed point where they should then separate and go directly away from each other and connect to the antenna terminals Check to make sure the terminals supplied will fit the beam manufacturers hardware The terminals Page 18 of 18 supplied are for 8 or 10 studs 8 32 10 24 screws etc We recommend lightly crimping the terminals to the wire then soldering using rosin flux solder This will produce a good gas tight connection For wire antennas you may want to solder the leads directly to the wire on either side of the center insulator or adapter plate Do NOT use the EB 1 by itself as a center insulator CONNECTIONS Connect the terminals to the driven element and tighten the hardware snugly Spray with a water repellent corrosion inhibitor if desired or paint however do not seal in such a way that water can be trapped On the coax end put a small amount of silicone grease on and around the pin of the PL 259 plug insert it into the balun and tighten firmly with finger torque only do not use pliers The coax connection may be sealed with coax seal if desired however the silicon grease will exclude water from entering Make sure that no silicone grease gets on the outer surface of the coax plug if coax seal is to be used PAINTING The balun may be painted either before installation taking care to mask off the coax connector or it may be painted in place on the beam
15. ed tube 0 75 dia 0 049 wall 21 overall 18 exposed tube 0 625 dia 0 049 wall 22 overall 19 exposed tube 0 50 dia 0 049 wall 30 overall 27 exposed tube 0 375 dia 0 035 wall 58 overall 55 exposed NOTE Rivet Aluminum Note BALUN Rivet Aluminum c Rivet Aluminum c All element tubing material is 6061 losed end losed end closed end Rivets used to fas inclusive are 5 32 diameter is marked in red on each joint use AD42H rivets 1 8 diameter Cal Av Labs Model EB 1 Emhart AD55H Emhart AD53H Emhart AD42H T6 5 32 dia 5 32 dia 1 8 dia ten joints A2 B2 out to A4 B4 The rivet part number The remaining joints with installation kit Page 13 of 13 APPENDIX E OPERATIONAL NOTES FEEDPOINT IMPEDANCE mp nd nd trey EaP Opp c ttmimoroiH ne tal his is a function of height above ground mpeda horizon nce of a dipole in free space is approximately 73 ohms dipole is raised from j da hroug bove effective ground t hms avele ppendix B ower nc ht The feed point As ust above the ground its increases from a very low value he fr the on ngth The smaller as t n back so tip of an feed point i VSWR Because of the c VSWR will vary antenna will system e a g most installatio will be about 1 4 1 line is very lossy
16. ish then washed with MEK until Ihe plate can The element is prepared for painting after assembly 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 the MEK drain into the joints Clean th xposed surfaces of the entire element using a Scotch Brite pad Clean to produce a uniform matte finish Then wipe down with MEK until no more aluminum residue shows on the cleaning towel Page 17 of 17 APPENDIX G INSTALLATION PROCEDURE EB 1 BALUN GENERAL DESCRIPTION The EB 1 is an external bead balun It is constructed of a length of teflon coaxial cable surrounded by 50 ferrite beads At one end of the cable is a UHF coax connector that mates with the popular PL 259 cable end connector at the other end are wire leads to facilitate connection to a dipole or driven element The wire leads are color coded for ease of phasing multiple elements or antennas white coax center CAL AV LABS baluns are vacuum impregnated and sealed against weather The exterior surface is paintable Freq range 1 8 through 60 Mhz Power 2 500W CW 3 000W PEP See derating schedule overleaf A balun s purpose is to allow connecting a BALanced load e g a dipole or driven element to an UNbalanced line thus the name In transmitting antennas this is accomplished
17. o light against a dark sky Second it is protected from weathering particularly if its surrounding area is subject to contaminants that would attack aluminum sea air acid rain etc Other advantages include cleaner handling bare aluminum can be really dirty stuff protection and easy to disassemble locking of mounting hardware protection of cables baluns etc from the effects of sunlight and as mentioned above some reduction of static from raindrops DISADVANTAGES Labor and cost of painting materials Materials Required 1 Scotch Brite pad general purpose hand pad maroon This pad is included with each antenna in the hardware Kit 2 Clean soft rags or paper towels 3 Acetone or Methyl Ethyl Ketone MEK latter preferred Page 15 of 15 PAINTING Follow the instructions other than for surface prep on the can Be sure to use several even light sprays close enough to produce a wet shiny coat but not so thick that it runs Touch up can be at any time A second coat is recommended at least 15 minutes after the first For the element a good approach is to spray on side then th other When dry enough to handle rotate the element 90 degrees and spray each side in the new position the top and the bottom what were acetone dampened rag Mask off any connection that will be made after th lement is attached as well a
18. s the feed point connector Remember that if you goof this primer can be removed with an Light Gray Primer Rust Oleum No 2081 Available at Home Depot large hardware stores and some paint stores No recommended substitutes at this time BACKGROUND This primer is light gray a color that is being used more and more for power pole insulators transformers etc for looking less obtrusive against an average sky Read instructions on paint can thoroughly disregard the part about surface preparation which was written for steel automotive bodies This particular primer has some very nice attributes Among them are that it can easily be removed with acetone even after it is dry and that it is very easy to touch up while wet after it s dry or days later It will oxidize a bit after years in the sun even then it can be cleaned with an MEK dampened rag just enough to remove dirt and some of the oxidized paint and then repainted W recommend two coats at least 15 minutes apart SURFACE PREPARATION and aluminum plate and tubing dry before painting In this case the surfaces to be painted are stainless steel The hardware can just be wiped down with MEK and allowed to The aluminum plate should be cleaned with Scotch Brite to a no more d aluminum residue shows on the cleaning towel then be hung using a piece of wire and painted Page 16 of 16 ull uniform fin
19. silicone grease inside the connecting cable to exclude hardware and connec Painting Instr mber of people hese will get your to it or you nstallation of ante h centered over the holes s over the PVC insulators gh the holes in the plate n the 10 24 he nuts when it is in place o for drainage and the connecting the balun ust enough to pull the insulator clamp This is usually plus tightening the U bol T CO The U h the DIP 30A is for this size t to mast plate for other common ntact the factory the BALUN and secure it to nder stress from the moistur S ndix G App tions near t uctions he mast patience common sense new antenna into the you are not yet nnas we recommend If xperienced help for newcomers the first few times BE PARTICULARLY CAREFUL WITH REGARD TO WORKING ON TOWERS AND NEAR POWER LINES Page 5 of 5 APPENDIX A SPECIFICATIONS DIP 30A DESCRIPTION The DIP 30A is a rotatable dipole for the 30 meter amateur band It is an unloaded full size element It is noticeably quieter than a vertical and when mounted at the same feed point height exhibits both higher efficiency and more gain than an Inverted Vee It is constructed of multiple sections of 6061 T6 aluminum tubing Successively smaller sections are used from the center toward the tips of th lement resulting in a tapered element A mounting plate and hardware
20. uring NVIS antenna sho a height of losses due na heig operatio uld be one eigh to absorp itio ht n th used tion out to several hundred miles whe ns support NVIS operation on this band is desired for improved signal to the antenna should be This is As the dipole is raised and the Vertical Incidence Skywave ole should be lowered to a quarter wave vertical lobe and which will produce n roduce a broad If a na separat low height rece Lowering the transmitting ante Page 14 of 14 noise iving nna below th of a wavelength will greatly increase tion by the earth APPENDIX F PAINTING INSTRUCTIONS GENERAL Should you paint your antenna We think so but it s your decision Here are the facts OPERATIONAL EFFECTS Nil a thin dielectric coating paint between the metal and the air does cause changes but they would be very difficult to measure for antennas of this size A slight reduction in precipitation static may be noticed ADVANTAGES There are two primary advantages to painting an antenna First its visual impact is mitigated because the recommended paint is flat eliminating the glint associated with aluminum ven so called low glare treatments Further the recommended paint is very close to the color and gray scale of power company pole mounted transformers and modern insulators this results in it not being too dark against a light sky nor to
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