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Dipole Installation 

 
Attach antenna housing  to a 1-3/4” mast (not included) using the 1-3/4” U-bolts and saddles. 
(Figure 23, 35, 26 and 27

Dipole SWR Considerations 

 

The impedance of a half wave horizontal dipole depends on it’s height above ground.  In the frequency 
range of 14 to 28 MHz, the typical height of an amateur radio antenna is between 1/2 and 1 wavelength 
above ground.  At these heights the impedance of a horizontal 1/2 wave dipole is in the vicinity of 70 
to 80 ohms.  When the antenna is mounted at heights greater than 1/2 wavelength, it should exhibit an 
SWR of less than 1.5 to one.  At lower heights, the SWR may be higher.

 

SteppIR  Antennas - Dipole 

 12 

Figure 25 

Figure 23 

Figure 27 

Figure 26 

Содержание 80m Dipole

Страница 1: ...Instruction Manual Revision 02 22 08 Patent Pending Yagi Dipole Vertical Patented SteppIR Antennas 2112 116th Ave NE Suite 2 5 Bellevue WA 98004 Tel 425 453 1910 Fax 425 462 4415 Tech Support 425 891 6134 www steppir com ...

Страница 2: ... EHT Element Housing Tube EHU Element Housing Unit EST Element Support Tube pole FCC Flexible Connection Coupler rubber EST EHU EHT FCC SteppIR Antenna Information Web Sites as of 4 09 07 http steppir com http groups yahoo com group steppir ...

Страница 3: ... solve the fre quency problem and in addition would have vastly improved performance over existing fixed length yagis The ability to tune the antenna to a specific frequency without regard for band width results in excellent gain and front to back at every frequency The SteppIR design was made possible by the convergence of determination and high tech materials The availability of new lightweight ...

Страница 4: ...o index very accurately thus giving very precise control of each element length In addition the motors are brushless and provide extremely long service life The copper beryllium tape is driven out into a hollow fiberglass elements support tube see below forming an element of any desired length up to the limit of each specific antenna model a vertical uses only one side The fiberglass elements supp...

Страница 5: ...ecure to Boom 6 Control Cable Schematic 7 Prepare the Telescoping Fiberglass Element Support Tubes EST 8 Attach the Fiberglass Element Support Tubes to the Element Housing Units 11 Dipole Installation 12 Dipole Mast Plate Drawing 13 SteppIR Notes 14 6 Meter Passive Element Installation optional 14 SteppIR Warranty 15 Topic Page ...

Страница 6: ...3 volt power supply This will then allow up to 500 of control cable with no problems Be sure to connect the controller case to your station ground using the 8 32 lug on the back of the controller This is important for RFI immunity as well as lightning protection If you are in a high lightning area take the appropriate precautions the controller can be damaged by lightning it is be yond the scope o...

Страница 7: ...loop at the mast to allow for the turning of the rotor SteppIR Antennas Dipole 7 Black Red Green White 1 2 3 4 Shield Solder Drain to Connector Case Male 25 Pin D sub 4 pin Weatherproof 1 2 3 4 1 2 3 4 4 pin pinout viewed from the solder side Assemble over cable before soldering Black Red Green White Control Cable Schematic Figure 3 Figure 5 ...

Страница 8: ...heir element housing unit EHU Repeat the following procedure for each telescoping pole Telescope a pole to full length by pulling each section out firmly in a twisting motion until it is ex tended as far as possible Each segment is tapered and should lock securely in place when fully ex tended Pole lengths may vary but when fully extended each pole must be at least 17 feet 8 inches in length as me...

Страница 9: ...ition Next wrap each joint on the fiberglass poles with the all weather electrical tape see Figure 9 Each joint should have at least the full width of the tape on both sides of the joint Use common sense on the amount of tape or you will not have enough of the silicon tape used later to cover the electrical tape Exception On joints with reinforcing rings the tape must continue further so it extend...

Страница 10: ...Take care to keep the silicone wrap free of dirt or debris Also this tape MUST be cut Do not tear it Wash your hands before completing the following steps Position the black silicone tape about 1 2 to the right of the black electrical tape and wrap one layer continually stretching the silicone tape a minimum of 100 its original length completely around the pole so the tape fully overlaps itself Th...

Страница 11: ...s very important to ensure that the butt end of the EST firmly bottoms out inside the EHT Make sure the EST is seated all the way into the EHT Then push the rubber boot firmly onto the EHT until the hose clamp is past the aluminum ring and will clamp down onto the fiberglass EST The correct mounting position of the rubber boot is shown in Figure 21 It is imperative that the stainless steel hose cl...

Страница 12: ...e frequency range of 14 to 28 MHz the typical height of an amateur radio antenna is between 1 2 and 1 wavelength above ground At these heights the impedance of a horizontal 1 2 wave dipole is in the vicinity of 70 to 80 ohms When the antenna is mounted at heights greater than 1 2 wavelength it should exhibit an SWR of less than 1 5 to one At lower heights the SWR may be higher SteppIR Antennas Dip...

Страница 13: ... mast not supplied not a production part Layout provided for customer con venience and use only Ø 200 X 12 R 1 000 14 400 2 450 3 200 3 100 3 200 Ø 430 X 4 6 775 2 565 3 113 2 565 2 738 1 637 1 750 1 226 370 Ø 344 X 4 C L 380 390 380 390 Material 3 16 5053 Aluminum Figure 29 ...

Страница 14: ......

Страница 15: ... limited warranty is automatically void if the following occurs improper installation unauthorized modifications physical abuse or damage from severe weather beyond the manufacturer s control Manufacturer s responsibility is strictly limited to repair or replacement of defective components The shipping instructions will be issued to the buyer for defective components and shipping charges will be p...

Страница 16: ...Yagi Dipole Vertical www steppir com 40m 30m Dipole Option ...

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