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[Page 1] SteppIR 3 Element Yagi
3 Element Yagi Instruction Manual Revision 3.0 Sept 2012 2112 116TH AVE NE SUITE 1-5, BELLEVUE WA, 98004 WWW.STEPPIR.COM TEL: (425)-453-1910 FAX: (425)-462-4415 ...
[Page 2] SteppIR 3 Element Yagi
SteppIR Antennas - 3 Element 2 Topic Page 3 El Yagi component check 3 Assembly kit materials lists 4 SteppIR acronyms 5 SteppIR “Why...
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SteppIR Antennas - 3 Element 4 Assembly Kit Materials List QTY PART NUMBER DESCRIPTION 1 70-1102-21 Terminal Housing 1.5” 1 60-6000-35 3” HOSE CLAMP 1 20-6020-12 12-POSITION TERMINAL STRIP 1 20-6020-01 1-POSITION TERMINAL STRIP...
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SteppIR Antennas - 3 Element 5 Abbreviations EST Element Support Tube EHU Element Housing Unit QD Quick Disconnect Boot (rubber) QD EHU EST ...
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SteppIR - Why Compromise? The SteppIR antenna was originally conceived to solve the problem of covering the six ham bands (20m, 17m, 15m, 12m, 10m and 6m) on one tower without the performance sacrifices caused by interaction between all of th...
[Page 7] SteppIR 3 Element Yagi
SteppIR Antennas - 3 Element 7 SteppIR Design Currently, most multi-band antennas use traps, log cells or interlaced elements as a means to cover sev- eral frequency bands. All of these methods have one thing in common–they significantly c...
[Page 8] SteppIR 3 Element Yagi
3 element Yagi Installation Note: If you have the 40m - 30m dipole kit some of the standard 3 element assembly parts will also be in this box. It is much easier to put the antenna together right than figure it out what you did wrong after it...
[Page 9] SteppIR 3 Element Yagi
SteppIR Antennas - 3 Element 9 2 2 3 31 1 Splice Splice Splice Optional 6m Passive 112 in. Long Director Driven Reflector 89.5 in. 102.5 in. 31 in. From center of driven element to center of 6m passive element 3 Element Yagi Spac...
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SteppIR Antennas - 3 Element 12 CONNECTING THE CONTROL CABLE TO THE D25 SPLICE ...
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Connect the Boom to the Mounting Plate The mast plate has a total of eight pre-drilled holes. Four are used for the 2” stainless steel mast clamps and four more are used for the 1-3/4” stainless steel boom clamps. Connect the mast to the...
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Attach the antenna housing to the element-to-boom bracket Place the flat side of the element housing unit (EHU) on top of the element boom brackets (Figure 9). Note: If the mounting holes for the element housing do not line up with the ho...
[Page 16] SteppIR 3 Element Yagi
SteppIR Antennas - 3 Element 16 Connect the wiring and secure to boom WARNING: Make sure the 25-pin sub-D connector is not connected to the controller if the 24 VDC supply is energized and plugged into the controller. There are voltages pre...
[Page 17] SteppIR 3 Element Yagi
When the connections have been secured, you will want to position the cables so that they are parallel with the 12 position terminal strip (Figure 15). The 12 conductor cable will be at one side, and the 3 four conductor cables will be at the ot...
[Page 18] SteppIR 3 Element Yagi
SteppIR Antennas - 3 Element 18 OPTIONAL CONNECTOR JUNCTION BOX WIRING LAYOUT* *This drawing is here for your convenience—refer to the actual accessory Connector Junction Box instructions for more detail. ...
[Page 19] SteppIR 3 Element Yagi
Attach the wiring enclosure and control cable to the boom or mast Position the plastic enclosure in a convenient position on the boom or mast making sure that the cut out in the cap is facing downward (Figure 18). We do not seal the enclosure so...
[Page 20] SteppIR 3 Element Yagi
SteppIR Antennas - 3 Element 20 Prepare the Fiberglass Element Support Tubes (standard poles) Note: If you have ordered the optional 40m - 30m Dipole Kit you need to refer to the section on preparing the poles (ESTs) in that specific manual....
[Page 21] SteppIR 3 Element Yagi
On all elements we now include double wall polyolefin heat shrink, part number #03630. Each tele- scoping pole uses 3 pieces of the 1.5” x 3” long heat shrink, which forms an adhesive bond that is heat activated. Once finished, the seal is sec...
[Page 22] SteppIR 3 Element Yagi
70-1007-01 FOAM PLUG ASSEMBLY Each 20m-6m element tip requires a breathable foam plug to be inserted onto the tip end of it so that the element is allowed to vent, but not let any non-liquid enter into the antenna. The foam plug assembly is N...
[Page 23] SteppIR 3 Element Yagi
Attach the Fiberglass Element Support Tubes to the Element Housing Units The butt ends of the green fiberglass poles may very slightly in outside diameter. Some of them may have been sanded, while others were not. The colors at the ends will be...
[Page 24] SteppIR 3 Element Yagi
SteppIR Antennas - 3 Element 24 Optional 6 Meter Passive Element The 6 meter passive element comes in 3 pieces. The main body with a 1/2” x 58” element section at- tached to it, and two 3/8” element sections (Figure 27). The overall le...
[Page 25] SteppIR 3 Element Yagi
SteppIR Antennas - 3 Element 25 SteppIR Performance SteppIR antennas are developed by first modeling the antenna using YO-PRO and EZ-NEC. We cre- ated antennas that had maximum gain and front to rear without regard for bandwidth. The ante...
[Page 26] SteppIR 3 Element Yagi
SteppIR Antennas - 3 Element 26 RF Power Transmission with the SteppIR Yagi The RF power is transferred by brushes that have 4 contact points on each element that results in a very low impedance connection that is kept clean by the inherent wi...
[Page 27] SteppIR 3 Element Yagi
Yagi Gain / Front to Back Modeling SteppIR antenna designs are all close to 22 ohms at all frequencies, so we needed a broadband match- ing system. We found an excellent one designed by Jerry Sevick, that is described in his book “Building...
[Page 28] SteppIR 3 Element Yagi
Fixed Element Spacing and the SteppIR Yagi First of all, there really is no "ideal" boom length for a Yagi. To get maximum gain the boom of a 3 element beam should be right around .4 wavelengths long. This would allow a free space gain ...
[Page 29] SteppIR 3 Element Yagi
SteppIR Options 40m - 30m Dipole (loop) “Y” Cable Transceiver Interface (Rig Specific) 6m Passive Element Kit SteppIR Antennas - 3 Element 29 ...
[Page 30] SteppIR 3 Element Yagi
Voltage Suppressor & RF Bypass Unit ( 16 Conductor) * Connector Junction Box *High Wind Kit (2E and 3E) Element Expansion Kit Dipole to ...
[Page 31] SteppIR 3 Element Yagi
SteppIR Antennas - 3 Element 31 STEPPIR ANTENNAS LIMITED PRODUCT WARRANTY Our products have a limited warranty against manufacturers defects in materials or construction for two (2) years from date of shipment. Do not modify this product o...
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2112 116TH AVE NE SUITE 1-5, BELLEVUE WA, 98004 WWW.STEPPIR.COM TEL: (425)-453-1910 FAX: (425)-462-4415 ...
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