SteppIR 2 Element Yagi Manuel utilisateur

2 Element Yagi Instruction Manual

(Patented)

Yagi



Dipole



Vertical

Revised 2/22/08

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

SteppIR Antennas - 2 Element 2

Abbreviations

EST Element Support Tube

EHU Element Housing Unit

FTP Fiberglass Telescoping Pole

QDB Quick Disconnect Boot (rubber)

FTP

EHU

EST

QDB

SteppIR Antenna Information Web Sites(as of 4/09/07)

http://steppir.com/

http://groups.yahoo.com/group/steppir/

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 the required antennas.

Yagis are available that cover 20 meters through 10 meters by using interlaced elements or

traps, but do so at the expense of significant performance reduction in gain and front to back

ratios. With the addition of the WARC bands on 17m and 12m, the use of interlaced elements

and traps has clearly been an exercise in diminishing returns.

Obviously, an antenna that is precisely adjustable in length while in the air would 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 glass fiber composites, Teflon blended thermo-

plastics, high conductivity copper-beryllium and extremely reliable stepper motors has allowed

the SteppIR to be a commercially feasible product.

The current and future SteppIR products should produce the most potent single tower antenna

systems ever seen in Amateur Radio! We thank you for using our SteppIR antenna for your

ham radio endeavors.

Warm Regards,

Mike Mertel

Michael (Mike) Mertel - K7IR

President

SteppIR Antennas - 2 Element 3

SteppIR Antennas - 2 Element 4

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 compromise

performance. The SteppIR™ antenna system is our answer to the problem. Resonant antennas must

be made a specific length to operate optimally on a given frequency.

So, instead of trying to “trick” the antenna into thinking it is a different length, or simply adding more

elements that may destructively interact, why not just change the antenna length? Optimal perform-

ance is then possible on all frequencies with a lightweight, compact antenna. Also, since the SteppIR

can control the element lengths, a long boom is not needed to achieve near optimum gain and front to

back ratios on 20 - 10 meters.

Each antenna element consists of two spools of flat copper-beryllium tape conductor (.54” Wide

x .008” Thick) mounted in the element housing unit. The copper-beryllium tape is perforated to allow

a stepper motor to drive them simultaneously with sprockets. Stepper motors are well known for their

ability to 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 support tubes (poles) are telescoping, lightweight and very du-

rable. When fully collapsed, each one measures approximately 48” in length. Depending on the

model, their may be additional extensions added to increase the overall element length.

The ability to completely retract the copper-beryllium antenna elements, coupled with the collapsible

fiberglass poles makes the entire system easy to disassemble and transport.

The antenna is connected to a microprocess

or-based controller (via 22 gauge conductor cable)

that offers numerous functions including dedicated buttons for each ham band, continuous

frequency selection from 40m to 6m (depending on the model). There are also 17 ham and 6

non-ham band memories and you can select a 180° direction reversal* or bi-directional*

mode and it will adjust in just about 3 seconds (* yagi only).

Boo m

Elem ent Ho using Unit

Elem ent Support T ube

Stepper Drive M o to r

C opp er B ery llium Tap e

Copper-Beryllium Tape

SteppIR Antennas - 2 Element 5

Table of Contents

Topic Page

Abbreviations 2

SteppIR “Why Compromise” 3

SteppIR Design 4

Table of Contents 5

2 element Yagi Installation 7

Boom Assembly 7

Element Spacing and Installation Layout 8

Connect the Boom to the Mast Plate 9

Determining the Direction of the Antenna 9

Attaching the Element Housings to the Element Bracket 10

Connect the Wiring and Secure it to the Boom 11

Attach the Wiring Enclosure & Control Cable to the Boom 13

Preparing Telescoping Fiberglass Poles (EST) 14

Install the Telescoping Fiberglass Poles (EST) 17

Optional 6 meter passive element installation 18

SteppIR warranty 19

SteppIR Antennas - 2 Element 6

2 Element Yagi Installation

The 2 element SteppIR Yagi boom consists of two sections of aluminum tubing that are 57 inches long x

1-3/4” OD x 1/8” wall, along with two aluminum antenna housing brackets as shown in Figure 1. The ele-

ment housing brackets are pre-installed at the factory. To assemble your antenna, you will need a

1/2” (13 mm) and 7/16” (11 mm) wrench and / or socket drive. We double check the fasteners for proper

tightness before shipping but it is always a good idea to check them yourself before installing the antenna.

Put anti-seize grease on all bolts 1/4” or larger, especially on the u-bolts because it greatly increases their

gripping power. Anti-seize grease (molybdenum based) is available at most auto part stores.

Assemble the Boom & Connect to Mast Plate

The boom is completely assembled and drilled at the factory to assure precision element alignment. Pre-

drilled holes are quite snug to align almost perfectly. In some cases you may find it necessary to assist the

bolts with a tap of a hammer, or “thread” them in by turning with a wrench.

Connect the boom by sliding the two sections together and align the pre-drilled holes (Figure 3 and 5). Re-

fer to Figure 9 for correct configuration. It is advisable to spray a small amount of WD-40 on the male

sleeve before sliding the female section onto it. Do not twist the aluminum excessively, as this can cause

binding - the WD-40 will help keep the two pieces lubricated.

Note: The boom bolts need to have a total of “5” flat washers on each bolt to prevent the nut from bot-

toming out at the end of the threads before it is tight.

Insert the included bolts into the pre-drilled holes, and tighten the Nylok nut securely (Figure 7).

Note: If you are not installing the 40m-30m dipole kit you can remove the return bracket if you want to. If

you do remove the bracket it is a good idea to mark both the boom and the bracket so that it can be

reinstalled correctly later if needed.

SteppIR Antennas - 2 Element 7

Figure 1 Director

Driven 40m– 30m Return Bracket

Figure 5

Figure 3

Figure 7

SteppIR Antennas - 2 Element 8

Figure D.2

2E With 40m-30m Dipole Kit

(not to scale)

2E Without 40m-30m Dipole Kit

(not to scale)

Optional 6m Passive

114 in. Long

Director Driven

57in.

22 in. From center of driven element

to center of 6m passive element

Boom / Mast Plate

Mast

Splice

Optional 6m

Passive

114 in. Long

Director Driven

57in.

22 in. From center

of driven element to

center of 6m

passive element

Boom / Mast Plate

Mast

Splice

30 in. From center of

driven element to center

of return element

40m - 30m Return

Mounting Plate

Figure 9

Connect the Boom to the Mast Plate

The mast plate (Figure 11) 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.

Note: If you are installing a 40m-30m Dipole kit reference the 40m-30m Instruction manual for

proper mast plate placement.

Connect the mast to the mast plate using the included 2” stainless steel U-Bolts, with saddles, and Ny-

lok nuts as shown in Figure 13. Tighten securely.

Note: If you are going to do this on the tower it is advisable to test each U bolt for a proper fit,

Before you go up the tower, and bend if necessary to ensure ease of assembly when you

are on the tower.

Connect the boom to the mounting plate on the opposite side of the mast ( Figure 13 and 15), using the

1-3/4” U-bolts, saddles, and nuts. Align the boom so that the element brackets are level, then tighten

securely. The antenna balance point is at the center of the boom. To ensure a balanced weight load,

the center of the mast plate should be at the center balance point of the boom.

Determining the Direction of the Antenna

The SteppIR Yagi has three “directions” in which it can be used. Normal, 180 degree and bi-

directional. When the antenna is installed on its mast the passive element should be facing the direction

the rotator indicates.

•In the normal mode the antenna directs RF energy towards the passive element (the element that

does not have the coax attached to it), giving gain in that direction and rejecting signals coming di-

rectly at the driven element from the opposite direction.

•In the 180° mode the gain is now directed from the driven element end and rejected from the pas-

sive end.

•In the Bi-Directional mode, your antenna is directing RF in both directions.

SteppIR Antennas - 2 Element 9

Figure 13 Figure 15

Figure 11

2” Mast

1-3/4 Boom 1-3/4 Boom

Attach the Element Housing to the Element Bracket

Place the flat side of the element housing unit (EHU) on top of the element to boom brackets (Figure

17). The housing without the SO-239 coax connector is the director, the one with the SO-239 connec-

tor is the driven element (the balun is on the inside of this housing). The driven and reflector elements

should be positioned so the actual fiberglass element are the furthest away from each other (Figure 9).

Fasten each element housing to the element bracket, using eight 10-32 x 7/8” screws, flat washers, Ny-

lok nuts and tighten. The flat washer needs to be placed between the screw head and the plastic

element housing.

Warning: Tighten the element housing unit screws securely, but not too tight (if you over-tighten the

nut, you may split the plastic flange on the element housing).

The olive green element support tube (EST) on each antenna housing will appear uneven in length - it

is actually centered on the inside of the antenna housing .

Note: The reflector element and the driven element will have the EST (offset tube) lined up so that

the short side and long side of the each EST are facing in the same directions. The director

element EST configuration will be the opposite. This is normal.

Figure 19

Figure 17

SteppIR Antennas - 2 Element 10

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