Directive Systems & Engineering DSEFO146-12 Manuale utente

DSEFO146-12 Rev 10/20

Directive Systems & Engineering

2702 Rodgers Terrace

Haymarket, VA 20169-1628

www.directivesystems.com

703-754-3876

12 Element 2.5 wl. K1FO Designed Yagi, Model DSEFO146-12

ELECTRICAL SPECIFICATIONS

Frequency range: MHz ......................145-148

Gain: dBd........................................... 12.6

Impedance: Ohms.............................. 50

Connector type................................... Type N(F) UG-58/U

Front -to- back ratio: dB...................... 23

SWR: Typical at resonance................ ≅1.2:1

Beamwidth: degrees

E- Plane ................................. 34°

H- Plane ................................. 37°

Sidelobe level: decibels

E- Plane ................................. -19

H- Plane ................................. -16

Power rating, Continuous: Watts ....... 1000

Stacking Distance: ft.(m)

E- Plane.................................. 11’7” (3.53)

H- Plane.................................. 10’8” (3.25)

MECHANICAL SPECIFICATIONS

Boom length: ft. (m.)........................... 17’4” (5.28)

Turning radius: in. (m.)........................ 10’4” (3.15)

Weight Assembled: Lbs (kg.).............. 9.5 (4.32)

Max mast size: in. (cm.)....................... 2”(5.08)

Wind surface area: Ft (m. ) ................. 1.5 (.14)

Wind Survival: Mph (km/hr)................. 100 (160)

PARTS LIST

Note: All hardware is Stainless Steel, unless otherwise noted.

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DSEFO146-12 Rev 10/20

Anti-Seize Compound - Apply a small amount of the supplied Anti-Seize Compound to the aluminum joints and

to the threads of the U-Bolts to prevent galling.

BEFORE INSTALLING YOUR NEW ANTENNA, PLEASE BE SURE

TO READ THE ENCLOSED WARNING PAMPHLET.

CAUTION: While we strive to remove all burrs from all machined parts, there is always the

possibility of sharp edges. We strongly suggest checking the edges and use a fine file,

or 400 grit sandpaper, to remove any burrs that may have been left.

Tools needed: #2 Phillips screwdriver

¼” flat blade screwdriver

large needle nosed pliers

keeper installation tool (supplied with kit)

ruler with metric millimeter markings

marking pencil

Hardware Ba g Boom-to-Mast Hardware

T-arm Shorting Ba rs 2 1/4" x 1 3/4" U-bol ts 2

8-32 x 1 1/4" Machi ne s crew 4 1/4" Nuts 4

8-32 x 1 3/4" Machi ne s crew 3 1/4" Spl i t Lock washers 4

#8 Internal Tooth Lock was hers 2 1/4" Flat was hers 4

#8 Split Lock was hers 6 5/16" x 2" U-bolts 2

#8 Nuts 8 5/16" Nuts 4

6-32 x 1/2" Machi ne screw 2 5/16" Spl i t Lock was hers 4

#6 Internal Tooth Lock was her 5 5/16" Fl a t wa s hers 4

T-arm s upport bracket (pre- 1

ass embled with Del rin standoffs)

1/4" Element i ns ul a tors 23 Prepa red Ba l un 1

1/4" Keepers 24 Boom to Mas t pl a te 1

3/8" Hol e pl ug 1 Anti -Sieze Compound 1

1/2" End ca ps 2 Element as s embly tool 1

3/8" End caps 2

1 1/4" Boom End Caps 2 Ass embly Manua l 1

1 1/2" Hos e Cla mps 2

Prepa red Fema l e Type-N connector 1

Cabl e ties 3

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DSEFO146-12 Rev 10/20

ASSEMBLY INSTRUCTIONS

1) The antenna components should be removed carefully from the shipping container and

the individual parts counted and checked for completeness. Be careful to check all tubing

pieces for elements and hardware that may be packed inside.

In the following steps, apply a small amount of the supplied Anti-Seize to the boom joints:

2) The boom consists of three pieces of tubing. The rear boom section has the large hole

for the driven element in it. The larger diameter center boom section (1 3/8" dia.) must be

connected to the rear section. Insert rear section where marked with like colors, align the #8

hardware mounting holes and slide the stainless steel worm clamp over the slotted portion of

the center boom piece. An 8-32 X1 3/4" machine screw, lock washer and hex nut complete the

process. Tighten all hardware then proceed with the front boom piece. That connection with

the mid boom piece is also marked with like colors. Similarly attach the front boom section as

you did the rear.

3) The element bundle contains all of the elements needed for assembly. Take time to

inventory each one and check off each dimension with Table 1. Some elements vary by 1 or

2mm in overall length, so extreme care in measuring is called for here. Arrange elements in

order of descending size and mark each element with a scribe for proper location of the

“keeper”(See Table 1 and Figure 1). The reflector is the longest element, and each

succeeding director is slightly shorter. DIR # 10 is the shortest. The keeper must be installed

as shown in Fig. 2. Using the aluminum tubing tool supplied, slide the keeper to within 1/8”or

3mm of the scribed line. Final adjustment will be done on the antenna. Note that the keeper is

a one-way device only. If you go past the scribed line, you must continue to the element end

and start the process over. Place the first keeper on all elements.

See pictures below for keeper orientation. The front side, with the tabs going inward, is the

side to push onto the element. The rear side, with the tabs going outward, is the side that

faces you. It is the side that goes face down into the element tool.

Keeper Front side Keeper Rear side

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DSEFO146-12 Rev 10/20

4) You are now ready to install the elements on the boom. You must start at one end and

work your way, in order, to the far end of the boom. Lay out the elements in ascending or

descending order as appropriate. Install a black insulator in each side of the boom piece at

the starting end, and slide the correct element through the two insulators. Obtain a second

keeper and install that keeper on the opposite end of element #1 from the pre-installed keeper.

(See Figure 3) Check that the element is centered before you snug up both keepers. A

positioning error of +/- 2mm or 0.080" is acceptable.

5) At this point, if you tighten the keepers and the element is not centered, you will have to

cut one of the keepers to remove the element and start again. Some extra keepers are

supplied, but care is definitely required here. Check your work as you go! Proceed with the

next element in similar fashion. Check off each element on Table 1 to monitor your progress.

Double-check element lengths one last time before final installation on the boom.

6) The driven element is next. Refer to the drawing in Figure 4 and the photos in Figure 5

for guidance. The driven element slides through the boom at the ½” holes. It should slide

through with some friction and you might need to twist it back and forth to get it through. Align

the hole in the driven element with the hole in the boom. Insert an 8-32 X 1 ¾” screw through

the large hole in the bottom of the boom, through the driven element and up through the hole

in the boom. Place the T-arm support bracket on next, then the connector L bracket

(connector facing forward!). Next place a #8 internal tooth lock washer and a nut and tighten.

Install 3/8” plastic plug in the driven element access hole.

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DSEFO146-12 Rev 10/20

FIGURE 4.

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DSEFO146-12 Rev 10/20

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DSEFO146-12 Rev 10/20

FIGURES 5.

If you are installing multiple antennas, please be sure that you build each

antenna with the same T-match wire orientation. In the above drawing, the center pin

goes to the right hand side of the antenna as viewed from the back of the connector.

Make sure both antennas do the same! Proper phase relationship is very important

here!

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DSEFO146-12 Rev 10/20

7) Next is the T-Match assembly. Once again, refer to figure 4 and 5. Starting with the left

T-arm, viewed from the rear, pass a 6-32 X ½” screw through a #6 internal tooth lock washer

and through a lug on the center conductor of the balun through a second # 6 internal tooth

lock washer, through the T-arm and into the insulator. Do not over-tighten the screw as the

threads of the insulator can be easily damaged. The right side is next. Pass a 6-32 X ½” screw

through a #6 internal tooth lock washer, then the center conductor of the balun, another #6

internal tooth lock washer, the lug from the N connector, another #6 internal tooth lock washer,

the T-arm and screw into the insulator.

8) Place a #8 internal tooth lock washer on the screw securing the driven element and the

T-arm support bracket, then the two ground lugs from the balun, then another #8 internal tooth

lock washer and nut. Tighten securely.

9) Last, pass 8-32 X 1 ¼” screws through the holes in the shorting bars and place a split

lock washer and nut on the other end. Slide the shorting bars over the ends of the driven

elements and over the T arms and measure from the boom to the inside edge of the shorting

bars and set the length. The following shows various shorting bar settings and the resultant

SWR plots:

160mm

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DSEFO146-12 Rev 10/20

170mm

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DSEFO146-12 Rev 10/20

180mm

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