Directive Systems & Engineering DSEFO146-12, Manual

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Directive Systems & Engineering DSEFO146-12 Manual Download Page 1

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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Summary of Contents for DSEFO146-12

Page 1: ...ront 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 ...

Page 2: ...lation tool supplied with kit ruler with metric millimeter markings marking pencil Hardware Bag Boom to Mast Hardware T arm Shorting Bars 2 1 4 x 1 3 4 U bolts 2 8 32 x 1 1 4 Machine screw 4 1 4 Nuts 4 8 32 x 1 3 4 Machine screw 3 1 4 Split Lock washers 4 8 Internal Tooth Lock washers 2 1 4 Flat washers 4 8 Split Lock washers 6 5 16 x 2 U bolts 2 8 Nuts 8 5 16 Nuts 4 6 32 x 1 2 Machine screw 2 5 1...

Page 3: ...he 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 Se...

Page 4: ...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 ele...

Page 5: ...P a g e 5 DSEFO146 12 Rev 10 20 FIGURE 4 ...

Page 6: ...P a g e 6 DSEFO146 12 Rev 10 20 ...

Page 7: ...lease 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 ...

Page 8: ...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 screws ...

Page 9: ...P a g e 9 DSEFO146 12 Rev 10 20 170mm ...

Page 10: ...P a g e 10 DSEFO146 12 Rev 10 20 180mm ...

Page 11: ...gth off the ground The SWR will get better the higher you put the antenna 10 Using the supplied cable ties secure the balun to the boom exactly as shown in Figure 6 and route so they do not touch any of the elements this will ensure minimum SWR Install supplied 1 1 8 plastic caps on ends of boom ...

Page 12: ... plates are at the same location When attaching the antenna to your mast use the 5 16 U Bolts flat washers lock washers and nuts Once you have the U bolts installed and the antenna mounted on your support mast and tightened you can route your feedline along the mast and over to the driven element and connector Dress the coax against the antenna boom and tighten the connector Seal the connector bod...

Page 13: ... coax 1 2 wave is ideal The antenna impedance will repeat each half wave from the antenna regardless of coax imperfections between the coax connector and your bridge or wattmeter If you utilize your 144 MHz transmitter as an RF source apply power observe the reflected power Turn off the power and adjust the T Match bars equally in small increments 1 8 or 3 mm is a good starting point Apply power a...

Page 14: ...r or replace the defective part free of charge to the original purchaser DO NOT RETURN ANYTHING WITHOUT PRIOR AUTHORIZATION FROM DIRECTIVE SYSTEMS Please contact us either by phone or email describing the problem and we will work to resolve it If after examining a new antenna you received you are not satisfied contact us immediately for return authorization and refund ANY ANTENNA THAT HAS BEEN MOD...

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