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DSEFO146-12 Rev 10/20
Directive Systems & Engineering
Haymarket, VA 20169-1628
12 Element 2.5 wl. K1FO Designed Yagi, Model DSEFO146-12
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
Sidelobe level: decibels
Power rating, Continuous: Watts ....... 1000
Stacking Distance: ft.(m)
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)
Note: All hardware is Stainless Steel, unless otherwise noted.
2702 Rodgers Terrace
www.directivesystems.com
703-754-3876
ELECTRICAL SPECIFICATIONS
E- Plane ................................. 34°
H- Plane ................................. 37°
E- Plane ................................. -19
H- Plane ................................. -16
E- Plane.................................. 11'7" (3.53)
H- Plane.................................. 10'8" (3.25)
PARTS LIST
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Summary of Contents for Directive Systems & Engineering DSEFO146-12
- Page 1 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....
- Page 2 400 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 DSEFO146-12 Rev 10/20...
- Page 3 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 DSEFO146-12 Rev 10/20...
- Page 4 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. DSEFO146-12 Rev 10/20...
- Page 5 P a g e FIGURE 4. DSEFO146-12 Rev 10/20...
- Page 6 P a g e DSEFO146-12 Rev 10/20...
- Page 7 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! DSEFO146-12 Rev 10/20...
- Page 8 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 DSEFO146-12 Rev 10/20...
- Page 9 P a g e 170mm DSEFO146-12 Rev 10/20...
- Page 10 P a g e | 10 180mm DSEFO146-12 Rev 10/20...
- Page 11 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. DSEFO146-12 Rev 10/20...
- Page 12 RTV over the tape. This will provide a good vapor barrier and ensure years of trouble free performance. The insulated design will make for a very long-lived antenna that will stand up well in harsh environments. DSEFO146-12 Rev 10/20...
- Page 13 CLEAR COAT. ANY OTHER COATING WILL ADVERSELY AFFECT THE SWR AND VOID YOUR WARRANTY. This will complete the assembly of your DSEFO146-12. The construction of this antenna will provide many years of consistent performance with no degradation of performance due to corrosion and weathering.
- Page 14 ANY ANTENNA THAT HAS BEEN MODIFIED WILL BE SUBJECT TO A RESTOCKING CHARGE. IF AN ANTENNA IS SO MODIFIED AS TO MAKE IT UNUSABLE, DIRECTIVE SYSTEMS RESERVES THE RIGHT TO REFUSE TO ACCEPT THE ANTENNA FOR RETURN. DSEFO146-12 Rev 10/20...
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