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DSEFO144-12 Rev 8/19 

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. 
 
 
 

 

 
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. 

Содержание DSEFO144-12

Страница 1: ...nt 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...

Страница 2: ...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 Phillip...

Страница 3: ...ements 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 Ar...

Страница 4: ...ngths 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 bo...

Страница 5: ...P a g e 5 DSEFO144 12 Rev 8 19 FIGURE 4...

Страница 6: ...P a g e 6 DSEFO144 12 Rev 8 19...

Страница 7: ...ase 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 M...

Страница 8: ...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 interna...

Страница 9: ...e adjust the shorting bars for minimum SWR Always keep the shorting bars th same distance from the ends of the driven element Generally good wattmeters can reliably indicate SWR down to about 1 2 1 A...

Страница 10: ...e We take great pride in building a quality product that will give years of good service and performance If there is a defect in materials or workmanship within 90 days of purchase Directive Systems w...

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