Directive Systems & Engineering DSEFO222-22 Manual Download Page 7

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DSEFO222-22 Rev 2/21 

 

Photo 5 

 

14) 

Slide the T-arm shorting bars over the driven element and T-arms. Measuring from the 

boom to the inside of the shorting bar, the dimension below is a good starting point; however, 
to ensure the minimum SWR at your operating frequency, we recommend using an antenna 
analyzer or SWR bridge to obtain the lowest SWR. Note: The ends of the T-arms that extend 
past the shorting bars can be bent up toward the driven element, or down away from the 
driven element to obtain the best SWR. 
 

 

 

 
 
 
 

Summary of Contents for DSEFO222-22

Page 1: ...Impedance Ohms 50 Connector type Type N F Front to back ratio dB 22 SWR Typical at resonance 1 12 1 Beamwidth 3dB degrees E Plane 23 H Plane 24 Sidelobe level decibels 1st E Plane 17 5 1st H Plane 15...

Page 2: ...ed 2 Long tangent U bolt 1 1 3 8 OD x 0 058 x 72 rear mid Black Red 1 2 Saddle 1 1 1 2 OD x 0 058 x 72 center Red Blue 1 Aluminum spacer 2 1 3 8 OD x 0 058 x 71 1 2 front mid Blue Green 1 10 32 Machin...

Page 3: ...of extras just in case 4 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 i...

Page 4: ...rs 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 Note that the d...

Page 5: ...in photo 2 Photo 2 10 Once the T arm is inserted all the way as in photo 2 slightly loosen the screw holding the insulator using a 1 Phillips screw driver 11 Rotate the T arm so the end of the T arm f...

Page 6: ...ev 2 21 Photo 3 12 Next insert the straight T arm into the other standoff insulator until it is flush with the inside edge see photo 4 Photo 4 13 Last wrap the balun center conductor around the T arms...

Page 7: ...ing bar the dimension below is a good starting point however to ensure the minimum SWR at your operating frequency we recommend using an antenna analyzer or SWR bridge to obtain the lowest SWR Note Th...

Page 8: ...each leg of the long tangent U bolt you just installed and place the flattened end of one of the boom sag struts on each leg followed by another flat washer and a nylon lock nut DO NOT TIGHTEN THE NUT...

Page 9: ...out 8 feet or 2 5 m above the ground Point the antenna so that there are no reflectors or obstructions for 100 feet directly in front of the beam A better method would be to point the antenna straight...

Page 10: ...ss steel threads under the hex nuts to prevent galling of stainless steel This will complete the assembly of your DSEFO222 22 The construction of this antenna will provide many years of consistent per...

Page 11: ...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...

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