| A
high gain, broad band antenna for 138-174 MHz, the 8-dipole DB228
combines two DB224E offset-pattern antennas to provide a 9 dB gain omni
or a 12 dB gain offset horizontal pattern. Both DB224E antennas are
mounted with the ends together, and the phasing harness is terminated at
the center. A special bracket positions the antenna at a predetermined
distance from the tower. Flexible Mounting - Normal mounting is half above and half below the top of the tower; however, the DB228 can be fully side mounted. Broad Bandwidth - Can provide symmetrical patterns for both transmit and receive, and can be used in single or multi-frequency systems. Offset or Circular Patterns - When all elements point toward the tower, a circular pattern is created; when all elements point away from the tower, an offset pattern occurs. The pattern can be changed in the field by rotating the mast 180 degrees. Lightning Resistant - The radiators operate at DC ground, and the aluminum mast with its pointed cap provides a low resistant discharge path to the tower or ground system. Ordering Information - Order DB228 for omni and DB228E for offset pattern. Use the correct letter for frequency, and specify termination if non-standard. Included are NSO18279-001 mounting bracket, one sway brace and adjustable clamps for 12" to 36" (304.8 to 914.4 mm) between tower legs. 12038 Sway Brace, needed when the entire antenna is side mounted, and Dipole Stabilizer Kit 12088 (8 required) are optional. Order jumper cable separately, if desired |
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