Directive Systems & Engineering DSEH12-27 User manual

DSEH12-27 Rev 4/21
Directive Systems & Engineering
2702 Rodgers Terrace
Haymarket, VA 20169-1628
www.directivesystems.com
703-754-3876
2200-2500 MHz Circular Polarized Antenna, Model DSEH12-27
SPECIFICATIONS
Frequency range: 2200 to 2500 MHz Gain: 18.1 dBic
Polarization : RHCP (Circular) STD. 3 dB Beamwidth
Number of turns: 27 (Circular): 20º
Helix length: 34 inches F/B ratio: ≥16 dB
Mast diameter: 2 in. max Maximum Power: 100 W average
Weight: 5 pounds
Connector: Type-N female
Note: All hardware is Stainless Steel unless otherwise noted.
Anti-Seize Compound - Apply a small amount of the supplied Anti-Seize Compound to the aluminum
joints and to the threads of the U-Bolts to prevent galling.
BEFORE INSTALLING YOUR NEW ANTENNA, PLEASE BE SURE
TO READ THE ENCLOSED WARNING PAMPHLET.
ASSEMBLY INSTRUCTIONS
1) Unpack antenna and locate the U-bolt /Hardware package.
2) Install the U-bolts (2) on the 8" x 8" back mounting plate using the saddles, 5/16" hex-
nuts and split washers provided. (See drawing above.)
3) Attach the antenna to your support mast. The antenna is Right hand circular, and does
not require any specific orientation for maximum reception other than to point it in the correct

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DSEH12-27 Rev 4/21
direction. Tighten the U-bolts to your mast, using the 5/16” hardware supplied. Take care not
to crush your support mast.
4) Attach the feed line, and tape it to the mast. The connector should be sealed with
electronic grade RTV or equivalent.
5) The antenna SWR has been adjusted at the factory for less than 1.5:1. There are no
adjustments to be made to the antenna. Maximum radiation is in the direction of the long axis
of the antenna and away from the rear plate.
Directive Systems Warranty Policy
All Directive Systems antennas are built with the finest materials available. 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 will repair 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 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.