Directive Systems & Engineering DSE3311LYRM User manual

DSE3311LYRM Rev 3/21
Directive Systems & Engineering
2702 Rodgers Terrace
Haymarket, VA 20169-1628
www.directivesystems.com
703-754-3876
33cm Loop Yagi (Rear Mount), Model DSE3311LYRM
SPECIFICATIONS
Frequency range: 902-928 MHz Gain: 14.5 dBi
Number of elements: 11 3 dB Beamwidth
Boom length: 36 inches (E plane): =34º
Boom diameter: 1 inch F/B ratio: >20 dB
Mast diameter: 1 1/2 inches max Maximum Power: 550 W average
Weight: (assembled) 2 pounds Stacking distance: 17 inches’ vertical
Connector: Type-N female 19 inches’ horizontal
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) Carefully remove the antenna from shipping container and locate the hardware package.
2) Straighten any misaligned elements and tighten hardware if necessary. But do not
touch R1, DE or D1, as these have been factory set for minimum SWR.
3) Insert the U-bolt in the Rear-Mount Bracket. The Bracket can be oriented for horizontal
or vertical polarization. (See figures below.) There are two sets of mounting holes in the rear
boom.

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DSE3311LYRM Rev 3/21
(Can be up or down) (Can be left or right)
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. Additional
tweaking can be accomplished by adjusting the distance between the driven element and R1
and D1, or by adjusting the shape of the driven element. NOTE: Do not attempt this
adjustment unless the proper equipment and qualified personnel are available.
6) If antennas are to be stacked, see "Instructions for Stacking Loop Yagis".
DO NOT, UNDER ANY CIRCUMSTANCES, APPLY ANY TYPE OF SEALANT OR COATING TO THE
DRIVEN ELEMENT, T-ARMS OR CONNECTOR ASSEMBLY, OTHER THAN KRYLON®
CLEAR COAT. ANY OTHER COATING WILL ADVERSELY AFFECT THE SWR AND VOID YOUR
WARRANTY.
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.