Directive Systems & Engineering DSE2045LY User manual

DSE2045LY Rev 4/21
Directive Systems & Engineering
2702 Rodgers Terrace
Haymarket, VA 20169-1628
www.directivesystems.com
703-754-3876
1537 MHz (INMARSAT) Loop Yagi, Model DSE2045LY
SPECIFICATIONS
Frequency Range: 1.52-1.56 GHz
Number of elements: 45
Boom Length: 120 inches
Boom diameter: .75 inch
Mast diameter: 1 1/2 inch maximum
Weight: 3 pounds
Connector: Type N female
Gain: ≅20.0 dBi
3 dB Beamwidth (E Plane): =16°
F/B Ratio: >20 dB
Maximum Power: 400 W. average
Stacking distance: 22 inches Vertical
24 inches Horizontal
PARTS
Note: All hardware is Stainless Steel unless otherwise noted.
1 Swivel Mount Assembly
2 1” Hose Clamp
1 1 ½” U-Bolt
1 Saddle
2 ¼-20 Hex Nuts
2 ¼” Lock Washer
1 Anti-Seize Compound
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.

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DSE2045LY Rev 4/21
ASSEMBLY INSTRUCTIONS
1) Unpack antenna and locate the hardware package. Antennas are shipped in three
sections, in which case the booms connect between directors 18 & 19, and 29 & 30. Remove
D 17 and D 18 from the rear boom section and slide the two pieces together. Alignthe
elements;replaceD17 andD18 andretighten.ProceedlikewisewithD27&28.
2) Straightenanymisalignedelementsandtightenhardwareifnecessary. But do not
touch R1, DE or D1, as these are factory set.
3) If the boom-to-mast "L" bracket isn’t already attached to the swivel bracket, do so now
with the hardware provided. (See diagram on opposite page. Polarization may be easily
adjusted by loosening the two hose clamps. Hydrogen line radiation is mostly randomly
polarized.)
(Can be up or down) (Can be left or right)
4) Attach the feed line and tape it to the bottom of the boom. The connector should be
sealed with electronic grade RTV or equivalent.
5) The antenna SWR has been adjusted for less than 1.5:1 at the factory. Additional
tweaking can be accomplished by adjusting the distance between the driven element and R1
and D1, or by slightly 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.

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DSE2045LY Rev 4/21
DSE2045LY Mounting
The2045LYloopyagi(1537MHz INMARSAT)isfittedwithaspecialadjustablepolarization
mount so that your antenna polarization can be adjusted for best results. The mounting center
fortheantennaisatDIRECTOR20.The2045LYisprovidedwithtwostainlesssteel hose clamps
that hold the boom to the Boom to Mast Bracket. The boom fits into a saddle on the bracket
and by loosening the clamps, the boom can be rotated nearly 90 degrees clockwise or counter
clockwise. In this manner, the polarization of the antenna can be set to match that of the
incoming signal for maximum gain. When max gain has beenrealized,tightenthetwohose
clampstopreventfurthermovement.
The mounting bracket allows elevation control when mounted on a horizontal support
mastofupto11/2inchesindiameter.Seediagrambelow.

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DSE2045LY Rev 4/21
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.