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.

P a g e | 2

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.

Straightenanymisalignedelementsandtightenhardwareifnecessary. But do not

touch R1, DE or D1, as these are factory set.

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.

P a g e | 3

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.

P a g e | 4

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.

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