Directive Systems & Engineering DSE1445LY User manual

DSE1445LY Rev 4/21

Directive Systems & Engineering

2702 Rodgers Terrace

Haymarket, VA 20169-1628

www.directivesystems.com

703-754-3876

1850-2000 MHz Loop Yagi, Model DSE1445LY

SPECIFICATIONS

Frequency Range: 1.85-2.00 GHz (any 25 MHz segment)

Number of elements: 45

Boom Length: 90 inches

Boom diameter: 0.625 inch

Mast diameter: 1 1/2 inch

Weight (Shipping) 3 pounds

Connector: Type N female

Gain: ≅20.0 dBi

3 dB Beamwidth (E Plane): ≅16 degrees

F/B Ratio: ≥ 20 dB

Maximum Power: 400 Watts average

Stacking distance: 15 inches Vertical (H)

17 inches Horizontal (E)

Note: All hardware is Stainless Steel unless otherwise noted.

BEFORE INSTALLING YOUR NEW ANTENNA, PLEASE BE SURE

TO READ THE ENCLOSED WARNING PAMPHLET.

CAUTION: While we strive to remove all burrs from all machined parts, there is always the

possibility of sharp edges. We strongly suggest checking the edges and use a fine file,

or 400 grit sandpaper, to remove any burrs that may have been left.

ASSEMBLY INSTRUCTIONS

1) Unpack antenna and locate the hardware package. Some antennas are shipped in

two sections, in which case the boom is broken between directors 21and22. Remove D21

and D22 from the rear boom section, slide the boom pieces

together, replace the D21 and

D22 elements, align and retighten. Note the boom markings for correct assembly order.

2) Straightenanymisalignedelementsandtightenhardwareifnecessary. But do not

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

P a g e | 2

DSE1445LY Rev 4/21

(Can be up or down) (Can be left or right)

3) Attach the boom to mast “L” bracket to the boom with the 8-32 x 1” screws, lock

washers and nuts and the plate to the bracket with the 8-32 x 1/2” screws, lock washers and

nuts provided. Install the U-bolt so that the mast comes up directly under the boom.

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

R1andD1,orbyslightlyadjustingtheshapeofthedrivenelement. NOTE: Do not attempt this

adjustment unless the proper equipment and qualified personnel are available.

6) Ifantennasaretobestacked,see"InstructionsforStackingLoop 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.

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