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.