Directive Systems & Engineering DSE976LY Bedienungsanleitung

DSE976LY Rev 10/20

Directive Systems & Engineering

2702 Rodgers Terrace

Haymarket, VA 20169-1628

www.directivesystems.com

703-754-3876

9cm Loop Yagi, Model DSE976LY (w/sub-boom)

SPECIFICATIONS

Frequency range: 3.4 to 3.5 GHz Gain: ≅23dBi

Number of elements: 76 3 dB Beamwidth

Boom length: 96 inches (E plane): ≅11.6º

Boom diameter: 0.5” & 0.75” sub boom F/B ratio: >25 dB

Mast diameter: 2 inches max Maximum Power: 200 W average

Weight: (assembled) 3.5 pounds Stacking distance: 16 5/16 in. vertical

Connector: Type-N female 17 in. horizontal

Wind area: 0.65 sq. ft.

Note: All hardware is Stainless Steel unless otherwise noted.

BEFORE INSTALLING YOUR NEW ANTENNA, PLEASE BE SURE

TO READ THE ENCLOSED WARNING PAMPHLET.

ASSEMBLY INSTRUCTIONS

1) Unpack the antenna and locate the hardware package. Antennas are shipped in two

sections. In addition, a 48" long "sub-boom" is supplied (see drawing above.) The boom is

broken between directors 37 & 38. Remove D38, D39 and D40 from the front boom section

and slide the two boom pieces together. Use the alignment marks on the boom to correctly

connect the boom pieces. Align the elements. Replace D3839 & D40 Note that D38-40 are all

similar in size. Tighten the elements on the boom.

2) Straighten any misaligned elements and re-tighten if necessary. But do not touch R1,

DE or D1, as these have been factory set for minimum SWR.

P a g e | 2

DSE976LY Rev 10/20

3) Attach the two 3 x 4" sub boom plates to the angle brackets on the1/2” boom with the 8-

32 x 1/2”hardware provided. Install the sub-boom to the two plates with the two mast plate

mounting holes offset towards the rear (for mechanical balance). Use the 8-32 x 1 1/4"

machine screws. Install the mounting plate with the remaining 8-32 x 1 1/4” screws. Install the

1 1/2" U-bolt in the holes provided.

4) Attach the feed line and tape it to the bottom of the boom & sub-boom. The connector

should be sealed with silicone RTV or equivalent. On quad arrays it is possible to install the

power divider near the driven elements suspended from the short semi rigid phasing lines and

the hardline feeder.

5) The antenna SWR has been adjusted at the factory for less than 1.5:1 VSWR.

Additional tweaking can be accomplished by changing the shape of the driven element slightly

and by adjusting the distance between the driven element andR1 and D1. R1 is the reflector

closest to 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.

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