Directive Systems & Engineering DSE1276LY Manuale utente

DSE1276LY Rev 3/21

Directive Systems & Engineering

2702 Rodgers Terrace

Haymarket, VA 20169-1628

www.directivesystems.com

703-754-3876

12cm Loop Yagi Kit, Model DSE1276LY (w/sub-boom)

SPECIFICATIONS

Frequency range: 2.35 to 2.48 GHz Gain: ≅23.4 dBi

Number of elements: 76 3 dB Beamwidth

Boom length: 144 inches (E plane): ≅10.7º

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

Mast diameter: 1 1/2 in. max Maximum Power: 400 W average

Weight: (assembled) 5.2 pounds Stacking distance: 24.5 in. vertical

Connector: Type-N female 25.25 in. horizontal

Note: All hardware is Stainless Steel unless otherwise noted.

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.

ASSEMBLY INSTRUCTIONS

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

two sections, in which case the boom is broken between directors 37 & 38. Remove D37 and

D38 from the rear boom section and slide the two boom pieces together. Align the elements.

Replace D37 & D38 and retighten.

2) Straighten any misaligned elements and tighten hardware if necessary. But do not touch

R1, DE or D1, as these have been factory set for minimum SWR.

3) Install the U-bolt into the boom to mast bracket so that the mast comes up directly

under the boom. Note that the bracket can be installed for either vertical or horizontal polarization.

(See drawings below)

P a g e | 2

DSE1276LY Rev 3/21

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

4) Attach the feed line, and tape it to the mast. The connector should be sealed with electronic

grade RTV or equivalent.

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

tweaking can be accomplished by adjusting the distance between the driven element and R1

and D1, or by 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".

Refer to photo and the next few steps for clarification on the Sub Boom:

7) Mount the boom to mast bracket (square tubing piece) to the center boom section,

using 8-32 X 2" screws, lock washers and nuts. Mount the boom to mast plate to this bracket

using 8-32 x 1 ¼” screws, lock washers and nuts. Note: There may be extra holes in the plate that

may be used for different applications.

8) There are two sub-boom brackets consisting of ½” aluminum angle and sub-boom

plates. Mount the angle brackets on the front and rear boom sections using 8-32 x 1 3/8”

screws, lock washers and nuts. Mount the sub-boom plates to these brackets using 8-32 x ½”

screws, lock washers and nuts.

Sub Boom Bracket

Sub Boom

Plate

Sub Boom

P a g e | 3

DSE1276LY Rev 3/21

9) Mount the sub-boom (3/4” thick wall aluminum square tubing) to the sub-boom brackets

and boom to mast plate using 8-32 x 1 ¼” screws, lock washers and nuts. NOTE: Do not

tighten any of this hardware until sub-boom assembly is complete.

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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