Directive Systems & Engineering DSE9112LY User manual

DSE9112LY Rev 10/20

Directive Systems & Engineering

2702 Rodgers Terrace

Haymarket, VA 20169-1628

www.directivesystems.com

703-754-3876

9cm Loop Yagi, Model DSE9112LY (w/sub-boom)

SPECIFICATIONS

Frequency range: 3.40 to 3.50 GHz Gain: ≅25.2dBi

Number of elements: 112 3 dB Beamwidth

Boom length: 144 inches (E plane): ≅8.7º

Boom diameter: 0.5 inch (H plane): ≅9.0º

Mast diameter: 2 inches max F/B ratio: >25 dB

Weight: (assembled) 4.62 pounds Maximum Power: 300 W average

Connector: Type-N female Stacking distance: 21 inches’ vertical

Wind area: 1.0 sq. ft. 22 inches’ horizontal

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 "sub-boom" is supplied (see drawing above.) The boom is broken

between directors 55&56. Remove D56, D57 and D58 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 D56,57& D58 Note that D56-58 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

DSE9112LY Rev 10/20

3) Attach the 2.4” angle brackets and sub boom plates (2) with 8-32 hardware. Use 1" screws

to attach the angle brackets to the 1/2" boom and 1/2”" screws for the sub-boom plates to the

angle brackets. The mounting centers are D-30 & 81. Attach the 3/4" square sub-boom to the two

3 X 4" brackets using 8-32 x 1 1/4" hardware. Align the center mounting holes on the sub boom

toward the rear of the antenna so that the holes are at the antenna balance point. Install the 3 1/2

x 4" bracket and U bolt at the balance point of the antenna. Use 8-32 x 1 1/4" hardware. The

antenna will appear slightly front heavy with no coax attached to the feed.

4) Attach the feed line and tape it to the sub-boom. The connector should be sealed with

silicone RTV or equivalent.

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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