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.

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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.