Directive Systems & Engineering DSE1245LY User manual

DSE1245LY Rev 3/21
Directive Systems & Engineering
2702 Rodgers Terrace
Haymarket, VA 20169-1628
www.directivesystems.com
703-754-3876
12cm Loop Yagi, Model DSE1245LY
SPECIFICATIONS
Frequency Range: 2.35 to 2.45 GHz
Number of elements: 45
Boom Length: 81 inches
Boom diameter: 0.5 inch
Mast diameter: 1 ½ inch max.
Weight: 3 pounds
Connector: Type N female
Gain: ≅20 dBi
3 dB Beamwidth (E Plane): ≅16°
F/B ratio: ≥20 dB
Maximum Power: 400 W. average
Stacking distance: 13 inches’ vertical
15 inches’ 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.
2) Antenna may be shipped in two sections; if so, the splice will be between directors 25 &
26. Remove D24 and D25 from the rear boom section and slide the two boom pieces together.
Align the reference marks on the boom, replace D24 & D25 and retighten.
3) 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.

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DSE1245LY Rev 3/21
4) 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)
(Can be up or down) (Can be left or right)
5) Attach the feed line, and tape it to the mast. The connector should be sealed with electronic
grade RTV or equivalent.
6) 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.
7) 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.