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DSE945LYRM Rev 10/20

Directive Systems & Engineering

2702 Rodgers Terrace

Haymarket, VA 20169-1628

www.directivesystems.com

703-754-3876

9cm Loop Yagi (Rear Mount), Model DSE945LYRM

SPECIFICATIONS

Frequency range: 3.40 to 3.48 GHz Gain: 20 dBi

Number of elements: 45 3 dB Beamwidth

Boom length: 60 inches (E plane): 16º

Boom diameter: 0.5 inches F/B ratio: >20 dB

Mast diameter: 1 1/2 inches max Maximum Power: 100 W average

Weight: (assembled) 1.5 pounds Stacking distance: 9 inches’ vertical

Connector: Type-N female 9.8 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. Assemble the boom by removing the last three directors from the rear (longer) boom

piece. These loops are D22, 23 &24, and are of similar size. Insert front boom piece into rear

boom piece so that the orientation lines are aligned. Now insert D22 thru 24 into their

respective mounting holes and tighten.

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.

3) Attach the boom to mast plate to the boom with the hardware provided. Install the U-bolts

so that the mast comes up directly under the boom.

4) Attach the feed line, and tape it to the bottom of the boom. 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 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.

P a g e | 2

DSE945LYRM Rev 10/20

6) If antennas are to be stacked, see "Instructions for Stacking Loop Yagis".

Observe the drawing below to assemble the antenna to your mast. Install coax and

weatherproof your connection with RTV or equivalent. Tape coax to mast.

DSE945LY BOOM TO MAST MOUNT AND CONNECTOR DETAIL

FOR BEST RESULTS, ORIENT ANTENNA AS SHOWN WITH ELEMENTS LOCATED

BELOW THE BOOM TO PREVENT DAMAGE FROM OVERWEIGHT BIRDS!

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.