Directive Systems & Engineering DSE3347LYA Manuale utente

DSE3347LYA Rev 4/21

Directive Systems & Engineering

2702 Rodgers Terrace

Haymarket, VA 20169-1628

www.directivesystems.com

703-754-3876

33cm Loop Yagi, Model DSE3347LYA (w/sub-boom)

SPECIFICATIONS

Frequency range: 910-930 MHz Gain: 20.5 dBi

Number of elements: 47 3 dB Beamwidth

Boom length: 216 inches (E plane): 14.4º

Boom diameter: 1 inch F/B ratio: >20 dB

Mast diameter: 2 inch max Maximum Power: 550 W average

Weight: (assembled) 13 pounds Stacking distance: 38 inches’vertical

Connector: Type N female 41 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 antenna and locate the two preassembled antenna sections and the hardware

package. The antenna is shipped in three boom sections. There are alignment marks to assure

proper assembly. The mid boom has a long rectangular bracket attached. This is the midpoint of

the antenna at D21. The front and rear sections have shorter 3-3/4" brackets attached at D13 &

D33. Assemble the three sections together so that the alignment marks match. You will have to

remove D17 & D31 and insert the boom sections into one another, then reinstall the two loops and

retighten the 4-40 hardware. A1/4" nut driver is required for this.

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) 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. Note that the bracket can be installed for

either vertical or horizontal polarization. (See drawings below)

P a g e | 2

DSE3347LYA Rev 4/21

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

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) As shipped, the antenna SWR will be 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 photos in 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.

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.

P a g e | 3

DSE3347LYA Rev 4/21

Boom to Mast Bracket

Boom to Mast Plate

Sub Boom

Sub Boom Plate

Sub Boom

Bracket

P a g e | 4

DSE3347LYA Rev 4/21

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.

R RETURN.

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