DX Engineering DXE-BCSO-3-075 User manual

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Bead Choke Standoff Kits
For Yagi Antennas
DXE-BCSO-3-075
DXE-BCSO-3-100
DXE-BCSO-2-075
DXE-BCSO-2-100
DXE-BCSO-INS Revision 0a
© DX Engineering 2020
1200 Southeast Ave. - Tallmadge, OH 44278 USA
Phone: [phone] ∙Tech Support and International: [phone]
Fax: [phone] ∙ E-mail: [email protected]

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Introduction
DX Engineering Bead Choke Standoff Kits bring a
practical solution to a serious problem with the use of
ferrites on coaxial cable at the feedpoint of beam
antennas. A limited number of Amateur Radio operators
and antenna engineers have known for years about the
superior choking function of many ferrite toroids beads
placed on the coaxial cable, as compared to standard
feedpoint baluns. A more recent revelation is that the
proximity of those beads and coax to the aluminum
boom of the antenna was drastically reducing their
effectiveness.
DX Engineering Bead Choke Standoff Kits hold an RF
bead choke and the incorporated feedline 4 inches away
from the metal beam antenna boom (or 4 inches away
from the metal mast for a dipole). They maintain the
optimal choking performance of ferrite beads on coax. Using DX Engineering Bead Choke Standoff Kits,
fully effective ferrite bead chokes function at peak performance for these key results:
Prevent feedline radiation of RF
Preserve current balance for proper beam antenna pattern
Prevent feedline shield exterior collected noise and signals from entering the antenna and
interior of the feedline, resulting in lower noise floor and enhanced reception
When installing a Beaded Choke on a typical Yagi antenna it is necessary to ensure that the ferrite beads
used are kept in-line and away from the boom.
The boom of the antenna will effect the proper operation of the bead style choke if it is located very near or
right next to the boom.
The DX Engineering Beaded Choke Standoff kits provide a sturdy guide for the choke and allow the beaded
choke to be away from the boom for maximum performance.
Kits Available
There are four Beaded Choke Standoff kits available. Each kit has three assemblies.
Part Number
Description
DXE-BCSO-2-075
Standoff Kit for 2 inch boom and ferrite beads 0.75” OD
DXE-BCSO-2-100
Standoff Kit for 2 inch boom and ferrite beads 1” OD
DXE-BCSO-3-075
Standoff Kit for 3 inch boom and ferrite beads 0.75” OD
DXE-BCSO-3-100
Standoff Kit for 3 inch boom and ferrite beads 1” OD
Includes three drilled and threaded 4” Insulated Standoffs (color may vary)
Includes three DX Engineering stainless steel ECLS Boom Clamps with welded, threaded studs
(2” or 3” depending on kit ordered)
Includes three custom cut PVC Guides with stainless steel hardware

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Manual Updates
Every effort is made to supply the latest manual revision with each product. Occasionally a manual
will be updated between the time your DX Engineering product is shipped and when you receive it.
Please check the DX Engineering web site (www.DXEngineering.com) for the latest revision
manual.
Tools Required
5/16” Nut Driver
Assembly
The size of the Boom Clamps and the size of the PVC Guides depend on the model Standoff Kit.
Attach one Boom Clamp to each of the Insulated Standoffs (color may vary) by threading them on
completely.
Using a 5/16” Nut Driver, attach a PVC Guide to the other end of the insulated standoff with the
Hex Head Bolt, Split Washer and Flat Washer as show. Align the PVC Guide in the same direction
as the Boom Clamp.
Depending on the length of the Beaded Choke being used, space the three completed guides on the
antenna boom in place by opening the boom clamps, place them around the boom, then close and
tighten the boom clamps in place. The Beaded Choke can then be routed through the Standoffs.

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Once in place, it is suggested that you wrap the beaded choke in place using 3M Super 88 Vinyl
Tape (TES-06143) as shown in the example below.
Technical Support
If you have questions about this product, or if you experience difficulties during the installation,
contact DX Engineering at [phone].
You can also e-mail us at: [email protected]
Warranty
All products manufactured by DX Engineering are warranted to be free from defects in material and workmanship for a period of one
(1) year from date of shipment. DX Engineering’s sole obligation under these warranties shall be to issue credit, repair or replace any
item or part thereof which is proved to be other than as warranted; no allowance shall be made for any labor charges of Buyer for
replacement of parts, adjustment or repairs, or any other work, unless such charges are authorized in advance by DX Engineering. If
DX Engineering’s products are claimed to be defective in material or workmanship, DX Engineering shall, upon prompt notice
thereof, issue shipping instructions for return to DX Engineering (transportation-charges prepaid by Buyer). Every such claim for
breach of these warranties shall be deemed to be waived by Buyer unless made in writing. The above warranties shall not extend to
any products or parts thereof which have been subjected to any misuse or neglect, damaged by accident, rendered defective by reason
of improper installation, damaged from severe weather including floods, or abnormal environmental conditions such as prolonged
exposure to corrosives or power surges, or by the performance of repairs or alterations outside of our plant, and shall not apply to any
goods or parts thereof furnished by Buyer or acquired from others at Buyer’s specifications. In addition, DX Engineering’s warranties
do not extend to other equipment and parts manufactured by others except to the extent of the original manufacturer’s warranty to
DX Engineering. The obligations under the foregoing warranties are limited to the precise terms thereof. These warranties provide
exclusive remedies, expressly in lieu of all other remedies including claims for special or consequential damages. SELLER
NEITHER MAKES NOR ASSUMES ANY OTHER WARRANTY WHATSOEVER, WHETHER EXPRESS, STATUTORY, OR
IMPLIED, INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS, AND NO PERSON IS AUTHORIZED TO
ASSUME FOR DX ENGINEERING ANY OBLIGATION OR LIABILITY NOT STRICTLY IN ACCORDANCE WITH THE
FOREGOING.
©DX Engineering 2020 DX Engineering®, DXE®, DX Engineering, Inc.®, Hot Rodz®, Maxi-Core®, DX Engineering
THUNDERBOLT®, DX Engineering Yagi Mechanical®, EZ-BUILD®, TELREX®, Gorilla Grip®Stainless Steel Boom Clamps,
Butternut®, SkyHawk™, SkyLark™, SecureMount™, OMNI-TILT™, RF-PRO-1B®, AFHD-4®are trademarks of PDS Electronics,
Inc. No license to use or reproduce any of these trademarks or other trademarks is given or implied. All other brands and product
names are the trademarks of their respective owners.
Specifications subject to change without notice.