DX Engineering DXE-BCSO-2-075 Instructions 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 0b

© DX Engineering 2021

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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