For mounting a 0.750 inch OD Bead Choke* 4 inches away from a 2 inch OD antenna boom or mast

DX Engineering Bead Choke Standoff Kits are mounting systems, made of fiberglass, PVC and stainless steel hardware, which are available in four versions. Two sizes of PVC cradle tubes handle two different types of RF bead chokes; 3/4 inch outside diameter (OD) ferrite beads on RG-400 size cable* and 1 inch OD ferrite beads on RG-213 size 0.405 in. coax cable. Each are offered with two different boom size clamps, 2 inch OD and 3 inch OD. They simply hold an RF bead choke and 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.(*COM-CFC-50 not included)

Example of installed Bead Choke Standoff Kit on a Yagi

Installed RF Bead Choke on Yagi with Bead Choke Standoff Kit

These images show a typical Yagi antenna before and during tower installation, with a DX Engineering Bead Choke Standoff Kit model DXE-BCSO-3-100 holding these optional items (not included):- DXE-RFC-160-20 DX Engineering High Impedance Common Mode RF Choke Kit- DXE-213U DX Engineering RG-213U Coaxial Cable- DXE-FPC-SO239 DX Engineering Feedpoint Connector

DX Engineering Bead Choke Standoff Kits bring a practical solution to a serious problem when ferrite chokes are placed directly onto the metal boom at the feedpoint of beam antennas. A number of Amateur Radio operators and antenna engineers have known for years about the superior choking function of many ferrite toroids beads placed directly 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.

The absolute superiority of RF chokes made of many beads on the feedline, over the traditional enclosure balun, is becoming better understood in Amateur Radio. They achieve the best possible RF isolation of the feedline from the antenna and provide completely balanced currents at the feedpoint. Plus, they provide quieter reception with reduction of common-mode noise. Keeping these RF Chokes away from metal preserves the optimal function of this method of directional antenna feedpoint current balance and isolation. This mechanical requirement is simple and practical with DX Engineering Bead Choke Standoff Kits.