2/5 kW Vertical Feedline Current Choke
If your antenna SWR is already low and you wish to reduce feedline radiation and improve reception, a Feedline Current Choke is recommended. Adding a DX Engineering Feedline Current Choke at the base of a vertical antenna will substantially reduce unwanted feedline radiation (RFI), reducing the need for improved station grounding.

When quarter-wave antennas are constructed over a good radial system, they have a feedpoint impedance of about 36 ohms. When they are constructed over less than a good radial-system there is a loss introduced into the feed system that adds to the 36-ohm figure. This improves the SWR but there is a loss in the efficiency of the antenna, signals transmitted and received have a higher take-off angle and often there is current introduced on to the feedline.

With a ground-mounted quarter-wave vertical, regardless of the radial situation, but especially with poor radial systems, the feedline can become part of the radial system, causing RFI and poor antenna performance. By using a VFCC at the feedpoint, the feedline is effectively de-coupled from the antenna system, preventing interaction with the radial system, improving antenna efficiency. You may notice improved bandwidth as well.

The Advantages of Using a VFCC:

• Prevents unwanted RFI by eliminating feedline current and radiation
• All power goes to the antenna, improving efficiency
• Reduces noise or unwanted signals picked-up by the feedline
• Overcome a less than optimal ground system
• Bracket isolates the VFCC case from ground for best de-coupling

The DXE-VFCC H05-A Vertical Feedline Current Choke is rated for 2 kW continuous, 5 kW intermittent power. It is designed for use with coaxially fed, 50 Ω HF antennas including 1/2-wavelength verticals, dipoles, ground-mounted vertical antennas such as the Hustler BTV series, the DX Engineering 40 Meter Vertical or 80 Meter Vertical and others.

The Vertical Feedline Current Choke Includes:

• A DX Engineering 2/5kW Vertical Feedline Current Choke
• Insulated Mounting Plate and Hardware: Used to mount the VFCC at the base of a vertical or to a ground-mounted pipe.
• Two Tinned Copper Braid Straps: Used to establish connections between the vertical, VFCC and a Radial Plate or system.

Optional Parts Needed, not Supplied, Sold Separately:

• VFCC Mounting Plate Saddle Clamp: A V-Bolt Saddle Clamp, DX Engineering V-Bolt Saddle Clamp DXE-CAVS-1P, is needed to mount the Insulated Mounting Plate to a 1/2 to 1-3/4 in. pipe and must be purchased separately. Also available are the heavy duty DXE-CAVS-11P for 1/2 to 1-3/4 in. pipe and DXE-CAVS-2P for 1 to 2 in. pipe.  If you are mounting the VFCC Plate to a 4X4 or 6X6 wooden post, then no clamp is necessary. 

VFCC Mounting Plate Install Example Image

DXE-VFCC Instructions (373K pdf)

The DXE-VFCC Vertical Feedline Current Choke is designed for use with coaxially fed, 50 Ω HF antennas including 1/2-wavelength verticals, dipoles ground-mounted vertical antennas such as the Hustler BTV series, the DX Engineering 40 Meter Vertical or 80 Meter Vertical and others.

Here is a typical installation by W4OE with his Force12 Flagpole Vertical Antenna.

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, adjustments or repairs, or any other work, unless such charges are authorized in advance by DX Engineering.

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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 enviromental 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.

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Part #	Part Name	Ship By	Price	Add to Cart
DXE-CAVS-1P	V-Saddle Clamp, 1/2 in. to 1-3/4 in. O.D. Applications	Ship Tuesday	$ 9.95
DXE-CAVS-11P	V-Saddle Clamp, 1/2 to 1-3/4 in. O.D. Applications, 5/16-18 thread	Ship Tuesday	$ 10.45
DXE-CAVS-2P	V-saddle clamp, 1 to 2 in. O.D. Applications	Ship Tuesday	$ 11.95