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Appendix C - Optional Vertical Feedline Current Choke
A
DXE-VFCC-H05-A
Vertical Feedline Current Choke or line isolator is used to optimize the
performance of many kinds of antenna systems, including vertical antenna systems. It prevents
unwanted RFI by eliminating feedline current and radiation. By eliminating stray currents from the
feedline all power goes to the antenna, and any noise or unwanted signals picked-up by the feedline
are eliminated, improving efficiency. Using a Vertical Feedline Current Choke can also help
overcome a less than optimal ground system.
Figure C-1
shows a
DXE-VFCC-H05-A
Vertical Feedline Current Choke kit which includes a 2/5
kW current choke, an isolated mounting shelf, tinned pre-drilled braids, a stainless steel bracket and
stainless steel hardware. Also pictured below is the optional
DXE-RADP-3
Radial Plate and
DXE-
TB-4P
Tilt Base. The
DXE-SSVC-2P
V-Clamp used to mount the isolated shelf bracket to the 2"
O.D. mast pipe shown in the picture, is not included and must be purchased separately.
After mounting the VFCC, connect the 8-1/2" braid from the feedline bolt on the vertical to the
VFCC, making sure you are using the terminal closest to the
Red
"D"
in
D
X Engineering
on the
VFCC label. Twist the braid as shown. Connect the 7-1/2" braid from the other VFCC terminal to
the closest radial wire bolt on the Radial Plate. Do not ground the VFCC case. Your coaxial cable
will connect directly to the SO-239 on the VFCC. Do not use a bulkhead connector on the radial
plate for the coaxial cable feedline.
Figure C-1: VFCC Mounting Detail and Orientation
(shown with optional equipment)
The SO-239 and wire pigtail is not used
when using the VFCC.
The orientation of the VFCC, Tilt Base and
Radial Plate must be as shown to ensure
correct operation of the Tilt Base with the
VFCC.
The braid should not be able to touch the
VFCC case.
