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Appendix C - Optional Vertical Feedline Current Choke
The
DXE-VFCC-H05-A
Vertical Feedline Current Choke is used to optimize the performance of
many kinds of vertical antennas. 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. Note:
The Vertical Feedline Current Choke cannot be used if your vertical antenna is part of a multi-
vertical phased array.
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-CAVS-2P
V-Saddle clamp used to mount the insulated shelf bracket to
the 2" OD mast pipe shown in the picture is not included and must be purchased separately.
After mounting the VFCC as shown, connect the prepared 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 shorter braid from the
other VFCC terminal to the closest radial wire bolt on the Radial Plate.
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.
