ENDFEDZ
EF-6
6M END FED DIPOLE
ENDFEDZ ARE MONO BAND ANTENNAS. USE ON BANDS OTHER THAN
THE DESIGN BAND WILL RESULT IN SIGNIFICANT COAX RADIATION
AND MAY RUIN THE MATCHBOX
ASSEMBLY
1. This antenna is essentially a half wave dipole with one important difference– the feedline
is at the end of the antenna. The antenna is suspended at its ends by the two included end
insulators– one of which is integral to the matchbox.
2. In order to have the least possible influence on the antenna, insulated lines are
recommended for attachment to the insulators. The antenna may be suspended
horizontally, vertically or sloping. Portable operation is easily accomplished by
suspending the far end from a tree limb and letting the matchbox hang just above the
ground.
3. The antenna has been used from hotel rooms by hanging the matchbox end just outside
the window and letting the far end hang, or preferably pulling it away from the building
with a guy attached to the end insulator.
4. Tuning is best accomplished by using an antenna analyzer attached to the far end of the
coaxial cable that will be used with the antenna. Once the initial resonant frequency is
established, the antenna may be tuned just like a dipole. Shortening the far end by 1” will
raise the resonant frequency approximately 150 kHz. Trim or (better) fold the wire back
on itself to shorten the antenna. If too much wire is removed, the included tuning stub
may be attached to the 10-32 stud at the matchbox end and trimmed to establish
resonance to the desired frequency (Fig.2). Fine tuning may be accomplished by
changing the orientation of the stub with regard to the main radiator (I.e. rotating the stub
and retightening the hardware. Tighten the #10 hardware just enough to compress the
lockwasher.
5. Once you are satisfied with the overall length of the radiator, lace the wire through all
three holes in the insulator as shown in Fig. 1.
6. Fig. 3 illustrates some mounting ideas.
Fig. 3
SPECIFICATIONS
Polarity: Depends on mounting configuration
Design Z: 50 Ohms
Frequency of operation: 50-54 MHz
V.S.W.R. Bandwidth: 1000 kHz 1.5:1
Power Handling: 100 watts
Weight: 0.5 lbs
Length: 114”
Hardware: Stainless Steel
Connector: Silver/Teflon SO-239
Radiator: #18 AWG Poly Stealth
EndFedz ®
Vibroplex LLC
1001 N. Broadway St.
Knoxville, TN 37917
(865) 309-5073
www.vibroplex.com vibroplex@vibroplex.com
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