Antenna Assembly Instructions
(1)
Before assembly, verify all parts are included for proper assembly. The following tools will be required for assembly:
tape measure, phillips screwdriver, and two crescent wrenches or metric open-end wrenches.
(2)
Radial Assembly
. Assemble each radial trap coil (part #: 15210-15215) to a radial element (part #: 15216) using
fastener ring (part #: 15217); see figure A. Adjust for proper radial length. See table A (page 3). Lightly tighten setscrew at
this time, as later adjustment may be required for VSWR tuning.
(3)
Assemble mast pipe #1 (part #: 15205); double element trap coil assembly (part #: 15206); single element trap coil
assembly (part #: 15207); and mast pipe #2 (part #: 15208) together with self-tapping screws & washers enclosed (part #:
15211 & 15222). Align holes in each joint section and fasten.
(4) Assemble capacity hat assemblies (part #: 15223) with radials (part #: 15209). Assemble
80
m capacity hat (top) with
standard radials (13-3/4”). Assemble 40m capacity hat with 2 standard radials (13-3/4”) and 2 longer radials (20”).
Note: some applications will require adding additional longer radials to tune 40m bands to desired frequency. See #12
below for additional tuning info.
Secure radials with lock nut fasteners. Attach capacity hat assemblies in proper location.
Note: capacity hat holder is located 9.4” (24cm) below the top end of single element trap coil assembly. See figure B.
The lower holder is located 3.1” (8cm) below the top end of double element trap coil assembly. Align capacity hat assemblies
for proper appearance.
(5)
Attach support pipe to mast with brackets and U-bolts. Support pipe's bolt hole must be above brackets and pointed
away from mast (see figure C). Support pipe must be 4.7” (12cm) above tip of mast; this provides adequate clearance for
radial assemblies.
(6)
Lightly attach
element holders on support pipe.
Note: Damage may occur to support pipe if fastened too tight, as matching network will not fit into support pipe.
(7)
Insert coax-cable through support pipe and attach to matching network (part #: 15204). Align threaded hole with
matching network and fasten bolt.
(8)
Place assembled vertical elements on matching network with fasten bolts.
(9)
Attach radials to element holders (see figure D).
Note: Position of radials is not critical, but 80m and 40m radials should be positioned further from surrounding objects
or structures.
If mounting radials in one direction, 80m and 40m must mount on opposite ends from each other. You must lower element
holder 0.8” (2cm). See figure E.
(10) Thread radial until snug and reverse until water drain hole is in downward position (see figure D). Secure radial with
lock nut attached to trap.
(11) After antenna assembly is complete, securely faten all screws and fastener bolts.
(12) Check VSWR (see figure F) with quality meter (Bird, Coaxial Dynamics, Diamond, etc. MFJ Analyzer is not recom-
mended for this antenna) and adjust each radial to desires center frequency. Refer to table A for tuning adjustments.
Note: VSWR tuning may vary based on mounting location and obstructions.
40m tuning can be adjusted by adding additional longer capacity hat radials. The longer radials will have the effect of raising
the center frequency. Once adjustment range is achieved, 40m tuning radial can be adjusted for best VSWR.
(13) After antenna VSWR adjustment, an antenna tuner may be utilized to extend useable bandwidth.
We suggest mounting immediately beneath the antenna a one-turn choke coil of approximately 6-10” diameter. This will act
as an isolation choke, and release strain on connector. The coil diameter is not critical.
Note: Some cables require a larger diameter coil to prevent movement of center conductor. Tape coil to mast (see figure G).
