MFJ 1798 - Page 15

MFJ-1798 Vertical Antenna Instructions
14
21- Pass the threaded end of the rods through the holes of the first X-bracket. Thread one 10-32
nut down 2" on the threaded portion of each rod.
22- Pass the threaded rod ends through the four stub mounting holes at the outside middle of the
counterpoise support plate. Thread four 10-32 nuts on the rods and tighten snugly.
Note: Install the 17 and 15 meter stubs, and the 10 and 12 meter stubs,
on opposite sides of the mast.
23- Connect the remaining 3/16" rods to the previously installed stub sections using the
construction chart above. You will use the remaining couplers to fasten the various lengths
together (refer to Figure 5 for location of elements).
Locate the following parts:
Two #10 nuts
At this point you should have
four 53" stubs hanging down
from the counterpoise support
plate. These stubs should be
parallel with the main antenna
mast. In the following steps, you
will add the proper additional
physical length to make each
stub look like a 1/4 wave
radiator on 10, 12, 15 and 17
meters.
The 17 meter stub (the longest
stub) should be located on the
same side of the main mast as
the balun coil. The 15 meter
stub should be on the exact
opposite side of the mast.
Figure
5
10m
12m
15m
17m
66.5"
72"
72" 15"
41"
48"53"
53"
53"
53"
Threaded Ends