Hy-Gain AV-18HT, Instruction Manual

Page: 17 / 36

160 Meter Operation
Erection of Tower
By adding one of two available kits, 160 meter
operation can be added to the 18HT `Ey-Tower".
these kits are available from
Hy-Gain, 308 Industrial Park
Road Starkville, MS 39759
USA.
Kit Number LC-160Q is a loading coil that can
be added at the tower base as shown in Figure
13. This coil is four turns per inch, 3" I.D. by
10" long. After the coil is installed, the wire clip
should be attached at the point that gives mini-
mum VSWR at the frequency you wish to
operate on. This coil should be bypassed when
operating on 20 or 75 meters.
WARNING
When using the LC-160Q Modification Kit
added to the 18-HT on 160 meters, do not
exceed 150 watts output power (300 W
P.E.P. out). Power levels in excess of this
limit will cause the antenna to arc.
Kit Number MK-160 is a 40 meter trap and wire
assembly that can be added at the top of the
tower as shown in Figure 17. This kit will
provide a greater band width and a higher
power rating than the LC-160Q. It also provides
fully automatic band switching from 160
through 10 meters.
Install the tower legs with hinges attached onto
the base assembly. Do not tighten screws at this
time.
WARNING
When installing your system, take extreme
care to avoid any accidental contact with
power lines or overhead obstructions.
Failure to exercise this could result in
serious or fatal injury.
Lift the antenna and walk it into a vertical posi-
tion. Install the remaining leg brace and bolt the
leg to the base assembly as shown in Figure 14.
Tighten all screws securely.
Insert the 80-meter wire through the eyebolt in-
stalled at the tower base. Wrap the wire around
itself several times to insure a good tight
connection. Solder the connection for the best
electrical connection.
Adjust the eyebolt until the wire is taut.
Attach the solder lug on the 80-meter wire to
the tower base assembly as shown in Figure 14.
Figure 14
Tower Leg Attachment to Base