KC9VF
192 Foot Vertical Antenna Project
This antenna is used on 160, 75, 40 and 20 meters.
The first three thumbnail photos show a "rat hole drilling rig." It has the capacity to drill a 40 inch hole 90 feet deep. For this antenna project, it drilled three holes 40 inches in diameter down 17 feet. These holes are for 3 elevated guy piers.
The next three photos show the lightning protection grounding system. This system consists of 4 twenty foot long copper pipes spaced 12 feet from the tower base pier. The grounding pipes are inserted into 4 inch holes 25 feet deep. This puts the copper grounding pipes into 12 feet of ground water. The four pipes are connected to the tower base with 4/0 copper cable. A layer of dirt and gravel will cover the grounding cables. The radial system will be laid out on the layer above the grounding cables. The copper ring around the base pedestal will be the common connection point for 72 radials.
The first 60 feet was erected followed by the remaining 132 feet.
A crane arrived on December 17th 2003 to stack the remaining 132 feet on top of the standing 60 feet.
The erected tower stands 199 feet 11 inches above ground to tip of air terminals.Dec. 18th, 200 feet of 7/8 inch hard line is routed and connected.
December 19, 2003. With the help of WAÆZHH, a LC tank circuit match is hooked up and working. Reports from WÆVMC, WA1HLR, WAÆZHH, WD5BZO are that my signal is doing well.
The tower is series fed using a tuner which consists of 4 low pass L networks
for 160, 75, 40 and 20 meters. Included is a series trap to notch down a 1240
kHz broadcast station located about 4 miles away. There are switching
provisions for an additional band not yet decided.
The tuner is controlled from the ham shack computer as well as over the internet while operating remote control.
The meter is connected to a Bird line section (50 watt slug) at the transmitter end of the transmission line and is used for tuning the L networks.
During storms or power outage, a large normally closed relay in the tuner cabinet shunts the tower to ground. Also there is a spark gap at the base of the tower connected to the lightning ground system
Click On Thumbnails For Close Up View
1900 kHz Pattern | 3880 kHz Pattern | 7290 kHz Pattern |