- 5 -
3. Slide the 2" OD element that has the EXTREN
®
insulators installed in the U-Bolts as shown
below. Adjust the EXTREN
®
insulators so they are centered on the U-Bolts. Tighten the U-
Bolts evenly so the length of the exposed threads is approximately equal. Any U-Bolt should be
tightened evenly from side-to-side with an equal amount of thread above each nut.
4. Install the studded band clamp (antenna feedpoint) at the bottom of the 2" OD aluminum
element as shown below. Use a small amount of Penetrox A between the studded band clamp
and the 2" OD aluminum element.
5. Assemble the vertical sections as shown in
Figure 1
using the stainless
steel element clamps allowing an 8 inch overlap between the 72" long
element sections. The top 36 " element is slid in 12". Slide all the clamps
over each section before putting them together. You can lightly tighten the
clamps just below the slits in each section to hold them until needed.
Align the clamp screws on each section to face the same direction. At final
assembly, body of the clamp should be positioned between the slits in the
tubes and 1/8" from the edge of each tube as shown to the right. The top 3 foot section is
inserted 12" and the three 6 foot element sections have an overlap of 8" to give you a starting
overall length of 24 feet. During tuning, you will make slight adjustments to get the center
frequency to where you want it.
