Hi-Z Antennas HIZ-PC-4A Manual - Página 10

Navegue en línea o descargue pdf Manual para Antena Hi-Z Antennas HIZ-PC-4A. Hi-Z Antennas HIZ-PC-4A 19 páginas.

of about 75 pf. The older style Hi-Z amplifiers had nearly 20 pf input capacitance. The later Plus-6 versions

were about 18 pf input capacitance. The latest 2020-year versions are about 12pf input capacitance. A

continued improvement. The element insulators over the years started in the very beginning at about 100 pf

which quickly got changed to 20 pf or so. Keeping the insulator capacitance down and the element

capacitance up helps to reduce the affect of minor errors in construction.

This original picture of the second actual array element built shows how it was offset from the mounting

Tee post to reduce the parallel capacitance. The first element used was clamped right to the Tee post with a

single section of PVC pipe. These offset elements are still being used today in addition to some newer

designs. They started at the bottom with 10 feet of ¾ conduit with a welded junction to a 10 foot piece of ½

inch conduit. The Tee posts came from a farm store and were about 5 feet total length. The Tee post worked

well in fertile soil as a ground connection.

There have been several customers make similar elements as shown in the following pictures. The

elements and insulators have gone through several changes for the better after the following designs.

Aluminum tubing at Hi-Z Antennas was sourced from DX Engineering or Texas Towers.

Hopefully there is enough information following here to allow one to make their own elements or

purchase them from DX Engineering.

Examples follow