2020
Preparations
The BICC top section features the same 18-in face and 7/16-in solid serpentine Zig-Zag bracing as the standard BICC tower sections and it also comes with a tapered top and integrated support. First these sections needs cleaning and painting.
Measure
The intermediate space between the support towers is 33m
Using old rolling scaffold aluminium tubes that are cut on 1.5m each.
Bought some ball bearing pulleys with extended swivels to support the Dacron ropes.
NVIS Delta Loop
Big Full Wave Loops provide good NVIS at their native full wave frequency. Using a 1/4 inverted V @110ft (33m) for EU and some DX, this horizontal monoband delta-loop is a experimental setup for NVIS communications within PA.
The feedpoint of a full wave length (1 × λ ) loop has an characteristic impedance of approximately 100Ω. A horizontal loop with a circumference of approximately 83 m is a good NVIS antenna.
PA1A is using a 1/4 λ stub matching the antenna to 50Ω
Ceramic insulators from a former commercial broadcast station.
Composing the center suspension point from the junk bin.
Suspension point
Details of the feedpoint.
Cutting 20, pieces DACRON wires for the pulleys
Wires
83m and 8mm copper bronze antenna wire is fairly heavy, therefore using also 8mm DACRON
Measure 3x28m for the corners of the triangle.
Using stainless steel wire clamps
Installation
Calculated teroretically, excat turns out to be correct in practice.
Connector
Using 7/16" male-male and sealing with Scotchfill anf finishing with Scotch tape with sufficient force.
Finish: Burying the coaxial cable in the lawn
