Placement of a HTM-10 aluminium telescopic (click) mast. Approximate 10m high.
Up to three RG-58 coax cables can be fed through the mast tube.

• Timelapse: Raspi-R Android app + Raspberry Pi 
• more info: raspi.vandenhoff.info

 

A good begin for antenna experiments...

First create some extra antenna attachment points. Using four U-brackets will reduce stress on the main tube.

Guying

The telescopic mast can be guyed on any height due to the use of pulleys (see below) and rope drums (right).

Started guying with 4mm (red/black) Hamrope.
Replaced the Hamrope with 6mm Mastrant rope (blue/black) for more strength and better stability.

Hoist

One extra (smaller) pulley is mounted to have the ability to hoist a wire antenna to just below the guying point.

Guy rope tension

HamRope and  Mastrant guying ropes have high strength, negligible elongation, low wet-ability, excellent UV radiation resistance.

But they still stretch out a little when becoming wet.
And most of the time when it's windy and need good rope tension, ... it rains.

A fence compression spring in used in one of the guying lines to determine wire tension.
The flexibility of the mast distributes the tension more or less equally across the three guying ropes.

A spring has a linear distance to force ratio.

Experimented with several springs to get the right tension and reach.

September 2017 setup

Moved the D-130 Discone to fixed lower pole. Reducing weight and wind load for main mast.
This also makes room for a third HF antenna.

Glass fiber stackable poles

To support the wire antennas.

Adding End-Fed for WARC

A second impedance transformer, housed in ABS 82 x 80 x 55 mm (ip65) box, for the WARC End-Fed antenna is added.

The lid of the box is mounted to the mast. This makes switching a transformer easy.

EANTENNA EA270ZB13 5+8 EL. 144 MHZ./432 MHZ