Even though it can be very windy here, I decided to put up a 5 Band, HF, Quad antenna for a number of reasons...
I had a Quad at the home QTH some years ago and know that they work very well at a low height... I decided on
the Cubex Quad made in the USA... I ordered heavier gauge wire than is usually supplied and when delivered,
everything was accounted for...
A flat area of about (30 by 30) feet, ( 9 by 9 ) metres is needed... The fibreglass spreaders are strong but lightweight
and need to be pegged to the ground to enable the fitting of the wires...
On the 20 and 17 Mx loops, ' wire wraps ' as shown are fitted to minimise flexing of the wires where they go through the
spreaders and to maintain the shape of the elements... Also, the ends of the wires need to be soldered so that they
can be pushed through the spreaders more easily...
Since we have no electricity supplied to the area here, I ordered the matching transformer, even though the performance
of the antenna wont be as good as if an antenna switch with matching coax sections was used to feed the Quad...
It took me about a day and a half to assemble the 2 halves of the antenna...
Be careful not to overheat the balun when soldering, like I did... It would pay to connect the wires to the solder lugs
and then take them off the balun, one by one, before soldering...
The boom and feedline were connected to the Driven element while it was still on the ground...
A steel and wooden platform was installed half way up the tower to support the antenna... The two halves were lifted
and pushed up onto the platform from where the Quad was raised to the top of the tower using rope and a pulley...
It was then lifted onto the central pole and the U bolt nuts tightened...
The 50mm (2 inch), 6 metre (20 foot) pole running through the centre of the tower was reinforced by a 2.5 metre sleeve
of pipe about 2 metres down from the top to prevent it from bending... The 6 metre pole was then raised to a total
height of 10 metres (33 feet) by adding, at ground level, two lengths of 2 metre pipe as seen in the picture below...
Two of us stood on the central platform and managed to lift it... It was very heavy...
Rotator housing - a Prop Pitch motor...
Information about Cubex Quad antennas can be found at Cubexquads.com
For Wallpaper images of this particular Cubex Quad, click here
To see the construction and installation of the 20 foot Tower, click here
This antenna performs very well. I have noticed that it can 'open and close the band'.
What I mean by that is that you seem to be able to get through at the opening of the
band and also when it is closing. Where as other antennas I've used can't do that.
One of its other characteristics is that it is very quiet on receive.
To see details of my 2 element Cubex Quad feed point matching Transformer, CLICK HERE.
Opens in a new window.
We replaced the wires of this Quad antenna as some of them had broken, having been in the air for about 10 years.
Images of the new wires can be seen below. The wires were replaced with high tensile fencing wire and the large 20mx
loops were strengthened by the use of 850lbs breaking strain UV resistant rope, 4mm diam. from DXEngineering.
The images below were taken in August 2021. Adrian from AGL Cranes took the photos while Randal, his offsider and I soldered some of the wires.
Rob, VK5SW showing the broken wires on his HF Cubex Quad antenna
which need to be replaced. March 2020. Runs 6 minutes.
Repair and installation of Rob, VK5SW's 2 element HF Cubex Quad Antenna. June. 2020. 18 minutes.