|
|
|
Tapping Point
This shows the tapping points on the elements. Care needs to be taken when doing this, double check your measurements before you start cutting the insulation. Twist the 2 conductors together and solder. |
|
|
|
Hot Glue
Not a very good pictue but shows the tapping point with some hot glue added to seal it. |
|
|
|
Heat Shrink
To completely seal the tapping point I found that by putting a piece of heat shrink over the hardened glue and then using a hot air gun the glue re-melted and was forced out of either end of the heat shrink as it tightened up over the joint. This makes a very strong and very waterproof conection. |
|
|
|
Feed Point 1
In this version you can see I used a much large box for the feed point however I used the same basic idea as before using chocolate blocks to make up the feed point. |
|
|
|
Feed Point 2
Another view of the feed point in it's early stage of construction. As you can see both wires from each element are connected via the feed point. One linked straight across to form the loop whilst the other will be linked to the coax connector. |
|
|
|
|
Feed Point 3
Side view showing the holes drilled to take the 5 elements |
|
|
|
Feed Point 4
All the elements are now fitted along with the PL259 chassis socket and the air wound balun. |
|
|
|
Feed Point 5
Plenty of hot melt glue to seal eveything up. |
|
|
|
Antenna Centre
Similar to Cobwebb 1 I stuck with using aluminim box and plate to construct the centre part of the antenna. This time I used just a single plate and thought a bit more about how to mount the antenna. I made my own clamps by bending pieces of 6mm SS studding. All fittings are 6mm SS with washers and lock nuts. |
|
|
|
Top View Of Centre
|
|
|
|
|
Finished Centre
This shows the centre complete ready for the feed point and spreaders. |
|
|
|
On The Pole
Shows how the antenna will fit to the final pole. |
|
|
|
Complete Feed Point
The feed point now complete with it's lid and mounted on to the antenna. |
|
|
|
Element Fixing
Here you can see the combination of cable ties and hose clamps to hold the elements in position. This makes them fully adjustable but you need to take car not to over tighten the hose clamps as they will crush the fibreglass poles. |
|
|
|
Final Assembly
The final assembly is quite straight forward once you got the feed point and the spreaders mounted. |
|
|
|
|
Element Ends
Again the trusty cable tie comes in to good use to adjust the spacing of the element ends. Also note the hot glue melted over the end to make them water proof. |
|
|
|
On The Air
Finally finished and mounted on a 21 foot scaffold pole in the garden. Of course by this time I had already tuned the antenna whilst on the ground so no need to take it down again. |
|
|
|
The End
|
|
|