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Last night I could hardly sleep because I had to ever think about which antenna I should build. Ultimately I decided on the 4-element Cubical Quad-boom:
The reasons are as follows:
- high profit (12.3 dBi vs 9.9. dBi (Yagi))
- good F / R ratio
- Cost
- small size (a = 2.88 m, l = 5.13 m vs. 7.35 m x 5.39 m (Yagi).)
- is easier / more logical Matching (50 Ohm antenna resistance only a sheath wave barrier required)
- the SWR adjustment is done by moving the reflector to the boom
- suitable for portable applications (such as mountain DX)
The only disadvantage is the complicated construction.
This will be necessary in addition to the necessary impedance transformation is a more "tricky" task. The taut wire
(eg 10mm or 15mm DX Wire HO7KV Cu) must have no contact with metallic Elements have, therefore, to offer fiberglass or PVC pipe for the bars (spreader arms) on the cross. Only the cross-boom connector may be metallic in order to ensure greater stability (eg against wind loads). The connectors
I'll probably realized by means of aluminum pipe or rigid and flexible PVC and typical PVC pipe. The advantage here is in the low weight, ease of adjustment by telescoping adjustable PVC tubing and fiberglass rods, it is cheaper than all. This allows you to adjust the cross-wire holder and fix exactly by Gaffa tape pre-order it at the end fixed by means of screws or pipe clamp final.
In the course of the day will I construct the supports and draw.
The boom is possibly made Alurohrelementen because I do not just 6m can transport by car.
extent for now.
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