RW3DKB Loop Balcony Antenna

Picture 1

Substitute Matching Line

Picture 2

Nails for Fixing the Loop Antenna

Antenna is fixed inside of nails having shape of the letter J. Upper end is hammered to the wood. Picture 2 shows the nails. In this case you may slide the antenna on to the nails and change the polarisation of the antenna. If the antenna is fed in the center of the side the antenna has vertical polarisation. If the antenna is fed in the center of the lower side the antenna has horizontal polarisation. It gives some possibility for experiments with different polarisation.

The length of the matching line is lambda/8 for the 10 meter band, the main antenna's band. The matching line connected to the 4:1 BalUn. It was used commercial made RBA 4:1 Balun from LDG Electronics. Picture 3 shows balun at the antenna. Coaxial cable from the balun is connected to Z100 automatic antenna tuner. It was used 50- Ohm coaxial cable in 5 meter length (by the way the length may be any what is ever you want). It was installed ferrite clips on the both sides of the coaxial cable. This tuner could match the antenna on all amateurs HF bands from 10 to 80- meters with SWR no more 1.5:1.0.

It is possible use a home brew balun. Home- made balun contains 10- 12 turns on the ferrite ring with permeability 100- 1000 and OD 30- 60- mm. The balun is wound by twisted pair and wire is connected to the matching line and coaxial cable as it is shown on the Figure 2.

Picture 3

4:1 Balun from LDG Electronics at the Antenna

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