Flower Pot Antenna Gain

Po zestrojeniu pracuje w paśmie 2m i 70cm.

Flower pot antenna gain. The gain sleeve antenna achieves an effective radiating element length of one wavelength and since the aperture is twice that of a half wave dipole a theoretical gain of 3dbd gain over a dipole could be achieved. Picture taken by susan gordon davids wife david g6enn enjoys cycling so decided to try push bike mobile with a flower pot antenna. Learn more about the history and development of the antenna together with detailed plans and instructions by visiting john s website.

Half wave flower pot antenna. The effective radiating element length of the single 5 8 flower pot is 7 8λ suggesting it would have somewhat less than 2 5dbd gain. The vk2zoi flower pot antenna.

Anyway the credit here must go to vk2zoi. You will strip off some black outer sheath the metal braid inside leaving the centre metal core protected in the white inner dielectric material. To construct the antenna first select a suitable length of grey 25mm conduit as a minimum 1m but if you make it longer you will have more room below the coil to attach to your antenna support.

Theoretically this should provide an antenna gain of 3dbd at 2m. Think about your mounting choose a suitable length. Experimental dual band high gain flower pot antenna.

However note that the handbook indicates that in practice the gain sleeve antenna would realise about 2 5dbd. All credit for the design and instructions goes to john bishop vk2zoi. I do not have a means of accurately measuring antenna gain but set up each antenna with a switched attenuator in the feedline to a receiver.

A piece of coax in the middle inserts a half wavelength phase shift to make the second half radiate effectively. There are two possible explanations as to how. The attenuator was not ideal for this purpose it had only 3 6 10 and 20 db steps.