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Problems with Wimo 70cm Helix


Since a few month's I use here an helix antenna from Wimo, but am not really 
happy with it. Matching is ok at about 433MHz, but it seems impossible to get 
an raisonnable matching around 435. Does anyone know this design and maybe 
has a hint how to tune this antenna. I must admit that even generally I do 
not know how to time helix antennas.

BTW, it is the large model, 70/2.

Thanks, Luc

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