First you must include the velocity factor of the wire - typically .95.? That brings the length down to 4.75.? Also, as the wire gets closer to the ground, the ground capacity makes the wire look longer..? 4.25M sounds? a little low.? Are the wires near any metal?
Dave - WB6DHW
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On 8/23/2020 1:53 PM, ea3iji@... wrote:
Hey,
I've got a halfwavelengh dipole hanging on the facade of my balcony, it's two 5 meters wires connected through a 1:1 balun to work in the 20m band. I tried to optimise the length by cutting wire to go to the minimum SWR measured on the nanovna, but to my surprised I ended up with only 4,25m wires, far from the theoretical 5m.
I'm just a newbie so I might have done something wrong but I don-t know what, can anybody give me a hint??
Thanks in advance!!!
