You don't change the SWR by changing the length of the cable.? It's the dipole itself that needs adjustment.
Your goal is to adjust the dipole length for minimum reactance at the operating frequency.? This usually coincides with lowest SWR but not exactly.? Cable length is immaterial.
Perhaps you are coupling some metal near the ends of the dipole and that is adding to the dipole electrical length.
73, Bob
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On Sunday, August 23, 2020, 02:39:47 PM PDT, ea3iji@... <ea3iji@...> wrote:
Hey,
I've just received my nanovna this week, and started to optimise the length of my half wavelength dipole wire, it's just two 5 meters wires connected with a 1:1 balun and attached to the facade of my balcony to work at in the 20meter band.
I start cutting the cable until I reached the minimum SWR measured in the Nanovna. but to my surprised I ended up with 4,25m, far from the theoretical 5 meters, Have I done something wrong????
Sorry if the it is a stupid question, I'm just a newbie.
Thank you!!!!
