If you calibrate with the measurement plane at the antenna end of the choke
balun, you can measure the antenna impedance correctly. You need to
calibrate out the choke balun.
Dave - W?LEV
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On Fri, Aug 25, 2023 at 3:32?PM Fran?ois <18471@...> wrote:
I have traps doublets (3 or 4 bands) connected by about 10 m of coax to
the station. I have always measured the impedance of my antennas at the
level of the center by calibrating (open short load) at the end of the
caoxial removed from the antenna, from my PC and nanovna-saver. I then
calculated and made my 'L' adapters to place them in the center of the
doublet. It worked without a problem, without a chock balun. The ROS
becomes correct and it is correct at the station, at the calculation
frequency only, obviously
When I go to the nanoVNA of the chock balun, I doubt that we can measure
anything correct beyond the chock balun. But hey, hope gives life, as well
as those who sell chock-balun.
73
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F1AMM
Fran?ois
--
*Dave - W?LEV*
--
Dave - W?LEV
