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Let's see if this autotransformer works. #AmateurRadio #HamRadio

Neil E. Hodges

2025-11-16 05:28:45


All that work to build a parallel coax transformer and it still doesn't cover the whole 6m band. :(

I don't know why, but this LMR-240-75 was way harder to strip and break out into terminals than normal 50Ω LMR-240 is. :/

#AmateurRadio #HamRadio

Parallel coax transformer to step the impedance down by half, for 6m
NanoVNA: SWR of 1.048 @ 51.7 MHz, but the SWR dip doesn't cover the entire 50-54 MHz band

#hamradio #amateurradio

reshared this

in reply to Lieven - DF1CN

Neil E. Hodges
Neil E. Hodges
•
It's doing what it's supposed to do, but I need to add a variable capacitor to compensate for the added inductive reactance.
Decent impedance match @ 50 MHz (X = 32.61 + j3.152Ω); SWR = 1.544)
Dipole resonant frequency @ 52 MHz (X = 15.55 + j26.44Ω); requires compensation for the inductive ractance added by the autotransformer
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