[time-nuts] Non-impedance matched antenna cables
chris.cheney at tesco.net
Fri Jun 13 05:53:43 EDT 2008
> Before you do this find out what the reflection coefficient is for the
> Thunderbolt input and the active antenna output when using a 50 ohm cable.
> The active antenna may not be that well matched to 50 ohm cable.
> Then adjust the cable length to an odd multiple of half the signal
> wavelength in the cable.
> If done well this should reduce the effect of such reflections by more
> than 30dB. This of course only works with a single frequency antenna.
FWIW whether even or odd makes no difference for HALF-wavelength
multiples - both provide a 1:1 impedance transformation.
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