Chris Cheney wrote: >> 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. > > Chris > G3RSE > > Nothing to do with impedance transformation. Just the phase shift associated with propagation down the cable and back is then 0.
Bruce _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
