I am building a set of Phased verticals for 30M. I was going to switch in a quarter wave length of coax using a DPDT coaxial relay, to steer the signal 90 degrees (Broad side to End fire). I went loo
Why go to all that expense of coaxial relays for 30 meters? Why not just use a simple spst relay to short out the quarter wave loop when you don't want it? Build the whole thing in a box with connect
Hi, Cliff. To change from broadside to endfire you need 180 degrees phase shift, not 90 degrees. You can get that with either a half wavelength of coax (adjusted for velocity factor) coax or by switc
I don't follow - could you explain it to me? Thanks Scott --Original Message-- From: towertalk-bounces@contesting.com [mailto:towertalk-bounces@contesting.com]On Behalf Of David Gilbert Sent: Sunday,
First off.. a quarter wave of coax won't change the phase 90 degrees (unless your verticals are a LONG ways apart.. wavelengths) because of the reactive feedpoint impedances and the mutual coupling b
If you just short out a quarter wave loop, you're essentially putting in a stub (open ended stub 1/8th wave at half the Z of the line). A SPDT gives you either the 1/4 wave in line, or an open 1/4 wa