| If you have say two HyTower antennas and you want a
to phase them successfully on all bands. It can be done and we
will show you how. Dave set up his to Hytowers so they were 1/4 WL apart
on 80 meters. As seen in the figure above there are 3 basic components
although you could use just the StackMatch II and the Delay line
selector. Here we added a wideband 180 degree phase shifter to
increase the choices of phase selections for each band. The two
Antennas are fed with equal lengths of 50 ohm coax.
The Delay line selects in increasing order 1 coaxial stub, then adds
the 2nd and 3rd and so on in increasing order as you use the selector
switch. Therefore you can create delays that are appropriate for
all bands 160 - 10 meters. You can quickly spin through the
combinations of your delays and hear the results of different phases
immediately on the signals your listening too. W9AD reports 20-30
dB differences on all bands with his two HyTower array spaced 67 feet
apart.
Listen to this MP3 file of W9AD on 20m AM recorded in
Calgary Alberta, Canada by VE6CQ>
W9AD20MAM.MP3
Also listen to the array on 75M
AM. You can hear Dave switching the 180 degree phase shifter in and out
while he has all 6 of the delay lines in giving a 135 degree phase shift
to the system or -45 degree shift. >
Steve/WA1QIX test.MP3
The heart of the system is the Coax Delay Line selector below. It will
handle 5KW+ and is compensated inside to keep VSWR to under 1.1:1 on the
connected antenna no matter what delay lines are selected. |
