Array Solutions Four Square Manual do utilizador - Página 5
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Imprimir páginaVSWR and Matching
Tuning this unit requires a good Oscilloscope or other instrument that can measure phase and
magnitude. A scope is most useful and we recommend at least a 100-500 MHz scope for good
accuracy. If you have a 30-50MHz scope it will probably be OK.
Hint: Make four wire jumpers 8 inches long with alligator clips to allow you to move coil
taps easily while adjusting the network the first time. Don't solder the foil taps until you
have the system completely tuned, by replacing the jumpers with the copper foil supplied.
Hook up a signal generator to the input connector, it can be a VSWR antenna analyzer or
rig set to 1 or 2 watts.
Be careful not to put too much power since you can be burned. Tune it to the desired
frequency you intend to use.
First: Tune the normal directional mode tap of the L1-C1 input network.
The goal is to get a fairly good VSWR so that we get some power into the system.
All Antennas and the 180 degree phase line must be connected. Controller set to 1
default. Tuning the system for good VSWR is a fairly simple procedure and can be done by first
adjusting the tap of the input L network coil for minimum SWR using one of the jumpers you
made. You will also have to adjust C1. If you need more capacitance you may need to try adding
a capacitor by touching it from the input connector side of the coil to ground. If the SWR goes
higher you know you must remove capacitance. If the SWR goes lower, you of course will need to
add capacitance. There are extra ceramic caps included with the system. Repeat this procedure
until you have a good match to your system. Note: These settings will be changed later once you
get everything tuned up so don't solder any foil taps. We have adjusted the system for a SWR of
less than 1.1:1 at the desired frequency using simulated antenna loads at the factory to give you
a good starting point. Later you will tweak this for a perfect match once everything else is
adjusted.
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Second: REMEMBER THIS
Don't get overly finicky about this initial tuning process. It is just to get a "ball park"
setting. You will tweak it again later after the remaining adjustments are made.
Third: Tuning the two Phase shift Networks.
Please review the Theory of Operation section on page 9, and note that each antenna's physical
characteristics may require different phases and magnitudes on the delayed elements. When it is
stated that the phase should be -224 degrees at .8 of the magnitude of the 0 degree reference
channel, that is based on the model which is made of ¼ WL verticals spaced .25 WL apart. Your
installation may be different if you have sloping elements or other geometrical differences. You
should model your antenna (or have someone model it for you) to derive the correct phase and
magnitudes for the feeders.
www.arraysolutions.com
Array Solutions Four Square Controller
Array Solutions
350 Gloria Rd.
Sunnyvale, TX 75182
5
st
position - or
Ofc: 972 203 2008
Fax: 972 203 8811