Array Solutions Four Square Посібник користувача - Сторінка 7

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Array Solutions Four Square Controller

C3 and L3 comprise the -224 degree network. They take the signal from the 180 degree delay

line and add additional delay along with the ability to adjust the magnitude of the waveform.

Adjust this waveform for the delay and magnitude your model required or approximately as

below. The delayed signal is approx .8 the magnitude of the Channel A reference 0 degree

signal. See Figure 4 below.

Figure 4: -224 degree delay

Now go back and adjust the -111 degree signal, and verify the -224 degree signal has not

changed. Go back and forth until you have the correct phase and magnitudes that your model

requires.

Finally adjust the input VSWR L network L1 and C1 for a 1:1 VSWR

You should be able to tweak it in very well with the vacuum cap and coil tap and achieve a very

low VSWR.

Turn the array by switching the directions with your controller and verify VSWR is relatively

stable. It may vary somewhat. Also re-check the scope patterns, as they should remain the same

but will vary and change output connectors as you steer the array in different directions. Due to

mutual coupling differences the patterns on the scope and VSWR may a small amount. If you see

a large variation there is something wrong. Check all feedlines to your array as well as all the

functions you expect from the schematic. Of course call us with any difficulties.

Now, Tune the Omni Mode tap.

Select the Omni Mode with your controller, and observe the SWR. Tune the ONMI foil tap on the

L-Network coil. You may not be able to achieve a perfect 1.0:1 VSWR in omni mode but it should

be under 1.5:1. This is because the capacitance has been set by the normal 4 square operation,

and is slightly less then desirable. But this should not be an issue in operation.

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Array Solutions

Ofc: 972 203 2008

350 Gloria Rd.

Fax: 972 203 8811

Sunnyvale, TX 75182