Array Solutions Four Square Gebruikershandleiding - Pagina 3
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Figure 2.
Figure 2 description:
(Please also refer to the schematic received with your System)
J1 Feed line RF connector is where your 50 ohm feed line connects.
The area marked HV capacitor bank – C1 is for placement of HV RF capacitors in parallel with
the vacuum cap. This is the input L network. It is used to match the system to a perfect 1:1
VSWR. Adjust the matching network for the characteristics of your antennas by adding or
removing capacitors, adjusting the vacuum cap, and moving the tap on the coil L1.
Input Match L1 and C1, L-network: Two coil taps, one for 4-square operation and one for omni
operation. Coil taps and capacitors may need slight adjustments for your antennas.
J2 and J3, Delay Phase Line In and Out: These are the two connectors for the 180 degree
phase line. It creates the 180 degree phase delay to the front element of the array.
Antenna Ports J4 to J7: These are the output connectors to the 4 antennas. Each one should
have a ¼ wavelength feed line connected to it. ¼ wavelengths take advantage of the current
forcing properties of this length of transmission line. They can be 50 or 75 ohms.(See note on
next page.)
L2, C2 - 90-120 degree phase shifter: This is the L-network that will cause the required phase
delay to the center elements with respect to the rear element. Adjust it for correct phase and
magnitude.
L3, C3 - 180-240 degree phase line phase shifter LC: This network allows you to use a phase
delay to the front element that is greater than 180 degrees, which is accomplished by the 180
degree delay (phasing) line. You will adjust it for phase -224 degrees, and magnitude.
Control Terminals: Attach the control cable to this terminal strip. It is marked as in the schematic
2, 3, 4, 5, OMNI, and ground. (No connections to #5.)
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