circuit to test servo motor (pole rotor) of parabolic antenna

Description: This circuit is designed to test the servo motor of a parabolic antenna. It functions effectively, although a system with a low-noise block feed (LNBF) is generally more suitable. Many users continue to utilize systems that employ an LNB and a servo motor. The purpose of this circuit is to assist technicians in repairing parabolic antennas by testing the operation of the servo motor. It helps identify defects related to polarization or the receiver. To use the circuit, it is sufficient to connect the wires to the power supply and select the type of polarization—vertical or horizontal—using switch S1. If the servo motor is functioning properly, a characteristic noise will be audible. The servo motor tester comprises an astable multivibrator that determines the motor's rotation direction. Typical pulse duration values are 1 millisecond (for vertical) and 2 milliseconds (for horizontal). When switch S1 is closed, the potentiometer R3 activates the circuit, and the 555 timer IC generates a signal with a duration of 1 millisecond. An adjustment in R4 may be necessary to achieve optimal circuit performance.

The circuit utilizes a 555 timer IC configured in astable mode to generate pulse signals that drive the servo motor. The astable multivibrator produces a continuous square wave output, which is essential for testing the motor's responsiveness to both vertical and horizontal polarizations. The switch S1 allows the user to select the desired polarization mode, impacting the pulse duration output. The use of resistors R3 and R4, along with capacitor C1, sets the frequency and duty cycle of the output signal, which can be fine-tuned for optimal performance.

When the circuit is powered, the 555 timer generates a pulse train that controls the servo motor's movement. The audible noise produced by the servo indicates that it is operational. If no sound is detected, this may suggest an issue with the motor or the associated circuitry. The design of the circuit emphasizes ease of use and quick diagnostics for technicians, facilitating efficient repairs of parabolic antennas. The integration of adjustable components allows for flexibility in testing various servo motors under different conditions, ensuring reliable operation and maintenance of antenna systems.That circuit is to test the motor servant of the parabolic antenna it is working perfectly, although a system with lnbf is much more appropriate, a lot of people they still use systems using lnb and servo motor. Then the idea of that circuit is to help to the technician reparation of parabolic antennas when doing test of operation of the servo mot

or. Being detected the defect is in the polarization or in the receiver. It is enough to connect the threads to tie the equipment in the electric outlet and to select with the key S1 the type of polarization vertical or horizontal, if the servo motor is with operation ok, you will hear the characteristic noise. The servo motor tester consists of a astable multi-vibrator that determines the direction of turn of the motor.

The typical values of duration of the pulses are 1 bad (V) and 2 bad (H). When the key S! it is closed the potentiometer R3 if I tan circuit and the c1 555 it generates a sign of 1mS of duration. he/she should do if an adjustment in R4 to get the best point of work of the circuit.