Circuit servo motor tester for antenna


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

That circuit is to test the motor servant of the parabolic antenna it is working perfectly, although a system with LNB is much more appropriate, numerous 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 motor. 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.

Description of the circuit of the servo motor test of parabolic

The servo motor tester consists of a a stable multi-vibrator that determines the direction of turn off 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 a 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.

Schematic diagram of the servant’s circuit tester of parabolic

Suggestion of printed circuit board 1 scale 1:1

Suggestion of printed circuit board 2 for assembly of the circuit zoom 200%

Plate side of the components orientation of the assembly

It lists of components for assembly of the circuit


C1 220nF
C2 220nF
C3 470nF
D1 1N4148
IC1 NE555
R1 120k
R2 3.3k
R3 4.7k
R4 4.7k
S1 Key league turns off

Recommendation: If your system of parabolic antenna still uses servant motors, I recommend that you change for lnbf and tell good-bye the headaches that the parabolic with remote control. In the Internet is possible to buy a lnbf monopont for $ 18,00.

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About the author blog author. Electronics technician for the technical school of Brasilia - Brazil. Interested in electronics, circuits and technology in general.

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