Antenna angle indicators. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Antennas. Technology
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If you do not have selsyns, the problem can be solved by simpler means that provide quite acceptable results. On fig. 1 shows a rotation angle indicator based on a balanced resistance bridge. R1, R4 - wire. Since most variable resistances have an angle of rotation around their axis other than 360°, it is necessary to make a transmission unit so that the rotation of the antennas by 360° corresponds to the full rotation of the axis of the variable resistance R1 - from limit to limit.
Ris.1
In my case, the variable resistance had a full turn of 330 degrees, a transmission unit was made with a ratio of 1: 1,09. The resistance values do not matter, it is only important that the condition R1=R4 is observed. R2, R3 serve to eliminate the influence of the active resistance of the cable (wire) connecting R1 to the circuit. R5 is set to the "middle position, it can be replaced by two constant resistances of the same value. The measuring head PA is a 50 μA microammeter with zero in the middle of the scale. The current consumed by the circuit is 0,5 mA.
- Calibration:
A) set the antenna to 0 °, adjust R4 to zero RA readings. We put the value 4 ° on the scale combined with R0.
B) We set the antenna to 360 °, we also adjust R4, we mark 360 ° on the scale. It remains to linearly calibrate the scale - and you can get to work.
Schedule: to detect the angle of rotation of the antenna, adjust R4 through the simplest vernier to zero readings of the head. If you need to install the antenna in some direction, then R4, associated with a graduated scale, set the required azimuth. The direction of rotation is chosen so that the arrow PA tends to zero, upon reaching which it can be considered that the antenna is set to the required angle. Limit switches 0 and 360° are installed on the antenna mast, upon reaching which the polarity of the motor power supply changes and the antenna begins to turn in the opposite direction.
2) If there is no head with a zero center, it is possible, on the basis of the same circuit, to construct a less accurate device, where the scale of a conventional type microamperemeter graduated from 0 to 360 ° is used as a scale. To do this, R4 is shorted, the diodes D1, D2 are removed for greater linearity, and R6 is increased by another 20 kOhm (this is when using a head with a full deflection current of 50 μA). If there is a less sensitive head, then R6 is selected. Now the zero reading of the device corresponds to 0°, and the maximum - 360°.
Author: A. Sizov (UA2FTX); Publication: N. Bolshakov, rf.atnn.ru
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