ELETTRONICA
PJ20KPS-C/PJ25KPS-C
User & Technical Manual
Rev. 1.2 23/07/2012
24
5.3 Phase ADJ
It ‘a resonant circuit “LC” with variable capacitors on the back of front panel (Figure 5-17).
The purpose of this circuit is to attenuate the power to the dummy load connected to the
transmitter, by varying the phase of the input signal to each machine 10 Kw.
The calibration of this circuit is made in testing phase, but the working conditions with
the connection of the transmitter antenna may require a revision, in this case proceed as
follows:
The procedure is repeated by placing first in the wave exciter exciters 1 and then 2 or
vice versa.
EXCITER 1
1) Insert the screwdriver into the hole in 1 ° and rotate 180 degrees clockwise (Pull out
the screwdriver) and check the value of the power “Unbalanced” in the service menu
(note: the contact of the screwdriver to the circuit “LC” to bring information out of the
norm , then the readings will be effetuate screwdriver extract)
2) If we obtained a decrease in the value of unbalanced power, switch to the second ca-
pacitor at the 2 ° hole and also rotate 180 ° in a clockwise direction.
3) If the operations carried out in step 1 and 2 are still not sufficient to pass to the capaci
-
tors of TX2 (3 ° and 4 ° hole), but this time the rotations of the capacitors will need to be
in the opposite direction to the previous ones that is in anti-clockwise.
4) If the operation described in step 1 results in an increase of power unbalanced instead
of a decrease in the condenser rotate through 360 ° in an anticlockwise direction (180 °
to bring it back to the starting con 180 ° to correct the phase and proceed with the
subsequent points.
Caution:
in this case the operation described in step 3 will provide for a rotation of the
capacitors in a clockwise direction (as the second pair of capacitors must move in the
opposite direction to the first).
Repeat the above operation for EXCITER 2.
Exciter 1
Exciter 2
TX1
TX1
TX2
TX2
1°
4°
3°
2°
Hole n°
Hole n° 1°
4°
3°
2°
Figure 5-17
Содержание PJ20KPS-C
Страница 1: ...PJ20KPS C PJ25KPS C User Technical Manual...
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