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PAGE 4
User manual PS 155 / Issue 2011 © ASL Intercom BV
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5.0
FRONT PANEL CONTROLS
1
RECEIVE volume knob
This knob is for adjusting the level of the audio
that is received from the wireless unit
2
SEND volume knob
This knob is for adjusting the level of the audio
that is sent to the wireless unit
3
SIDE TONE LOW trimmer
4
SIDE TONE HIGH trimmer
5
SIDE TONE LEVEL trimmer
Trimmers 3, 4 and 5 are for adjusting the rejection
of the side tone; the LEVEL trimmer for the whole
audio spectrum, the HIGH trimmer for fine tuning
the high frequencies and the LOW trimmer for fine
tuning the low frequencies. See section 9.0
6
TEST TONE button
By pushing this recessed button the built-in test
tone generator is activated. The test tone assists
in obtaining the best possible side tone rejection.
See section 9.0
7
VOX LEVEL trimmer
This trimmer adjusts the detection level of the
VOX switch. As soon as the VOX circuitry detects
an audio signal on the intercom party line that is
louder than the level set by this trimmer, the
wireless unit goes from receive mode to transmit
mode. See section 10.0 for the VOX adjustment
procedure.
8
VOX RELEASE trimmer
After the audio signal of the intercom party line
falls below the set VOX level, the wireless unit
stays in transmit mode for a period of time that is
preset by this trimmer. See section 10.0 for the
VOX adjustment procedure.
9
TX CONTROL select switch
This switch has the positions VOX, CALL and
PTT, each indicating the way the wireless unit is
triggered to go from receive mode to transmit
mode. See section 7.0
10
POWER LED
This LED is lit when the PS 155 is powered by the
intercom line.
11
Rx/Tx LED
This LED is lit green when the wireless unit is in
receive mode and lit red when the wireless unit is
in transmit mode. See also section 7.0.
