Radiosystem RS 923 Communications Service Monitor
Fabricant:
Modèle:
RS 923
Date:
1983
Catégorie:
Groupe:
Description:
Line Monitor

Information

The purpose of the line monitoring unit is to provide modulating AF and a means of listening in on the lines from and to the MTX at line level settings. The unit contains an 1 kHz tone generator and a two-input audio Amplifier with a loudspeaker. The unit is connected to the line connectors on the front panel of the channel units. Three separate cables can be used, all of them connected to the same connector on the monitoring unit. The use of the three pairs of sockets is indicated by white lines to the level setting potentiometers. The audio Amplifier consists of separate, differential line Amplifier stages Q2 with balanced, high impedance inputs and a common driver stage Q1 for the loudspeaker. The audio levels can be set individually with potentiometers R22 and R23- The input stages are protected against high transients on the lines by diodes connected to the +24 V supply and ground. The audio Oscillator consists of an oscillating circuit with two operational amplifiers Q2, and an Amplifier stage Q1 with a 600 ohms transformer output. The audio level is regulated by potentiometer R21. The Power Supply is the nominal +24 V paralleled supply. Power on is indicated by LED Dll.

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Schéma cirquit
Type manuel:
Schéma cirquit
Pages:
7
Taille:
3.02 Mbytes (3165692 Bytes)
Langue:
english
Révision:
Manuel-ID:
Date:
01 janvier 1983
Qualité:
Document scanné, la lecture en partie mal, en partie illisible.
Date de transfert:
04 octobre 2016
MD5:
e59fbf7bc0b3b63257957729ff74779d
Téléchargements:
394

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