Pulsar TC-10B, User Manual

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Copyright © 2003 Pulsar Technologies, Inc.
Chapter 17. Optional Voice Adapter Module
17
Schematic C030-VADMN
Parts List C040-VADMN
17.1 Voice Adapter Module
Description
The Voice Adapter Module provides voice
communications between terminals of the TC-10B
and TCF-10B carrier systems. You can use the
same module in either type of system simply by
changing the DIP switch settings (see the "Voice
Adapter Module Settings" section later in this
chapter). This chapter describes the module's use
in TC-10B carrier systems.
The Voice Adapter Module also provides
signaling, which includes an on-board audible
alarm and LED to indicate incoming calls. For the
TC-10B, voice communication is in half-duplex
mode. That is, you can talk and listen, but not at
the same time (like a two-way radio). This is
because, in a TC-10B system, the module
transmits and receives on the same frequency.
17.1.1 TC-10B Operation (Half-
Duplex)
Figure 17-1 provides a simplified look at how the
Voice Adapter Module operates when used in a
TC-10B carrier system. It works like this:
Receive Direction
1. The Universal Receiver Module in the TC-
10B system outputs an audio signal to the
Voice Adapter Module.
2. The Voice Adapter Module filters the audio
signal and runs it through an expandor.
3. The Voice Adapter Module then amplifies
the audio signal and sends it to the handset.
(You can adjust the receive audio level by
turning the RECEIVE AUDIO poten-
tiometer on the module's front panel.)
Transmit Direction
1. The Voice Adapter Module filters the audio
signal coming from the handset and runs it
through a compressor.
2. The Voice Adapter Module then amplifies
the audio signal and sends it to the Keying
Module.
17.1.2 Handset Operation
You can connect the handset (with a push-to-talk
switch) to the TC-10B in the following ways:
Figure 17-1. Voice Adapter Module — Simplified Signal Flow Diagram.
Style Number Description
Table 17–1. Optional Voice Adapter Style and Description.
C020-VADMN-001 Optional Voice Adapter Module