Pulsar TCF-10B, Системное руководство, Страница: 217 / 249

18.2 Voice Adapter Panel
Controls
18.2.1 Voice Adapter Control Panel
(This panel is shown in Figure 1-1.)
Operator controls are provided as follows:
Calling Pushbutton (“Calling PB”)
Used with TCF–10B only to activate signaling
oscillator.
Alarm/Alarm-Cutoff LED
(“Alarm/Alarm Cutoff”)
Indicates when Alarm/Alarm Cutoff relay is
activated.
Receive Audio Level Adjustment
(“Receive Audio”, R24)
Adjusts the receive audio level.
Microphone Sensitivity Adjustment
(“Mic. Sens”, R63)
Sets the audio level output to the modulator.
Handset Jack (“Handset”, TJ1)
(The handset schematic is shown in Figure 18-8.)
18.2.2 Voice Terminal Block on Rear
Panel
(This panel is shown in Figure 3-1.)
Connections are as follows:
• Common
• Signaling input (external calling switch, to
be returned to common when signaling).
• Alarm Cutoff signal (2 contacts: NO or
NC).
• External receiver output.
• External microphone input.
18.3 Voice Adapter PC Board
(This board is shown in Figure 18-1.)
Operator controls are provided, as follows:
JU1 Receiver Squelch (IN/OUT). When
the jumper is “IN”, voice keying
squelches the receive audio signal.
JU2/
JU3
Compandor (IN/OUT) When the
jumper is “IN”, the audio is compan-
dored; when the jumper is “OUT”, the
audio is not compandored. We
generally recommend that you use
companding, as it improves the signal-
to-noise performance.
JU4 Signaling (TC/TCF) When jumper is
set for “TC”, and handset is plugged
into handset jack, the alarm cutoff
from the handset jack will cause the
relay to operate. When jumper is set
for “TCF”, the presence of a signaling
tone will operate the relay.
JU5 Alarm Contacts (NO/NC) When
jumper is set in “NO” position, and
relay is de-energized, the alarm
contacts will be “OPEN”.
When jumper is in “NC” position, and
relay is de-energized, the alarm
contacts will be “CLOSED”.
April 1997 Page 18–3
Chapter 18. Optional Voice Adapter Module
18