Pulsar TCF-10B, System Manual, Page: 91 / 249

7.1 Power Supply Module
Terminal Block (TB7)
TB7/1 Positive Vdc (also pins C/A-12)
TB7/2 Negative Vdc (also pins C/A-14)
The Vdc is received from three (3) available
groups of station batteries:
• 38–70 Vdc (48 or 60 Vdc nominal)
• 88–140 Vdc (110 or 125 Vdc nominal)
• 176–280 Vdc (220 or 250 Vdc nominal)
TB7/3 Failure Alarm Signal (also pins
C/A-16)
TB7/4 Failure Alarm Signal (also pins
C/A-18)
TB7/5 Spare
TB7/6 Chassis Ground
Voltage Output to All Other Modules
Positive voltage outputs (+20 Vdc) are
available at pins A-2 and A-4, while negative
voltage outputs (-20 Vdc) are available at pins
C-2 and C-4. Common to ground (pins C/A-
30 and C/A-32).
Optional low-voltage power alarm relay
outputs
Optional low-voltage power alarm relay
outputs are available at pins C/A-16 and
C/A-18.
7.2 Keying Module
Voltage Inputs
+20 Vdc Pins A-2 and A-4
-20 Vdc Pins C-2 and C-4
Common Pins C/A-30 and C/A-32
Terminal Block (TB4)
TB4/1 DTT (Direct Transfer Trip) Key (to
pin A-10)
TB4/2 DTT Return (to pin C-10)
TB4/3 52b or Pwr Boost (to pin C-16)
TB4/4 Pwr Off (to pin A-16)
TB4/5 UB (Unblock)/PC (Phase Com-
parison) Key (to pin A-22)
TB4/6 Key Common return for Power
Boost, Power Off, and UB/PC key
(to pin C-22)
Inputs
• External Voice Key (pins C/A-12)
• Optional Voice Key (pin C-24)
Outputs to Transmitter Module
• Shift Low (pin A-28)
• Shift High (pin A-26)
• High-Level 10W Key (pin A-8)
• Voice Key (pin A-6)
• Any Transmitter Key (pin C-6)
The following description of the TCF–10B signal path is in accordance with the Functional Block
Diagram (see Figure 7-1), and the rear panel previously shown (in Figure 3-1). The discussion of signal
path may be useful during Acceptance Testing (Chapter 5) or Routine Adjustment (Chapter 6).
Copyright © 1997 Pulsar Technologies, Inc.
Chapter 7. Signal Path
7