Pulsar TC-10B, User Manual

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LEDs for indicating Keying condition
• High-Level (10W), Red (D10)
• Low-Level (1W), Red (D11)
• Voice (4.3W), Red (D12)
10.1.2 Keying PC Board Jumper
Controls
(The Keying PC Board jumper controls are shown
in Figure 10-2.)
JU1 Carrier Start 15V, 48V, 125V, 250V
JU2 Carrier Stop 15V, 48V, 125V, 250V
JU3 Low-Level 15V, 48V, 125V, 250V
Key
JU7 Carrier Start/Stop Priority
JU6 Carrier Start NORM, INVERT
JU5 Carrier Stop NORM, INVERT
JU4 Low-Level NORM, INVERT
Test
JU8 Carrier Stop (KA-4, SKBU-1)
10.2 Keying Circuit Description
The Keying Module (see Figure 10-3) provides an
optically-isolated interface between the carrier
and the relay system and controls the operation of
the Transmitter Module with the following
customer inputs:
• Carrier Start (High-Level Test)
• Carrier Stop
• Low-Level Test
• Optional Checkback Test at High-Level
• Optional Checkback Test at Low-Level
• Optional Voice
Keying Module outputs are as follows:
• High-Level (10W)
• Any Transmitter Key
• Voice (4.3W)
The logic blocks used are as follows:
• “AND” gate
• “OR” gate
• “Exclusive OR” gate
• “Inverter”
Logic “1” is +18.6Vdc. Logic “0” is +3.6Vdc. The
following truth tables describe the operation of the
building blocks.
AND INPUTS OUTPUTS
A B Y
0 0 0
0 1 0
1 0 0
1 1 1
OR INPUTS OUTPUTS
A B Y
0 0 0
1 0 1
0 1 1
1 1 1
Exclusive OR INPUTS OUTPUTS
A B Y
0 0 0
0 1 1
1 0 1
1 1 0
INVERTER INPUTS OUTPUTS
1 0
0 1
Customer inputs operate as follows:
Carrier Start
When jumper JU6 is in the NORM position,
carrier start will be initiated when the proper
voltage level (15V, 48V, 125V, or 250V) is
applied to pins A-10/C-10. When JU6 is in the
INVERT position, carrier start will be
initiated when voltage is removed from the
input A/C-10.
Page 10–2 October 2003
TC–10B System Manual
Technologies, Inc.