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NGT—Technical description (2010)
Supply voltages
Handset
The supply voltages for the handset are shown in
Drawing
Table 18: Supply voltages for the Handset PCB in the handset
Supply
Standby
Handset power
+5 V
–9 V
Junction box
The supply voltages for the junction box are shown in
Drawing 04-03201, or
ALTERNATIVE TEXT
Drawing
Table 19: Supply voltages for the Audio PCB in the junction box (04-03201 or
04-03423)
Supply
A (protected)
+10 V
+5 V
+5 VQ
Drawing
Table 20: Supply voltages for the Microprocessor PCB in the junction box
Supply
+5 V
A (protected)
72
04-03125
Description
+5.4 V when transceiver is off ext from junction box
+9.2 V when transceiver is on ext from junction box
+5 V regulated supply
–9 V for IC7
04-03423
Description
Unregulated battery supply
+10 V regulated supply
+5 V regulated supply
+5 V quiet for opamp bias
04-03133
Description
+5 V digital supply
Unregulated battery supply
Table
18.
Source
IC10
IC5
Table 19
and
Table
Source
ext from RF unit
IC12
IC13
IC13 (filtered)
Source
IC13
from RF unit
NGT Transceiver System Technical Service Manual
20.
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