F800 CIRCUIT DESCRIPTION
17 (25)
Uppgjord (även faktaansvarig om annan) -
Prepared (also subject responsible if other)
Nr -
No.
KL/ECS/S/LT Magnus Lindahl ECS/S/LT-96:5044
Dokansv/Godk -
Doc respons/Approved
Kontr -
Checked
Datum -
Date
Rev File
KI/ECS/S/LTC 1996-06-06 A
965044.DOC
DC power supply
All external DC power is connected through the DC circuits on the radio board. The
CPU board controls the DC power distribution on the radio board. The incoming DC is
filtered and fused. There is also a transient protection on the DC input.
On the radio board the following voltages are used:
12V Supplied to the CPU board and to the TX power amplifier. 12V is present as long
as the radio unit is connected to the DC power source.
12VSW Switched 12V from a transistor switch controlled by the on signal from the
CPU board. The voltage is fused by a 4 A fuse.
10V Switched 10V delivered from a regulator on the radio board. The voltage is used
in the frequency generator. The regulator is supplied with 12VSW.
10VR Switched 10V delivered from a regulator on the radio board. The voltage is used
in the receiver. The regulator is supplied with 12VSW.
10VT Switched 10V delivered from a regulator on the radio board. The voltage is used
in the transmitter. The regulator is supplied with 12VSW.
5V Switched 5 V delivered from a regulator on the radio board. The voltage is used as
DC supply for the PLL circuit in the frequency generator. The regulator is supplied
with 12VSW.
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