Smiths Kelvin Hughes Nucleus 3 5000 Series, System Handbook

Page: 338 / 510

IN TRO DUC TION
1 The MkVI Transceiver is available in an Upmast
configuration, where the transceiver electronics are
incorporated in the turning mechanism (see Figure1c ,
below). Two versions are available:
(1) Low Speed - 25 rpm.
(2) High Speed - 40 rpm.
2 A Soft Start Unit, which is required for both versions of
the transceiver, switches three phase mains to the
antenna motor. A thermal overload trip unit, mounted in the
soft start unit, protects the supply to the motor. Access to the
trip unit reset button is achieved by removing the soft start
unit front cover. The soft start unit can also be fitted with an
in-line single phase mains supply, for installations with long
cable runs, or installations which are interswitched.
Original 7c.1 May 01
KH 2020
Chap 7c
CHAPTER 7C
MKVI TRANSMITTER/RECEIVER & ANTENNA
HEATSINK
HEATSINK
HEATSINK
MAGNETRON
LOC.5
RF HEAD
CIRCULATOR
LIMITER MIXER
L.N.F.E.
LOC. 5
TUNE SUPPLY
PCB
CTX-A250
LOC. 6
RX
MONITOR
LOC. 8
NOISE
DIODE
RECEIVER
LOC. 7
1 TB
VIDEO O/P
SYNC. O/P
PART OF
38 CORE CABLE
S-BAND ANTENNA Mk2
CAE-A36 OR CAE-A39
TX. MON NEON
GEARBOX
ROTATING JOINT
AZ/HL PCB
LOC 9
220/440V
MOTOR
TERMS
(NOT USED EXT. TRIG. IN)
(NOT USED PRE. PULSE O/P)
NOT USED
FAN
CTX-A246
CONTROL CIRCUITS
Tx MON DETECTOR &
POWER SUPPLY/SIGNAL
DISTRIBUTION PANEL
LOC.3
CTX-A248
MODULATOR &
POWER SUPPLY
HV MON SUPPLY
LOC. 4
RF HEAD
LOC. 5
PART OF CAE-A38 OPTIONAL
TRANSCEIVER CAE-A37 CAE-A45
LOC. 1
P
L
A
P
L
A
P
L
B
P
L
B
P
L
B
4mm
P
L
D
P
L
C
P
L
M
P
L
B
P
L
H
P
L
G
PLK
PLD PLF
P
L
A
BRAID
3mm
P
L
C
T
P
's
TP's
PLA
PLA
PLC
PLB
PLA
PLJ
PLJ PLE
P
L
C
CD-3803
P
L
A
HEATSINK
PSU CAE-A202
LOC. 2
EXTERNAL
SAFETY SWITCH
LOC.1
P
L
C
P
L
A
PLB
3 CORE POWER CABLE L
MONITOR ARM PART OF
CAE-A38 (OPTIONAL) LOC. 11
2 CORE CABLE A
CONTACTOR
MOTOR
PROTECTION &
ISOLATION SWITCH
AERIAL
START
LOC 10
SOFT
START
LOC 10
3 PHASE MAINS IN
FROM ISOLATOR
SOFT START UNIT CZZ-A14/2
TB3
TB1
DELAY
LOC 1
INLINE
PSU
1 PHASE MAINS FROM
DISPLAY/INTERSWITCH
38 CORE FROM DISPLAY
OR INTERSWITCH UNIT
L
N
E
TB5,6 TB2 TB4
CABLE M
Figure 1c - Upmast Transceiver: Block Diagram