LOG RE CEIVER CTX- A297
13
A block diagram of the Log Receiver CTX-A297 is
shown in Figure 4a, below.
14
The Receiver comprises a logarithmic IF amplifier,
Automatic Frequency Control (AFC) circuitry and
tuning indicator circuitry.
Original
7a.3
May 01
KH 2020
Chap 7a
BRIDGE RECTIFIER
SMOOTHING CHOKE L4
CAPACITORS C63, C64,
VOLTAGE SENSE
VOLTAGE
REGULATOR
D73, R145
R144
POWER
TRANSFORMER T1
20V IN
400V OUT
POWER
SWITCHES
MAIN SCR
CSR2
MAGNETRON
PULSE
TRANSFORMER T3
OVERSWING
RESISTOR
R125
OVERSWING
DIODES & PEN
COMPENSATING
DIODES
RFI FILTER
RFI FILTER
CHARGE SCR CSR1
CHOKE L4
BLOCKING DIODE D53
HOLD-OFF
REACTOR SL1
PFN RELAYS
& TAILBITER
Tx MON
CTX-A199
CURRENT LIMIT
VOLTAGE SENSE
STANDBY SHUTDOWN
CHARGING DELAY
MODULATOR TRIGGER
DISCHARGE
MP VOLTS
SP VOLTS
+27V
CD-2183
-330V
-150V
OPTION
HEATER
VOLTS
1
1
CHARGE
DELAY
AND
TRIGGER
IC8B, TR27
T5
Figure 3a - Modulator Block Diagram
I/P AMP &
BANDPASS
FILTER TR34
IC5
DISCRIMINATOR
5 STAGE
LOG AMP
IC6
SAMPLE
& HOLD
3 STAGE
LOG AMP
IC3 SUM
SELECTABLE
BANDPASS
FILTER
IC3 AMP
IC4
TUNE AMP
DETECTOR
TR33/TR37
LOWPASS
FILTER
IC2
VIDEO AMP
VIDEO
+14V
+14V
-14V
-14V
0V
BAND SELECT
LNFE TUNE
TUNE INDICATOR
I/F
I/F SCR.
TUNE
MOD SYNC.
VID.SCR.
3 x VIDEO
OUTPUT
CD-2184
Figure 4a - Log Receiver (CTX-A297) Block Diagram
Summary of Contents for Kelvin Hughes Nucleus 3 5000 Series
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