Block Diagram - Rohde & Schwarz CRTU-RU Service Manual

Instrument Design and Function Description

Block diagram

MAINS
ADC ADC
DDC Mod. DDC Mod.
AUC
AUC TX DSP TX DSP
IF-RX DISTRIBUTION
IF-TX DISTRIBUTION
IF3 13.85MHZ
LO3
RX
IF3 10.7MHZ
IF3RX1
IF3 13.85MHZ
LO3
RX
IF3 10.7MHZ
FRONTMODULE
FRONT MODULE CONTROLER
LC DISPLAY
Fig. 3-1 Block diagram of CRTU Radio Unit
1140.0050.82
POWER SUPPLY
M A C SPE EC H
C R T U -B 6
LINKHANDLER1
CRTU-B5
DIGITAL BOARD
VAR 03
CLOCK DISTRIBUTION
LINKHANDLER 2
CRTU-B5
IQ/IF INTERFACE BOARD
CRTU-B7
IF <-> IQ CONVERSION
RXTX BOARD 2
IF1 842.08MHz
IF2 487.52MHZ
LO3
/1817.12 MHZ
TX
LO2 LO1 RX
IF1 843.085MHz
IF2 486.515MHZ
/1816.115 MHZ
TR-CORRECTION
MODULE
RXTX BOARD 1
IF1 842.08MHz
IF2 487.52MHZ
LO3
/1817.12 MHZ
TX
LO2 LO1 RX
IF1 843.085MHz
IF2 486.515MHZ
/1816.115 MHZ
TR-CORRECTION
MODULE
HARDDISK
VAR/KEYBOARD
Radio Unit R&S
Option
Sandwich
Module
MOTHERBOARD
N E T C L K 2
2 1 to 8 4 M H z
N E T C L K 1
2 1 to 8 4 M H z
1 1 0 . 8 M 3
1 1 0 . 8 M 2
1 1 0 . 8 M 1
Attenuator
RFTX2
LO1 TX
Attenuator
RFRX2
RFRX1
Attenuator
RFTX1
LO1 TX
Attenuator
RFRX1
3.2
CRTU-RU
INTERFACES
O C X O
R E F E R E N C E
O S C .
C R T U - B 2
OCXO
R5
REFERENCE BOARD
D IV
3
X T A L
1 1 0 . 8
M H z
+5VR EF T C X O
1 0 M H z
R120 R121
INTERFACES
R F - S p li tte r
E-4