Radio Unit R&S
CRTU-RU
Instrument Design and Function Description
1140.0050.82 3.9
E-4
Option OCXO REFERENCE OSC. CRTU-B2
This option consists of a printed circuit board with the reference element OCXO (oven-controlled crystal
oscillator), the control circuit and a potentiometer for adjusting the OCXO.
Installation
The option OCXO REFERENCE OSC. is installed on the right side
below the instrument fan such that the potentiometer is easily
accessible from outside without the need for opening the CRTU Radio
Unit tube.
Connection
The option OCXO is directly inserted via a 10-pin connector on the
MOTHERBOARD and screwed to the module support by means of
three screws.
RF FRONTEND
Design
The printed circuit board of the RF FRONTEND is installed in a silver-
coated aluminum casing which is screwed to the instrument frame. The
RF FRONTEND is fitted at the right front of the CRTU Radio Unit such
that the four RF N-type connectors which are directly connected to the
FRONTEND board are accessible on the front of the instrument frame
of the CRTU Radio Unit. This is absolutely necessary to ensure a good
VSWR (Voltage Standing Wave Ratio).
Cooling system
The aluminum casing in which the RF FRONTEND is installed is
equipped with cooling fins in a special cooling duct and an extra
temperature-controlled fan for heat dissipation if high RX power is fed
in.
Control and supply
Control and supply of the RF FRONTEND are effected from
MOTHERBOARD1 via a 34-pin ribbon cable.
RF connectors
For the internal RF connection to the RXTX BOARD1 (RFRX1,
RFTX1) two SMA screw connections and coaxial solid-jacket cables
are used. Thus a high-quality RF connection is ensured.
Besides, two further internal RF connections (RFRX2, RFTX2) to the
optional RXTX BOARD2 are available.
Two bidirectional monitor inputs/outputs (RFRXTXAUX1/2) at the RF
FRONTEND permit to connect further RF devices via optional cables
leading to the integrated rear panel of the CRTU Radio Unit.
As external RF interface, the RF FRONTEND is equipped with the four
N-type connectors RF1, RF2, RF3OUT, RF4IN, which permit to
perform all the RF measurements of the CRTU Radio Unit.
RF1 and RF2 are bidirectional inputs/outputs depending on the setting
and measurement application.
RF3OUT is a unidirectional output.
RF4IN is a unidirectional input.
Optical indication
For optical indication of the selected N-connectors and input and/or
output functions, yellow LEDs located above the N-connectors are
switched on.
Functions
On the transmitter side (TX), the RF FRONTEND serves the purpose
of distributing internal RF signals to the outside to the various N-
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