L-TRX/L-19F
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11.2.1
Function Description
The architecture of the L-TRX / L-19F units is significantly different to the design of the former
L-TX and L-RX units. The individual signal processing and amplifier control stages are as
much as possible shifted into the digital domain.
Signal processing
The transmitter consists of a direct digital synthesizer. The output power range is fully
implemented with D/A-converters, which eliminates the need of real-time controlled analog
attenuators.
The receiver consists of a mostly direct digital system. The receiver gain is mainly
implemented in the digital section.
Deuterium Power Amplifier with Active Quiescent Current Control
The operating point of the on-board 5W power amplifier for 2H gradient shimming is matched
to the different operating modes in order to reduce power dissipation. The individual
quiescent current values are stored in the calibration data memory of each unit. In
2H Lock
mode the quiescent current is actively regulated.
Gradient Shimming
Together with the L-19F unit, the on-board 5W power amplifier should not be used for
gradient shimming on 2H. In spectrometer configurations with the L-19F unit a high power 2H
amplifier is anyway mandatory for 2H observe experiments. In this configuration the same
high power 2H amplifier is used for gradient shimming.
The L-TRX / L-19F units do not support gradient shimming on 19F.
Reference Clock
The L-TRX / L-19F units requires a reference frequency mixture produced by the AV4
REFERENCE board. The former 10 MHz system clock is not required anymore.
SSRB Communication Interface with ELCB
The L-TRX / L-19F units use a dedicated SSRB (Synchronous Serial Rack Bus) interface for
control and data transfer to the ELCB.
Real-Time Pulses via Backplane
The L-TRX is able to receive and transmit real-time control pulses via backplane to reduce
external wiring. This feature is currently only used in the NanoBay console (BLNKTR_2H~).
Other pulses and/or consoles may follow in the future.
2H-TR Power Amplifier Output Connector
The output connector is a N-type instead of SMA to avoid the risk of unintentional wrong
wiring. E.g. low power RF-boards could be permanently damaged if wrongfully connected to
the 5W power output of the L-TRX.
Summary of Contents for NMR AV4 BSMS System
Page 1: ...BSMS System for AVANCE NEO User Manual Version 001 Innovation with Integrity NMR...
Page 10: ...Contents x H172203_1_001...
Page 22: ...Safety 22 234 H172203_1_001...
Page 26: ...Transport Packaging and Storage 26 234 H172203_1_001...
Page 42: ...Chassis Mainframe 42 234 H172203_1_001...
Page 46: ...Fan Tray 46 234 H172203_1_001...
Page 55: ...ELCB H172203_1_001 55 234 Figure 8 1 ELCB Front Panel with LED s and Connectors...
Page 69: ...ELCB H172203_1_001 69 234 Figure 8 13 Lock RF Boards Diagnostics...
Page 70: ...ELCB 70 234 H172203_1_001...
Page 120: ...L TRX L 19F 120 234 H172203_1_001...
Page 148: ...BSVT Concept 148 234 H172203_1_001...
Page 166: ...SPB 166 234 H172203_1_001...
Page 172: ...VPSB DC and VPSB DC E 172 234 H172203_1_001 Figure 15 3 Block Diagram of the VPSB DC E...
Page 180: ...VPSB DC and VPSB DC E 180 234 H172203_1_001...
Page 187: ...VTA H172203_1_001 187 234 Figure 16 1 VTA Cable Connectors...
Page 193: ...VTA H172203_1_001 193 234 16 7 Ordering Information See Basic BSVT Configuration 124...
Page 194: ...VTA 194 234 H172203_1_001...
Page 200: ...Nitrogen Level Sensor 200 234 H172203_1_001...
Page 204: ...Radiation Shield Temperature Monitoring MAG RS 204 234 H172203_1_001...
Page 208: ...Installation and Initial Commissioning 208 234 H172203_1_001...
Page 210: ...Operation 210 234 H172203_1_001...
Page 216: ...Replacement of Parts 216 234 H172203_1_001...
Page 222: ...Contact 222 234 H172203_1_001...
Page 226: ...List of Figures 226 234 H172203_1_001...
Page 229: ...Glossary H172203_1_001 229 234 Glossary...
Page 230: ...Glossary 230 234 H172203_1_001...
Page 232: ...Index 232 234 H172203_1_001...
Page 233: ...H172203_1_001 233 234...
Page 234: ...Bruker Corporation info bruker com www bruker com Order No H172203...