doc
Differences
This shows you the differences between two versions of the page.
Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
doc [2019/03/29 12:07] – [USRPs] lcardoso | doc [2023/11/27 11:58] (current) – [Node position map] lcardoso | ||
---|---|---|---|
Line 19: | Line 19: | ||
===== Node position map ===== | ===== Node position map ===== | ||
- | + | {{:node_positions_new.png?700|}} | |
- | {{:node_positions.png?700|}} | + | |
(Click on the image for a higher resolution picture) | (Click on the image for a higher resolution picture) | ||
Line 37: | Line 36: | ||
# USRPs | # USRPs | ||
- | All 21 USRPs installed in the FIT/ | + | There 26 USRPs installed in the FIT/ |
- | * Frequency range: 400 MHz to 4.4 GHz | + | * 22 are of type NI-2932 (equivalent USRP N210 with a SBX daughterboard). Here are the main characteristics of these (for more details refer to the [[http:// |
- | * Maximum bandwidth: 20 MHz (but in practice less than 20 MHz are usable without loss of samples due to either the gigabit ethernet connectivity or the computing power of the signal processing computer) | + | |
- | * Full-duplex TX and RX chains. There are antennas connected to the '' | + | * One Gigabit/s ethernet attachment to control node |
- | * Synchronization: | + | |
+ | * Full-duplex TX and RX chains. There are antennas connected to the '' | ||
+ | * Synchronization: | ||
+ | * 4 are of type N2944R (equivalent of X310). | ||
+ | * Frequency range: 10 MHz to 6 GHz | ||
+ | * Dual 10 Gigabit/s ethernet attachment to control node | ||
+ | * Maximum bandwidth: 160 MHz (theorically, | ||
+ | | ||
- | For more details refer to the [[http:// | + | Find here tutorials on [how to use them](experiment_usrp) |
- | + | ||
- | Find here tutorials on [how to use it](experiment_usrp) | + | |
# Octoclocks | # Octoclocks | ||
+ | A hierarchy of octoclocks allow the reference and timing distribution to all USRPs in CorteXlab. All cables are of same length (5m between master and slave octoclocks and 10m between slave octoclocks and USRPs). The connection layout is as shown below. The octoclock 0 is the master and the octoclocks 1-4 are the slave ones. | ||
+ | |||
+ | {{:: | ||
+ | |||
+ | ==== Timing measurements in the CorteXlab room: ==== | ||
+ | |||
+ | |||
+ | The octoclock produces a PPS signal that has a period of 1s and remains high during 200ms and low 800ms as shown below: | ||
+ | |||
+ | {{:: | ||
+ | |||
+ | The PPS signals between the slave octoclocks in the room are mismatched by a maximum of 800ps as shown below (examples): | ||
+ | |||
+ | {{:: | ||
+ | |||
+ | Between nodes 28 (connected to octoclock 3) and 31 (connected to octoclock 4) | ||
+ | |||
+ | {{:: | ||
+ | |||
+ | Between nodes 31 (connected to octoclock 4) and 14 (connected to octoclock 2) | ||
+ | |||
+ | {{:: | ||
+ | |||
+ | Between nodes 14 (connected to octoclock 2) and 10 (connected to octoclock 1) | ||
+ | |||
+ | {{:: | ||
+ | |||
+ | Between nodes 10 (connected to octoclock 1) and 27 (connected to octoclock 3) | ||
+ | |||
+ | For more (updated) info on the octoclocks: | ||
+ | |||
+ | [[https:// | ||
+ | |||
+ | [[https:// | ||
# PicoSDRs | # PicoSDRs | ||
* [how to use it](experiment_picosdr) | * [how to use it](experiment_picosdr) |
doc.1553857648.txt.gz · Last modified: 2019/03/29 12:07 by lcardoso