Dataset Open Access

James Webb Space Telescope S-band recording with Allen Telescope Array (wideband excerpt)

Estévez, Daniel

This dataset contains a recording of the S-band telemetry downlink of James Webb Space Telescope. The recording was done on 2021-12-26, roughly one day after launch, using Allen Telescope Array antenna 2e in dual XY (linear) polarization.

The hardware configuration was as follows: antenna 2e was connected to RFCB LO d, which was tuned to a frequency of 2270.5 MHz and used an output IF of 512 MHz. A USRP N321 was connected to the IF output of the RFCB and digitized both polarizations. The USRP used external 10 MHz reference and PPS coming from the observatory distribution system. The IQ  sample rate of the USRP was 3.84 Msps and a GNU Radio flowgraph was used to record IQ data to disk.

The GNU Radio flowgraph stored the IQ data for each channel as 16-bin integers in the GNU Radio metatata file format, with detached headers. After recording, the data was converted to SigMF format. The recording lasts more than 4 hours, but only the first 25 minutes of data are included in the SigMF files to keep the total size of the dataset below 50 GB. Detached metadata files, with .hdr extension, contain the metadata for the full recording.

A version of this recording which contains the full length but is decimated to 320 ksps can be found in the dataset James Webb Space Telescope S-band recording with Allen Telescope Array (320 kHz bandwidth).

Files (46.1 GB)
Name Size
JWST_2021-12-26T07:13:56.865585_0x.hdr
md5:2acc25bb7d6f5e1ccf1463f8d9841f9c
3.9 MB Download
JWST_2021-12-26T07:13:56.865585_0x_excerpt.sigmf-data
md5:3e68b727277cc5e5e0b3518af4863961
23.0 GB Download
JWST_2021-12-26T07:13:56.865585_0x_excerpt.sigmf-meta
md5:592d13a0563d1c01a6d95673a2b2605f
913 Bytes Download
JWST_2021-12-26T07:13:56.865585_0y.hdr
md5:2acc25bb7d6f5e1ccf1463f8d9841f9c
3.9 MB Download
JWST_2021-12-26T07:13:56.865585_0y_excerpt.sigmf-data
md5:98777c5c0d8b66df3976153ab1fa6f05
23.0 GB Download
JWST_2021-12-26T07:13:56.865585_0y_excerpt.sigmf-meta
md5:843f3b73e7bfd3fc5f57f7dba3302ea4
913 Bytes Download
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