James Webb Space Telescope (JWST) L2

James Webb Space Telescope (JWST, L2)

Almost at the L2 point, currently setting up the mirrors. Quite strong at DSS54, Madrid at -88dBm on a 32m dish. Not quite as strong with me on a 1.2m dish with a ~4dB NF LNA. In addition, using a linear feed loses me 3dB. Too wide for the Airspy SDR but the whole signal is just visible on an analyser.

I'm now using a down-converter at the feed which may have improved the overall NF a little. Still using a linear feed.

JWST has been at L2 for a while now and the data rate was 28MBd and the signal -91.7dBm at DSS54, Madrid.

The signal was much more difficult to detect this time. I hadn't realised that the data rate must have been reduced when they were testing when I saw it in January. The plot below has the same span as the analyser plot above (50MHz total).