November 29, 2020

Weather satellite SDR back online

I used the old tripod for the hexbeam to put the QFH weather antenna up on some military camo poles. It’s at about 12ft. I secured the tripod with some concrete garden blocks for now.

I expected to get much cleaner images than when I had it in the attic at the old house but all I was getting was interference:

I’m using a Raspberry Pi 4 as the collector and I have loaded OpenWebSDR on it so I tuned it to the 137.9MHz frequency that the satellites use and found that I was receiving a broadcast station on that frequency. I had purchased an FM radio block filter but removed it as I didn’t find that it helped at the old location in the attic. Reinserting the block filter in between the RTLSDR dongle and the LNA removed the broadcast station. I was able to get a decode on the next pass, though I still have some interference, I’m happy to see that it’s working. I have the setup sitting on the floor in a jumble until I get my single panel ground and cable entry sorted into the shack so maybe that will clean up the signal. There’s a few passes this evening so we’ll see how it goes.

The WX page is available at https://aa0o.radio/wx/

Side note: I found the RTLSDR dongle would get unresponsive and looked for a script to reset the USB port. This script seems to work (it resets all USB ports so if you have other things besides the SDR dongle connected you might want to edit this):

for i in /sys/bus/pci/drivers/[uoex]hci_hcd/*:*; do
          [ -e "$i" ] || continue
          echo "${i##*/}" > "${i%/*}/unbind"
          echo "${i##*/}" > "${i%/*}/bind"
      done
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