dump1090 – Gain vs. Performance

I took the opportunity for some experiments with gain settings in dump1090-fa while testing a new built antenna for the ADSB receiver. I compared my previously built QFH antenna to a G7RGQ omni directional antenna that I built last week. Second object of test was a 10m active USB cable (from Amazon).

1090MHz QFH on the left. G7RGQ omni on the right.

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dump1090-fa modification

I recently forked dump1090-fa on Github and modified the web code for indication of military or civil aircraft and highlighting aircrafts marked interesting. Required for this modification is an extended dump1090 JSON aircraft database that is available for download here. Outcome looks like this:

Indicating civil or military aircraft and detailed aircraft type. Interesting highlighted.

Interesting aircraft indication when selected.

Aircraft table with civil and military aircrafts. Interesting highlighted. External links are removed from table.

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DS18B20 on Raspberry Pi – Read failed CRC check [solved]

In a previous post I described the connection and usage of DS18B20 temperature sensors on a Raspberry Pi that serves my ADSB receiver. This setup was running for a while now and I have seen randomly read errors in /var/log/messages looking like this:

Jan  2 06:57:06 adsbreceiver kernel: [662143.679719] w1_slave_driver 10-000800507da4: Read failed CRC check
Jan  2 07:04:06 adsbreceiver kernel: [662563.782949] w1_slave_driver 10-000800507da4: Read failed CRC check
Jan  2 07:05:04 adsbreceiver kernel: [662622.182977] w1_slave_driver 10-000800507da4: Read failed CRC check
Jan  2 08:22:06 adsbreceiver kernel: [667243.852720] w1_slave_driver 10-000800507da4: Read failed CRC check
Jan  2 08:23:05 adsbreceiver kernel: [667303.023337] w1_slave_driver 10-000800507da4: Read failed CRC check
Jan  2 08:33:06 adsbreceiver kernel: [667903.780663] w1_slave_driver 10-000800507da4: Read failed CRC check
Jan  2 09:22:06 adsbreceiver kernel: [670843.967159] w1_slave_driver 10-000800507da4: Read failed CRC check
Jan  2 10:09:04 adsbreceiver kernel: [673662.309653] w1_slave_driver 10-000800507da4: Read failed CRC check
Jan  2 10:31:05 adsbreceiver kernel: [674983.100512] w1_slave_driver 10-000800507da4: Read failed CRC check

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