Monday, October 22, 2018

Burst signal monitoring using kiwirecorder.py

Recently burst signals on 7001.8 kHz (center) were observed on KiwiSDRs in Scandinavia. Simimlar bursts can be observed on 4089.8 kHz.

The bursts repeat every 5 seconds and are PSK8 modulated with 2400 symbols/sec. All bursts seem to be identical and have a weak peak in the auto-correlation function at ±215 samples corresponding to 43 symbols.

The bursts were recorded using kiwirecorder.py with the option --squelch-threshold 10 which starts a new file for each burst. The --squelch-tail option is new and can be used to set the time the squelch remains open after the signal is below threshold.

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