Christoph

I agree with @jks. The dominant source of error is ionospheric propagation. In addition, not all KiwiSDRs report their position accurately, i.e., their positions are either put manually by the owners or get rounded in order not to reveal the exact location of a given KiwiSDR.

Also consider the fact that one sample at 12000 samples/sec corresponds to 25 km, and the bandwidth of most signals on shortwave is less than 12 kHz. So if the bandwidth of a signal is 3 kHz the corresponding pseudo-range resolution is 100 km.

Having said that, it would be interesting to compare the stability of the KiwiSDR GNSS-derived timestamps w.r.t. ones from a GNSS-disciplined rubidium standard.

Did you mean SAM mode? It's the only mode in which I find the "channel null" menu.

Small correction: as far as I know the squelch feature in kiwirecorder.py was implemented by its original author and not by me.

Small correction: as far as I know the squelch feature in kiwirecorder.py was implemented by its original author and not by me.

see https://hcab14.blogspot.com/2020/06/am-modulation-index.html
and https://github.com/hcab14/gr-kiwisdr/blob/master/examples/am_rms_modulation_depth_kiwi.grc

see https://hcab14.blogspot.com/2020/06/am-modulation-index.html
and https://github.com/hcab14/gr-kiwisdr/blob/master/examples/am_rms_modulation_depth_kiwi.grc

Hi Rob,

I can reproduce the problem. A fix is on its way. There is no need to reinstall python.

See kiwirecorder.py https://github.com/jks-prv/kiwiclient/tree/jks-v0.1

Following an idea by @WA2ZKD, the coherent combination of KiwiSDR streams was tested using a DRM signal. DRM data was successfully decoded from two coherently combined IQ data streams where the boundary between the two data streams was centered on the center frequency of the DRM signal.



See also https://hcab14.blogspot.com/2019/03/kiwisdr-iq-data-streams-with-2025-khz_16.html.

Following an idea by @WA2ZKD, the coherent combination of KiwiSDR streams was tested using a DRM signal. DRM data was successfully decoded from two coherently combined IQ data streams where the boundary between the two data streams was centered on the center frequency of the DRM signal.



See also https://hcab14.blogspot.com/2019/03/kiwisdr-iq-data-streams-with-2025-khz_16.html.