vk5qi

I've spotted similar on the VK5ARG KiwiSDR:

At first I thought there was some issue with the site, or someone had driven a RF-noisy car up to the antenna, but It was also visible on the Australian Bureau of Meteorology's Learmonth Spectrograph.

73

Mark VK5QI

Just as a bit more information on this one, here's a spectrogram plot from one of the KiwiSDRs over a few days, and also the estimated total RX power (just from summing all the bins). The scales are not quite matching, still some work to do there.

I'm not sure what the clipping point of the KiwiSDR is, or how accurate the RX Power estimate I'm doing is.

Anyway, the day/night cycles are clearly visible, and you can see those large red bands of shortwave stations that are causing me problems at some times!

EDIT: The code to capture the required data and generate the above plots is now on github here: https://github.com/darksidelemm/kiwisnr-rrd

73 Mark VK5QI