On 28 Jan 2026, monitoring was recalibrated to approximate RF dBm instead of 
audio levels.  Additionally, an estimated dBm level at 10m from the presumed
source of the Poplar Substation interference was added, which tracks the
120pps noise level, taking into account the inverse square law over the
distance.  This equates to roughly an estimated 29.5dB stronger signal,
though in practice it may be somewhat stronger due to inefficiencies in the
antenna design and cable attenuation, which are not accounted for.  This is,
therefore, a conservative estimate.

During the recalibration effort, some data points may be skewed and therefore
the chart for 28 January 2026 shows some inconsistencies.

On 29-31 January 2026 a fault in a coax switch caused significant signal
attenuation which unfortunately renders the data collected on these days 
unreliable from approximately 17:00 local time on 29 January 2026 
until approximately 13:00 local time on 31 January 2026.  These data should
be disregarded.