Live audio spectrogram 49.970
MHz b/w ~120Hz as received in Tavistock, Devon, UK. Approx 1hr
Below: plot of meteor rate and signal duration per hour.
One tick per hour and approx 5 days of history. The latest data is on the right >>
"Count +5" etc refers to the detection trigger levels of noise
+5dB, noise +10dB etc.
The duration shown is seconds per hour of signal received above
the trigger thresholds.
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How is this data
collected and how do I use it?
The data above is compiled from signals reflected by meteor
heads and trails. I am now receiving the DOURBES meteor beacon on 49.970 MHz. The
transmitter is located beyond the normal
direct reception range at a distance of 630km. The hills of Dartmoor
National Park shield me from the majority of any direct
reception, although I will be susceptible to extra signals and
interference during tropo propagation events. These events may
falsely increase the counts and initiate false meteor activity
I use DL4YHFs Spectrum Lab software to process data from signals
received on a Yaesu FT-857 transceiver.
Spectrum Lab is programmed to send email alerts (using 3rd party
How to receive meteor activity alerts?
"HIGH" and "VERY-HIGH" meteor activity alerts are issued via
email (subscribe to alerts here)
posted on my blog page
and sent via my Twitter feed
My system is used in the following graphic (from www.qrz.com) to supply the
MS CNT (Meteor Scatter Count) and MS CND (Meteor Scatter Conditions) data.
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