Lightning Antenna
From SpaceWeather
During a day with active weather, we witnessed some lightning activity with the antenna positioned outside the center. We recorded a few of the events, which were triggered by having at least three times the amplitude of the noise.
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Specifications
- Com-Power AB900 Features:
- Frequency Range: 30 MHz-300 MHz
- Polarization: Linear
- Power handling: 50 Watts continuous
- Impedance: Matched to 50 Ohm
- Connector: BNC (f)
- Weight: 7 lbs.
- Size: (L x W) 28.75" x 52.75"
- Transmit and receive capability
- Individual calibration
- Two year warranty
Samples
- Media:tek0005CH1.zip This is 1 million samples, which is too many. In the future we should only save about 10,000 from the Oscilloscope.
Octave code
- Media:worksheet.m This GNU Octave/MATLAB worksheet loads the CSV file above and performs a Fourier transform on two different clips from it: one with just background noise, and one that includes the trigger event. It also produces the plots seen below.
- Media:part2.m Take the FFTs for the signal and noise samples, subtract the noise energy from the signal, and plot the resulting FFT spectrum.
Plots
