The Radio Meteor Signal Path from Transmitter to Spectrogram, Part 2

Figure 1. Combined reflected and directly received signal.

This is part two of an article that describes the signal path of a radio meteor. At the antenna of the receiver, the reflected signal is combined with a (much smaller) directly received signal. At first sight this might seem unimportant, since the amplitude of the direct component is typically much less than…

Submitted on 21 August 2016

The Radio Meteor Signal Path from Transmitter to Spectrogram, Part 1

Figure 1. Overview of the radio meteor signal path.

This is part one of a rather basic article that describes the complete signal path of a radio meteor, from the sinusoidal carrier wave that is initially transmitted, to the spectrogram that is typically used as the final result in the receiving chain. I have presented this material at…

Submitted on 1 August 2016

Gravitational Waves, a New Observational Window on the Universe

Simulation of two merging black holes [image: SXS, the Simulating eXtreme Spacetimes (SXS) project]

Not that I am going to try, but it is difficult to underestimate the importance of the first detection of gravitational waves for physics. Apart from the fact that it is another gloriously successful test for general relativity, it actually opens up a new observational window on the universe…

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Submitted on 24 April 2016

The Moving Average in the Financial Sector

Figure 4. Impulse (left), step (middle), and frequency (right) responses for Spencer’s 15-point moving average.

When researching what to include in The Moving Average as a Filter and Variations on the Moving Average, I came across a lot of references to applications in the financial sector. This is not my forte, but, just for fun, I gave a few of the moving averages that are used there the same treatment as the filters in…

Submitted on 29 February 2016