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| Subject: | Re: VLF: Auroral Chorus |
| From: | Andy Talbot <[email protected]> |
| Date: | Wed, 7 Apr 2010 14:03:43 +0100 |
| Cc: | Linda Holtby <[email protected]> |
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While we're on natural radio phenonema...
These were recorded years ago in 1997, in the early days of amateur radio DSP. They are of a carrier on 3572kHz transmitted, from me to G3PLX in Cumbria,
The off-air signal was mixed down and decimated then recorded at a sampling rate of 7.2 Hz in baseband I/Q format in a bandwidth of about 3Hz using the old 56002 DSP system of that era, Then they were speeded up 1000 times by the simple expedinnt of calling the sampling rate 7200Hz, then mixed up to give an audio tone and converted to .WAV files. It was exactly the same hardware used at Peter's end as for our record-setting first ever QRSS signal on 73kHz a few months before these were made.
The audio drift is the doppler due to the ionosphere moving over the several hours of monitoring.
On 7 April 2010 11:23, Paul Nicholson <[email protected]> wrote:
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