Radio and Radar Astronomy Projects for Beginners by Steven Arnold

Author:Steven Arnold
Language: eng
Format: epub
ISBN: 9783030549060
Publisher: Springer International Publishing

Within the SuperSID manual or via the Stanford website, a list can be obtained of VLF stations and their operating frequencies and location (latitude and longitude). Each station is denoted by a three-letter ID. For example, GBZ is the ID for the Authorn station used by the United Kingdom, and its operating frequency is 19.6 KHz.

Looking at the data that has been collected over the last few days while running the SuperSID, you can check the frequencies against the list of VLF station frequencies. These are the stations that the equipment can receive, and it may be surprising to see the distance that the signal has traveled from the transmitter to the equipment.

Next, tell the operating program of the SuperSID which frequencies to monitor. This is done by accessing the parameters information again. Once the parameter file has been opened, scroll down until Station 1 is seen on the list. This can be changed in the same way that the site name and location were changed earlier.

Below the heading of Station 1 is a list of three items: (1) call sign, (2) color and (3) frequency. At the side of the call sign, enter the three-letter station ID, for example GBZ. The color can be left alone. “r” for example stands for the color red, and this means that this station will show up on the finished graph as a red line. This is useful when comparing more than one station at a time. If averse to the color red for whatever reason, maybe due to color blindness, you can change the color setting.

Beside the frequency, enter the station’s frequency . This must be typed in full, for example as “196000” and not “19.6.” Do this for each of the stations on the list, then close the parameter file.

To confirm that the stations that have been programmed into the SuperSID’s operating program are in fact stations and not just an annoying bit of interference, there is one further test to perform. Run the SuperSID monitor for at least 24 h to get a day’s worth of data. When this has been done, this data should be accessed while the SuperSID program is running. To access the data, click on the plot tab in the top left-hand corner. The list of data for each of the stations that have been selected will be there, and the data can be recognized by the three letters of the station’s ID. Click on the required station and open it. A graph will be produced. Look for sunrise and sunset changes within the graph. See Fig. 10.12.

Fig. 10.12SuperSID data showing sunrise and sunset changes

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