#USING A PC WITH SOUNDCARD AS A VLF RECEIVER SOFTWARE#
General considerations about the reception technique and analysis software the spectral analysis of a sound signal shall be done, which is fed via an other soundcard entrance in the PC. For VLF reception, the balance control of this entrance should be put in the middle and the loudness regulator to maximal loudness.Īll these settings can be changed of course later, if e.g. Now you can set the sound card entrance you want to use. You will see a second dialog on the screen, click the button for "recording" and click afterwards on the "OK" button. On the dialog, which is now shown, click on the menu point for "options" and then choose from the sub menu the point "properties". You have to mind the sense (clockwise or counterclockwise) of the windings, otherwise the induced signals cancel each other out.Ī popup menu appears, on which you have to choose the option for "loudness" or "Open Volume Controls (w2k)". It is possible, if you want to achieve a higher sensitivity, to connect two or more coils in series. In buildings made of steel and concrete a place near the window is the best choice. In many shops ready-soldered plugs can be bought for all types of PC sound card inputs and you may need not even have to solder the necessary plug for the sound card input by yourself.įor good reception the coil should be placed as far away as possible from the PC (if possible at least 2 metres) and from other electrical devices, with the axis being parallel with the ground. As cable you can use any type with two conductors (although shielded or coaxial cable should be quieter). You only need one roll of insulated wire, which is connected to the LINE or MIC input of the sound card with a cable at least 2 metres long.
are of low importance and may vary in a widely. The electrical and mechanical properties of the coil, its inductance, resistance in ohms, number of turns, etc. This aerial should consist of a coil with as many windings and as large a diameter as possible. The use of an inductive aerial is recommended for VLF reception. 3 General considerations about the reception technique and analysis software.
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