Profile "r" which is contained in Spectrum Lab's installation
it's the usual decimal separator in Germany.Īll settings required for a receiver for 17.2kHz are contained in the user The neon lamp shall protect the FET against moderate statics,īut it's no protection against lightning. To have approximately half the supply voltage at its drain. Note: The lower FET's source resistor should be tweaked Site, an active antenna like the one shown below may also work for VLF narrowīand reception (even though it was designed as a broadband antenna see If there are no strong LF-, MF-, and HF-transmitters close to the receiver's In my own tests I have found that the system is very sensitiveĮven with only passive components (including 2 protection diodes on a 200 This will also protect your soundcard if you connect a longer If you can get the system (describedīelow) to work, add a simple LC network parallel to the input as VLF Of the soundcard and try to listen to a local signal source (like a
Soudblaster 16 has been tested, others work too, but some soundcards don't.)įor a start, just connect some meters of wire as an antenna to the MIC input The amplified audio is sent to the soundcard's D/A converter.Ī PC with at least 266 MHz Pentium II, a soundcard (original Creative Labs Soundcard runs at a sample rate of 44100 or 48000 Hz (seeįrequency is converted down to an audio frequency of 650Hz (or similar)Ħ50 Hz "Audio IF" is passed through a narrow-band filter (100Hz BW)
The PC is used to convert the VLF signal into an audible signal Note: some links only work if this file is located in the help directoryĬheck for the latest release of Spectrum Lab somewhere at
Amateur radio vlf receiver review how to#
This article describes how to use your PC as a receiver for Using a PC with soundcard as a VLF receiver