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#TLC272CP VLF RECEIVER HOW TO#
#TLC272CP VLF RECEIVER PC#

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

#TLC272CP VLF RECEIVER PC#

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

Operation of Spectrum Lab, "SAQ" receiver.

In the reception of VLF natural radio (which is a broadband audioĪpplication), there is another document for you. Narrow-band signals in the VLF radio spectrum.

#TLC272CP VLF RECEIVER HOW TO#

This article describes how to use your PC as a receiver for Using a PC with soundcard as a VLF receiver