![]() Hardware descriptionĪ simplified diagram of the setup is presented in Fig 1, the main blocks are: There will be a separate article detailing how to use vlfrx-tools with this hardware setup on the website. This enables analysis of signals in the 10kHz range with resolution on the 1uHz order of magnitude. A 1PPS signal can be used as the reference. This enables receiving very weak signals if the transmitter and receiver have very good frequency stability. The phase of signals received in the VLF band can often be stable even over large distances. A description of a simple 1PPS distribution amplifier is here: Simple 1PPS signal source and distribution amplifier The sound card sample rate is compensated using a 1PPS signal source froma GPS receiver. This article shows an example of a simple setup used for VLF monitoring and ebnaut decoding. Paul Nicholson’s vlfrx-tools are one of the tools of choice when doing VLF monitoring and analysis. Simple setup for monitoring of VLF signals using vlfrx-tools ![]()
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