I am grateful to the help of John Berman on this project – I based the arrangement at LRO on his design. It uses Spectrum Lab Spectrum Analyser software, and direct input from the VLF aerial (150m 22 SWG enamelled copper wire wound around a vertical wooden cross) into an USB external 96kHz audio sound, which is detected by Spectrum Lab.
John Berman’s own working Spectrum Lab Spectrum Analyser Software configuration file:
John Berman’s description of how he made the VLF aerial and receiver in his radio shack:
https://www.astronomy.me.uk/wp-content/uploads/2026/02/SID-Station-using-Spectrum-Lab-2.docx
Test data from John Berman’s radio shack:
A copy of the Spectrum Lab user manual:
https://www.astronomy.me.uk/wp-content/uploads/2026/02/Spectrum-Lab-Spectrum-Analyser-Manual.pdf
I initially tested the software and sound card at LRO using an existing 70cm UKRAA VLF Aerial I own, and this shows successful detection of several VLF stations using that setup:
Plots from first light test 21/2/2026 – VLF station frequencies (in kHZ) listed on bottom of plots:
