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Note: This location is now administered by the UK Antarctic Heritage Trust (UKAHT) - click link to go to their website.
Below are images of the WR-4d-BAS receiver and my actual (sloppy) notes/schematic of the receiver, which, when installed at Port Lockroy, worked(s) fabulously, receiving a lot of fascinating natural VLF radio phenomena for staff and visitors alike!
Essentially, this receiver is a very similar version to my WR-4b/d unit first constructed in September 1992. You will find a good amount of audio files recorded via the WR-4b/d unit.