Below are images of the WR-4d-BAS receiver and my actual (sloppy) notes/schematic of the receiver, which, when installed at Port Lockeroy, 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.



