Four Course Radio Range

[av8boy]

I am in search of an audio recording of a four course radio range/low frequency radio range/LFR signal. Although one can imagine the As and Ns and the fading-in and out of each, I'd certainly like to hear it for myself and, what's more, preserve a copy for posterity.

In that at least one LFR survived until 1981 (239 OE near Nome, Alaska), there appears to be some overlap between late LFRs and lightweight recording equipment, so it seems as though my search is not doomed from the start.

I’d love to have an actual recording of As, Ns, hums, bi-signals, transition through the cone of silence… the whole shebang, as an aircraft navigates using LFR. Of course, if someone has just one or two of these things I wouldn’t complain! However, the mother lode would be an audio file(s) covering all aspects of LFR.

Anyone have any ideas?

Futher, LFR approach plates and/or charts would be useful as well...

Thanks,

Dave