Frequency checks were actually spread out all through the week, during those 12mid-6am hours (depending on the station's time zone). They used the ubiquitous 1000-cycle tone to allow the checker (mostly, Commercial Radio Monitoring Company, Kansas City) to be able to home in on the signal and give them their exact frequency. The National Radio Club's "DX News" regularly listed the scheduled f/c's for stations, as well as arranging special 30-minute or 1-hour "Courtesy Programs" to allow their members to log and verify stations that were otherwise pretty nearly impossible to catch.
My best 'graveyarder' back in my early 1950s DXing days was a 100-watter on (I believe) 1340 from Middletown NY, hauled in on my Zenith Trans-Oceanic in StuttgartAR. Think the CLs were WALL, but that was 55+ years and a lotta brain damage ago, hi!
My best 'graveyarder' back in my early 1950s DXing days was a 100-watter on (I believe) 1340 from Middletown NY, hauled in on my Zenith Trans-Oceanic in StuttgartAR. Think the CLs were WALL, but that was 55+ years and a lotta brain damage ago, hi!