Many thanks to SRAA contributor, Tom Laskowski, who shares the following recording and notes:
I used to make it a habit to tune to this station just to hear this great Inverval
Signal and sign-on. This usually boomed in on 7255 kHz at sign-on. I have not listened
in years but hope it is still there. I probably logged this on my ICF-2001 back then.
Date of recording: 5/16/1982
Starting time: 0530
Location: South Bend, Indiana