Many thanks to SRAA contributor, Dan Greenall, who shares the following recording and notes:

Broadcaster: Radio Korea, Seoul

Frequency: 15.575 MHz

Reception location: Brantford, Ontario, Canada

Receiver and antenna: Panasonic RF-3100 and longwire antenna

Notes: Here is the interval signal of Radio Korea in Seoul as received in Brantford, Ontario, Canada circa 1983 on 15575 kHz shortwave. Bilingual identifications are heard followed by sign on in English. I was always happy to hear a strong clear signal from that part of the world.