Without a recording it would be impossible to say what you heard in Morse Code. However, it was almost certainly unrelated to V24, there are many sources of Morse Code on the air.
V24 used to have a Morse Code sister station called M94, however M94 has been inactive for almost 2 years. When M94 was active it used the same frequencies as V24, so 5715 kHz was one of the frequencies it used, but 5730 kHz was not. Also, it was in MCW, meaning you could listen to the Morse while using a radio in the AM mode of operation.
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