Test tones on 1580kHz?

[Chris Mackerell <chris@xxxxxxxxxxxxxxxxxxxx>]

This message is sent by Chris Mackerell <chris@xxxxxxxxxxxxxxxxxxxx>
to hard-core-dx@xxxxxxxxxxxxxxxx:

Hi

I've just returned from a few days holiday where I was able to spend
a few hours Dxing the AM band.

On June 23 I was listening on 1580 kHz for a while around 04:45 UTC.

Most of the time the channel was dominated by KTWW, but I also
noticed that from 04:45 till past 05:00 I could here test tones
consisting of 10 seconds of 1 kHz tone, followed by 5 seconds
of silence.

Does anyone have any idea who that would have been?

73's

Chris

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