The transmitter is running happily so I will leave it
on for a few more hours.

 Frequency: 137455.00000 Hz
 Coding: 8K19A
 Chars: 12
 Symbols: 848 at 2 seconds
 Duration: 1696 seconds, 00:28:16.00
 Repeat: Each hour, XX:00

There was a short interruption to the carrier 20:36 to 20:40
when I turned off to tidy up some cables.

Remarkably it is having no adverse effect on VLF reception,
despite the extended antenna passing within 50m of one of
the VLF receivers.

--
Paul Nicholson
--