I use the tool at the botttom of this page:
My locator is JO11tm and that gives sunrise at 06:14 UTC and start
of the twilight (grey line, my guess) zone at 05:40 UTC.
I have attached a screenshot that clearly shows the effect of
pre-dawn enhancement, whilst Joe's signal disappears rather quickly
There is a seasonal effect on this type of enhancement.
I have yet to see an after sunrise enhancement in summer, whilst
this is common in mid-winter.
Markus, I am living 8 km from the coast and this location is
excellent for T/A reception. Reception from the (south) east is far
The following section of this message contains a file attachment
prepared for transmission using the Internet MIME message format.
If you are using Pegasus Mail, or any other MIME-compliant system,
you should be able to save it or view it from within your mailer.
If you cannot, please ask your system administrator for assistance.
---- File information -----------
Date: 8 Mar 2015, 8:16
Size: 246008 bytes.
Description: GIF image