VLF: OE5ODL over different paths

["Markus Vester" <markusvester@aol.com>]

Today's long carrier from OE5ODL provides another nice illustration of the diurnal modal interference patterns.

 

The receivers at about 200 km see a minimum before and around local noon

 OE3GHB http://members.aon.at/grabber/VLF/index.html ,

 DF6NM http://www.mydarc.de/df6nm/vlf/vlfgrabber.htm .

 

However at about 400 km, a maximum occurs at the same time

 DK7FC http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_VLF_Grabber.html  ("600" window).

 

Renato's line at about 600 km

 IK1QFK http://www.webalice.it/rromero/pontese/Spectrum3/last-LFtest.jpg

looks somewhat flatter, but apparently receiver gain had been stepped up at 12:45.

 

At nearly 2800 km,

 TF3HZ http://simnet.is/halldorgudmunds/TF3HZ_VLFgrabber/ ("2400" window)

again sees a rather flat inimum from about 10 to 12 UT.

 

Best 73,

Markus (DF6NM)