For further reading on this fascinating subject, here's a link to a recent post to the Yahoo VLF group: http://tech.groups.yahoo.com/group/VLF_Group/message/20605 Best 73, Markus (DF6NM) -- Original
For further reading on this fascinating subject, here's a link to a recent post to the Yahoo VLF group: http://tech.groups.yahoo.com/group/VLF_Group/message/20605 Best 73, Markus (DF6NM) -- Original
This evening the VLF-to-LF intermodulation near 137.1 kHz is unusually strong, an easily audible warbling sound from the two MSK modulations, and a fat reddish band on my grabber http://www.df6nm.de/
Three days ago (May 22), the powerful French Navy station HWU shifted its operating frequency from 21.75 to 22.6 kHz. This is closer to 23.4 kHz from German DHO, and consequently the intermodulation