Links
Worldwide List
of HF Beacons by G3USF
(HF Beacon Coordinator).
Propagation studies Committee
page (RSGB).
Page
of NCDXF/IARU International Beacon Network.
Page of OK QRP club.
Thanks to Jiri Tuma
for corrections of english version.
My amateur photos (OK1DUB).
Special thanks to David Mach.