{"id":57987,"date":"2023-10-13T10:00:13","date_gmt":"2023-10-13T14:00:13","guid":{"rendered":"https:\/\/swling.com\/blog\/?p=57987"},"modified":"2023-10-13T06:40:34","modified_gmt":"2023-10-13T10:40:34","slug":"important-change-to-the-great-medium-wave-grey-line-challenge","status":"publish","type":"post","link":"https:\/\/swling.com\/blog\/2023\/10\/important-change-to-the-great-medium-wave-grey-line-challenge\/","title":{"rendered":"Important change to The Great Medium Wave Grey Line Challenge"},"content":{"rendered":"

\"\"<\/a>by Jock Elliott, KB2GOM<\/p>\n

On the very helpful advice of 13dka, who noted that “this should be optional \u2013 the grayline happens twice a day, with the morning grayline favoring westerly propagation paths and the evening grayline the east,” participants in the challenge can now choose either the grey line in the morning as the sun rises, or the grey line in the evening as the sun sets . . . but not both<\/span>.<\/strong><\/p>\n

Otherwise, the rules remain the same, and the challenge will be open for participation with the grey line at dawn tomorrow.<\/p>\n

    \n
  1. Frequency range is the medium wave band: 520-1710 kHz<\/li>\n
  2. From one hour before<\/em> Civil Twilight your local time<\/u><\/strong> on Saturday, October 14<\/strong><\/em>, to one hour after<\/em> Civil Twilight at your location . . . at either sunrise or sunset.<\/li>\n
  3. Any radio with any antenna, but must be the radio at your location (no using remote internet radios)<\/li>\n
  4. The listener must hear the signal in real time<\/li>\n
  5. The stations must be ID\u2019ed by listening to the signal.<\/li>\n
  6. Your report should include:\n