3 天之前 · The "grey line" is a band around the Earth that separates daylight from darkness. Propagation along the grey line is very efficient. One major reason for this is that the D layer, …

The "grey line" refers to the Earth's twilight zone, a boundary between day and night, and is used in radio communication to describe specific propagation conditions.

QSO MAP - Google map with QSO markers - Display your ham radio contacts on a high resolution map

For those who don’t know, the”grey line” is a band around the Earth that separates daylight from darkness as the earth rotates. Propagation along this line can be very efficient. One reason for …

2014年12月20日 · Simon Brown (G4ELI) author of SDR-RADIO has recently started writing another program called Greyline for Windows, and is still moving it forward. We are now up to …

DX Toolbox searches the web for you, gathering information on solar and geomagnetic conditions that affect radio propagation. It also features several propagation forecasting tools, allowing …

The links below provide information about Greyline propagation. Please note the RSGB is not responsible for the content of external websites. What is Greyline Propagation? © 2025 Radio …

Grey line or gray line propagation is a form of radio signal propagation that provides surprisingly long distance radio communications at dawn and dusk sometimes when other forms of …

Ham radio call database for everyone

Gray line map is a windows application for your desktop that show the gray line map of the world. Easy resizable and draggable anywhere in your windows desktop updates the gray line status …