| sunspotwatch.org | |
| 网站标题： | Current sunspot cycle activity - Solar Cycle 25; Space weather, solar storm and geomagnetic conditio |
| 网站简介： | High frequency and VHF radio propagation data, solar and geomagnetic real-time and historic data, sunspot activity reports, as well as forecasts. A comprehensive propagation resource compiled by Tomas Hood, editor of the propagation columns of CQ, CQ VHF, Popular Communications, and Monitoring Time |
| 关键字： | high frequency radio propagation design analysis line-of-sight diffraction RF wireless Ham Radio HF progagational data solar sun sunspots communications geomagnetic ionospheric conditions events flare |
| SunSpotWatch.com | |
| 网站标题： | Current sunspot cycle activity - Solar Cycle 25; Space weather, solar storm and geomagnetic conditio |
| 网站简介： | High frequency and VHF radio propagation data, solar and geomagnetic real-time and historic data, sunspot activity reports, as well as forecasts. A comprehensive propagation resource compiled by Tomas Hood, editor of the propagation columns of CQ, CQ VHF, Popular Communications, and Monitoring Time |
| 关键字： | high frequency radio propagation design analysis line-of-sight diffraction RF wireless Ham Radio HF progagational data solar sun sunspots communications geomagnetic ionospheric conditions events flare |
| hamqsl.com | |
| 网站标题： | Worldwide HAM Radio QSL Website - Rankings - All Sites |
| 网站简介： | Database driven topsite (with ranking buttons) for Ham Radio Operators Worldwide, where you can post your banner, logo, or station/shack photo, and users rate your linked web site. Your rated by the number of people that visit your site! |
| 关键字： | ham radio QSL worldwide stations shack topsite listing rank rankings rated photos linked linked repeaters lightning muf maximum usable frequency ionospheric x-ray absorption ham aprs cwop solar propag |
1/1 [1]