Explore Web SDR with DCO: access online software-defined radios, listen to real-time global frequencies, and join the radio enthusiast community. A WebSDR is a Software-Defined Radio receiver connected to the internet, allowing many listeners to listen and tune it simultaneously. SDR technology makes it possible that all listeners tune independently, and thus listen to different signals; this is in contrast to the many classical receivers that are already available via the internet. WEB SDR International WEB SDR Thessaloniki Greece by sv2hnh KIWI SDR International

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Access detailed reference maps for grid locators and DX communication. Improve accuracy and planning for HAM and 11m operations.

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Explore DX radio links. Find CB, HAM, and DX resources across the world to connect with operators and communities. All contnents: Africa, North-America, South-America, Australia & Oceania, Asia, Europe, Antarctica Usefull Links

Explore flight communication with DCO: resources, guides, and community for aviation radio enthusiasts, tracking aircraft and air traffic communications. Air radio / Aeronautical radio communication Flight Communication Frequencies Frequencies Worldwide Air Route Areas (MWARA) Aeronautical HF Radio Map This map is still from 2002. However, there should be no significant changes. Anyone who would like to have the current map can purchase it for a fee from the creator, Risto Hirvonen. Clicking on the map will enlarge it! Current positions of the aircraft

Discover antenna types, setups, and recommendations for 11m and HAM radios. Optimize your DX communication with DCO antenna guides.

Stay updated on radio weather and propagation conditions. Forecasts, aurora predictions, 50-MHz activity, and tutorials for CB and HAM operators.

Comprehensive 11m band prefix list for DX operators. Identify countries, regions, and call signs to enhance your CB and DX communication. Prefix Listing We as DCO are adding three new prefix numbers to the international lists. 359 div. = Mount Vigla Greece MVG (Mike Victor Golf) 360 Div. = Mount Olymp Greece MOG (Mike Oscar Golf) and intended for the far future: 400 div. = Moon Base MB (Mike Bravo)

Discover the QSL section with resources for CB and HAM operators. Exchange QSL cards, confirm contacts, and strengthen your DX network. DCO QSL CARD SECTION

Learn about radio wave propagation with step-by-step tutorials. Tips and guides for CB and HAM operators to improve signal understanding and performance. Propagation Tutorials Propagation Tutorials General Guidelines for Correlation of Propagation Indices to Actual HF Propagation Conditions Propagation tutorial by PA9X N0NBH's propagation tutorial (PDF) NM7M: The Little Pistol's Guide to HF Propagation (PDF) Propagation Broadcasts and Forecasts Demystified (PDF) RSGB Propagation Studies Committee (lots of info on different propagation modes) Understanding 10 (11) Meter Sporadic-E (understanding ES or “short skip”) Understanding Solar Indices by Ian Poole, G3YWX KP-index and Aurora KP-index and Aurora NE EURASIA KP-index and Aurora SE Africa-Indian Ocean-Australasia, Macquarie Island KP-index and Aurora NW NORTH AMERICA KP-index and Aurora SW SOUTH AMERICA; EASTERN PACIFIC The Sun Today: Directory to the Latest Solar Images and Interplanetary Data >>>

Get the latest radio propagation forecasts for CB, HAM, and shortwave bands. Stay informed on conditions affecting your communication worldwide. Radio Propagation Forecast for the 11m Band – 27 MHz 🌌 CB DX & 11-Meter Band Propagation Weather This page is dedicated to the current propagation conditions and radio weather for the 11-meter band (26–28 MHz), especially for CB DX and related activities. Here you will find important information and tools to monitor 11m band radio weather in real time. 📈 The 11-Meter Band and Its Propagation Characteristics The 11-meter band behaves similarly to HF but features unique propagation phenomena interesting for CB operators and DX hunters. Key propagation conditions: Sporadic E: Common in late spring and summer. Enables mostly short- to medium-range contacts (approx. 500–2000 km). F-layer propagation: Possible during high solar activity and sunspot cycles, supporting longer DX contacts. Tropospheric propagation (Tropo): Less common but can enhance short to medium range during weather inversions. 🌞 Radio Weather Factors for Optimal Conditions Solar cycle: High solar activity promotes propagation on 11m. Currently in Cycle 25 with rising activity. Solar Flux Index (SFI): Values above 100 indicate good propagation conditions. Geomagnetic quiet: A low K-index (<3) is ideal since strong geomagnetic disturbances can impair propagation. Time of day: Daytime usually offers better conditions, especially for Sporadic E. 🔄 Live Tools for Monitoring Radio Weather Use the following resources to track propagation conditions in real time: Solar data: Current SFI, K-index, sunspots, and X-ray flux MUF charts: Maximum usable frequency maps for propagation DX clusters: Real-time reports from CB and 11m operators WebSDR receivers: Listen live on 11-meter frequencies worldwide ⚠️ Note This page provides information on radio weather and propagation only. Legal or operational guidelines are not covered here. Please check local regulations separately. 📶 Good luck DXing and clear skies!