4X4XM's Site Map

https://www.qsl.net/4x4xm updated: 6-September-2025
  1. Homepage: Forecast HF propagation for radio amateurs
  2. Simple and easy site navigation
  3. Ham Radio Propagation Overview
  4. Ham Radio Range Guide: How Far Can You Talk?
  5. HF Propagation FAQ
  6. Index of technical terms related to skywave radio propagation
  7. Prediction vs Forecast of HF Band Conditions
  8. Search Terms for HF Radio Propagation
  9. Understanding HF Propagation:
    Forecast, Practice, Tutorial, Apps, Tools     relaying dynamically online data with explanations.
    10. Featured page by The DXZone.com
  10. Understanding HF Propagation - The latest static snapshot
  11. Understanding HF Propagation - About
  12. Multilanguage: multilingual presentation
  13. התפשטות גלי רדיו בתחום ת"ג—HF
  14. Region vs. Layer: Earth's Atmosphere and Ionosphere
  15. Webmaster: Doron, 4X4XM - Personal Bio
Propagation
  1. A comparison between Radio and Light propagation phenomena
  2. A Quick Guide to HF Propagation Using Solar Indices
  3. An introduction to HF propagation
  4. Amateur Radio Propagation Today
  5. Band Conditions
  6. ChatGPT Compares forecasting tools for radio amateurs
  7. Compare DR2W propagation tool with VOACAP
  8. Current ham band conditions
  9. Current Ham Band Conditions Explained
  10. Current ham band propagation
  11. Current ham band propagation conditions
  12. Current ham radio conditions
  13. Current Hambands conditions
  14. Current ham radio condition charts
  15. Current HF Bands Conditions
  16. Current HF Propagation Conditions
  17. Current propagation
  18. DX band conditions
  19. DX ham band conditions
  20. DX Propagation Online Map
  21. DX Propagation Prediction / Real-time HF Propagation Prediction
  22. Forecast ham band conditions
  23. Forecast short wave propagation conditions
  24. Forecasting propagation - tools for radio amateurs
  25. Ham band conditions
  26. Ham band map
  27. Ham conditions
  28. Ham propagation
  29. Ham radio condition
  30. Ham radio condition map
  31. Ham Radio HF Propagation Real Time
    Real-time MUF map for HF propagation predictions
  32. Ham Radio Propagation Charts
  33. Ham Radio Propagation Forecast
  34. Ham Radio Propagation Now
  35. Ham Radio Propagation: Solar Conditions
  36. Ham Radio YouTube Channels skywave propagation
  37. Ham Solar
  38. Ham solar conditions
  39. HF bands allocated for radio amateurs and their characteristics
  40. HF bands open now
  41. HF Propagation
  42. HF Propagation App
  43. HF Propagation Calculator
  44. HF Propagation Chart
  45. HF Propagation Condition Map
  46. HF Propagation Conditions - Global and Regional
  47. HF Propagation Expert
  48. HF Propagation Explained
  49. HF propagation for beginners
  50. HF Propagation for Newbees
  51. HF Propagation for Newbies
  52. HF propagation for radio hams
  53. HF Propagation Forecast
  54. HF Propagation Forecasting
  55. HF Propagation Modes
  56. HF Propagation Online Reports
  57. HF Propagation Overview
  58. HF Propagation Predictions
  59. HF Propagation Prediction Online
  60. HF Propagation Prediction Software
  61. HF Propagation Today
  62. HF Propagation Tools
  63. HF Propagation Widget
  64. HF Radio Propagation
  65. HF Radio Propagation for Radio Amateurs
  66. HF Radio Propagation Indices and Scales
  67. HF Radio Propagation Tutorial for Radio Amateurs
  68. HF Skywave Propagation For Radio Amateurs
  69. HF Radio Propagation Today
  70. Importance of HF Frequency Management
  71. Index of terms related to HF radio propagation
  72. Indicators of HF propagation and space weather
  73. Ionosphere Radio Wave Propagation (Skywaves)
  74. Live solar events and past solar activity
  75. NET vs. IRI ionospheric models
  76. Propagation conditions
  77. Propagation forecast
  78. Propagation indices
  79. Propagation of high frequency radio waves | The rebirth of HF
  80. Propagation of Short Radio Waves
  81. Propagation report
  82. Radio communication and the ionosphere
  83. Radio communication and the ionosphere
  84. Radio propagation charts
  85. Radio Wave Propagation Forecasting
  86. Real-time DX Reports * HF Propagation Prediction
  87. Real-time HF Propagation Reports
  88. Real-time propagation conditions
  89. Real-time propagation map
  90. Real-time radio propagation map
  91. Real-time Radio Propagation Reports
  92. Real-time reports of HF propagation
  93. Real-time reports of radio propagation
  94. Radio wave propagation today
  95. Real-time HF propagation charts
  96. Real-time reports of space weather
  97. Real-time space weather reports
  98. Shortwave Propagation
  99. Skywave concept
  100. Solar Activity & Ham Radio Propagation
  101. Solar Conditions & Ham Radio Propagation
  102. Solar Cycle Ham Radio
  103. Solar Flux Today
  104. Solar propagation
  105. Solar Storms Ham Radio
  106. Space Weather Nowcast Serge Y. Stroobandt, ON4AA
  107. Space Weather Predictions
  108. Skywave Propagation Today
  109. The Rebirth of Shortwave Radio Communication
  110. The Solar Flux Today
  111. Tools for Forecasting and Predicting HF Propagation Conditions for Radio Amateurs
  112. Types of radio wave propagation
  113. Understanding CF vs MUF
  114. Understanding Band Conditions Banners
  115. Understanding HF Radio Propagation
  116. Understanding LUF and MUF
  117. Understanding Skywave Propagation
  118. Weather influence on HF radio propagation
FAQ
  1. At what Kp index can I see aurora?
  2. Can HF Radio Propagation be predicted?
  3. How are current band conditions?
  4. How Can We Forecast HF Propagation Conditions?
  5. How do HF propagation indices correlate with solar activity, geomagnetic activity, and space weather?
  6. How do I find out what bands are open?
  7. How do solar flares cause geomagnetic storms?
  8. How do the seasons affect HF radio propagation?
  9. How does the ionosphere affect HF Radio Propagation?
  10. How long does it take for Solar Wind to reach earth?
  11. How to determine if a band is open?
  12. What are band conditions banners?
  13. What are electromagnetic waves?
  14. What are Geomagnetic Disturbances?
  15. What are Geomagnetic Storms?
  16. What are HF band conditions?
  17. What are ionospheric clouds?
  18. What are ionospheric conditions?
  19. What are ionospheric storms?
  20. What are propagation indices?
  21. What are Radio Blackouts?
  22. What are Radio Waves?
  23. What are Solar Flares?
  24. What are Solar Storms? How they induce Geomagnetic Storms?
  25. What are sprites in Earth's atmosphere?
  26. What are Sunspots?
  27. What are the current HF Propagation Conditions?
  28. What are the forecasting tools for HF radio propagation?
  29. What are the modes of HF Radio Propagation?
  30. What are the most common modes of HF Radio Propagation?
  31. What are the Solar Indices?
  32. What causes geomagnetic storms?
  33. What causes HF propagation?
  34. What causes ionospheric ionization?
  35. What factors influence HF Radio Propagation?
  36. What is Geomagnetic Activity?
  37. What is a Geomagnetic Disturbance?
  38. What is a Geomagnetic Storm?
  39. What is Earth Magnetosphere?
  40. What is Grayline propagation?
  41. What is Ham Radio Propagation?
  42. What is HF Propagation
  43. What is HF Radio Propagation?
  44. What is HF Radio Propagation Prediction?
  45. What is HF Wave Propagation?
  46. What is ionization, in the context of HF radio propagation?
  47. What is LUF?
  48. What is MUF? How to predict MUF?
  49. What is NVIS? » Real-time NVIS Propagation Map
  50. What is plasma?
  51. What is radio propagation?
  52. What is sky wave propagation?
  53. What is skywave propagation?
  54. What is solar activity?
  55. What is solar flux index?
  56. what is solar wind?
  57. What is Space Weather?
  58. What is the current minimum usable frequency (LUF)?
  59. What is the current MUF?
  60. What is the difference between geomagnetic and ionospheric storms?
  61. What is the difference between global and regional HF propgation conditions?
  62. What is the difference between solar indices and propagation indices?
  63. What is the difference between solar proton flux and solar proton density?
  64. What is the difference between the Greyline and the Solar Terminator?
  65. What is the difference between the Magnetosphere and Earth's magnetic field?
  66. What is the magnetic field of Earth?
  67. What is total electron content (TEC)?
  68. When will HF band conditions improve?
  69. When will HF propagation conditions improve?
  70. When will propagation on HF improve?
  71. Which ham band is open now?
  72. Which ham bands are open now?
  73. Why are ham bands closed?
  74. Why does space weather affect ham radio?
  75. Why is HF used for long range communication?
Books-and-Articles
  1. HamSCI-Space-Weather-Operational-Resources-and-Needs-of-the-Amateur-Radio-Community(2020)
  2. A-Primer-on-Space-Weather.pdf
  3. A-Simplified-Model-for-HF-Radio-Wave-Propagation-for-Middle-East-Region(2014).pdf
  4. An-Introduction-to-Ionosphere-and-Magnetosphere(Abstract).pdf
  5. Australian-Space-Weather-Alert-System-2024.pdf
  6. Basic-Wave-Propagation-Nor-Hadzfizah-Binti-Mohd-Radi-2017.pdf
  7. Comparing-Ionospheric-MUF-using-IRI16-Model-with-Mid-Latitude-2020.pdf
  8. Correlation-Between-The-Sunspot-Numbers-and-Geomagnetic-Parameters-for-The-Solar-Cycle-24.pdf
  9. Correlation-analysis-of-Solar-activity-and-Cosmic-ray-J_Phys_Conf-2017.pdf
  10. Correlation-of-Sunspot-Numbers-and-Geomagnetic-Indices-with-Various-Climate-Change-Parameters-2024.pdf
  11. Critique-of-IONCAP's-Reliability-and-Service-Probability-Calculations-1993.pdf
  12. Detection-and-Localization-of-F-layer-Ionospheric-Irregularities-2022.pdf
  13. Equatorial-Spread-F_Ionospheric-dynamics-1962.pdf
  14. Geomagnetic-storm-and-equatorial-spread-F-2004.pdf
  15. HF-Propagation-2-Prof-Pinhasi.pdf
  16. HamSCI_Space-Weather-Operational-Resources-and-Needs-of-the-Amateur-Radio-Community-2020.pdf
  17. Introduction-to-HF-Radio-Propagation-Australian-Gov-2002.pdf
  18. Introduction-to-HF-Radio-Propagation-Australian-Gov-2007.pdf
  19. Introduction-to-Ionospheric-Modeling-Bruno-Nava-Presentation(2020).pdf
  20. Ionospheric-Propagation-Prof.-Sean-Victor-Hum-2018.pdf
  21. Ionospheric-Radio-Propagation-Kenneth-Davies-1965.pdf
  22. John-Ashworth-Aatcliffe-12-December-1902-25-October-1987.pdf
  23. Modeling-the-Topside-Ionosphere-Observations-by-Satellites-2003.pdf
  24. NM7M%e2%80%99s-HF-Propagation-tutorial-2015-by-Thierry-Lombry,-LX4SKY.txt
  25. NM7M_HF_Propagation_tutorial.pdf
  26. NM7M’s-HF-Propagation-tutorial-2015-by-Thierry-Lombry,-LX4SKY.txt
  27. NOAA%e2%80%99s%20Space-Based%20Space%20Weather%20Observations%20(2023).pdf
  28. NVIS-Stephen-C-Finch-AI0W-2008.pdf
  29. Noji-Article-Band-Conditions-Banner-2018-12-05.pdf
  30. Propagation-Modes-Ken-Larson-KJ6RZ-2024.pdf
  31. Propagation_and_RadioScience.-KL7AL-ARRL-2005.pdf
  32. Propogation_and_RadioScience.-KL7AL-ARRL-2005.pdf
  33. Radio-Wave-Propagation-part-1-Introduction-Marcel-H-De-Canck-ON5AU-2002.pdf
  34. Radio-Waves-and-the-Ionosphere-G3YWX-QST-1999.pdf
  35. Regional-and-Long-Distance-Ken-Larson-KJ6RZ-2010.pdf
  36. Sky-Wave-Propagation(2019).pdf
  37. Solar-UV-and-X-ray-spectral-diagnostics-2018.pdf
  38. Space-weather-effects-on-communications-systems-June-2020.pdf
  39. Stanley-article-of-the-month-QST-June-2021.pdf
  40. Suggested-Correlation-Formula-between-High-Possible-Frequency-(HPF)-and-Optimum-Maximum-Usable-Frequency-(OPMUF)-over-Middle-East(2012).pdf
  41. The-Big-Gun%60s-Guide-to-Low-Band-Propagation-A-book-by-NM7M-2002.pdf
  42. The-Big-Gun`s-Guide-to-Low-Band-Propagation-A-book-by-NM7M-2002.pdf
  43. The-Little-Pistol's-Guide-to-HF-Propagation_Robert-R.-Brown_Worldradio-Books_1996.pdf
  44. Understanding-LF-and-HF-propagation-G0KYA-G3NYK-RSGB-2010.pdf
  45. Understanding-Propagation-Paul-L-Herrman-N0NBH-11-July-2010.pdf
  46. Understanding-Propagation-WB5ANN.pdf
  47. Understanding-Solar-Indices-Ian-Poole-G3YWX-QST-September-2002.pdf
Shortcasts — short podcasts
  1. Index of 4x4xm's Shortcasts
  2. Aurora Propagation MP3 Sound
  3. Backscatter Radio Propagation MP3 Sound
  4. Field-Aligned Irregularities Propagation MP3 Sound
  5. HF skywave propagation for amateur radio MP3 Sound 9 minutes
  6. HF skywave propagation for amateur radio MP4 Video 9 minutes
  7. HF skywave propagation for amateur radio Script
  8. Ionospheric Regions Solar Index Skywave Propagation MP3 Sound
  9. Meteor Scatter Radio Propagation MP3 Sound
  10. Propagation Modes Review MP3 Sound
  11. Propagation of radio waves explained MP3 Sound
  12. Propagation of radio waves summary MP3 Sound
  13. Solar activity and tools for radio hams MP4 Video 6 minutes
  14. Sporadic E Propagation MP3 Sound
  15. The fascinating world of HF skywave propagation
  16. Transequatorial Propagation MP3 Sound
  17. What Are Radio Waves? MP3 Sound
Find below audio clips in various languages (in alphabetical order):
  1. Arabic | عربي: التنبؤ بظروف الاتصال لهواة الراديو
  2. Chinese | 中国人: 预测无线电爱好者的通信条件 - 无线电波传播
  3. Dutch | Nederlands: Voorspelling van communicatievoorwaarden voor radioamateurs
  4. French | Français: Prévision des conditions de communication pour les radioamateurs
  5. German | Deutsch: Vorhersage der Kommunikationsbedingungen für Funkamateure
  6. Hebrew
    עברית: חיזוי התפשטות גלי רקיע - גלים בתדר גבוה (ת"ג) - חובבי רדיו - תנאי תקשורת
  7. Hindi | हिंदी: ेडियो शौकीनों के लिए संचार स्थितियों का पूर्वानुमान लहर प्रसार
  8. Italian | italiana: Previsione delle condizioni di comunicazione per radioamatori
  9. Japanese | 日本語: アマチュア無線家の通信状況を予測する
  10. Korean | 한국인: 아마추어 무선 통신 조건 예측
  11. Portuguese | Português: Previsão de condições de comunicação para radioamadores
  12. Spanish | española: Predicción de las condiciones de comunicación para radioaficionados
  13. Russian | Русский: Прогнозирование условий связи для радиолюбителей распространение волн
Total visits since 17 August 2022.

Repeat visits counted as new after 24 hours.

Flag counter site maybe down! all time
Visits (per day) since 17-August-2022
The number of site visits increased during
ionospheric events that disrupt HF radio propagation.


Visits (per day) during the last 3 months.


Visits (per day) during the last month.


Hourly visits today