4X4XM's Site Map

https://www.qsl.net/4x4xm updated: 8-June-2025
  1. Homepage: Forecast HF propagation for radio amateurs
  2. Ham Radio Propagation Overview
  3. Ham Radio Range Guide: How Far Can You Talk?
  4. HF Propagation FAQ
  5. Index of technical terms related to skywave radio propagation
  6. Prediction vs Forecast of HF Band Conditions
  7. Search Terms for HF Radio Propagation
  8. Understanding HF Propagation:
    Forecast, Practice, Tutorial, Apps, Tools     relaying dynamically online data
    9. Featured page by The DXZone.com
  9. Understanding HF Propagation - The latest static snapshot
  10. Understanding HF Propagation - About
  11. Multilanguage: multilingual presentation
  12. התפשטות גלי רדיו בתחום ת"ג—HF
  13. Region vs. Layer: Earth's Atmosphere and Ionosphere
  14. Webmaster: Doron, 4X4XM - Personal Bio
FAQ
  1. At what Kp index can I see aurora?
  2. Can HF Radio Propagation be predicted?
  3. How Can We Forecast HF Propagation Conditions?
  4. How do HF propagation indices correlate with solar activity, geomagnetic activity, and space weather?
  5. How do I find out what bands are open?
  6. How do solar flares cause geomagnetic storms?
  7. How do the seasons affect HF radio propagation?
  8. How does the ionosphere affect HF Radio Propagation?
  9. How long does it take for Solar Wind to reach earth?
  10. How to determine if a band is open?
  11. What are band conditions banners?
  12. What are electromagnetic waves?
  13. What are Geomagnetic Disturbances?
  14. What are Geomagnetic Storms?
  15. What are HF band conditions?
  16. What are ionospheric clouds?
  17. What are ionospheric conditions?
  18. What are ionospheric storms?
  19. What are propagation indices?
  20. What are Radio Blackouts?
  21. What are Radio Waves?
  22. What are Solar Flares?
  23. What are Solar Storms? How they induce Geomagnetic Storms?
  24. What are sprites in Earth's atmosphere?
  25. What are Sunspots?
  26. What are the current HF Propagation Conditions?
  27. What are the forecasting tools for HF radio propagation?
  28. What are the modes of HF Radio Propagation?
  29. What are the most common modes of HF Radio Propagation?
  30. What are the Solar Indices?
  31. What causes geomagnetic storms?
  32. What causes HF propagation?
  33. What causes ionospheric ionization?
  34. What factors influence HF Radio Propagation?
  35. What is Geomagnetic Activity?
  36. What is a Geomagnetic Disturbance?
  37. What is a Geomagnetic Storm?
  38. What is Earth Magnetosphere?
  39. What is Greyline propagation?
  40. What is Ham Radio Propagation?
  41. What is HF Propagation
  42. What is HF Radio Propagation?
  43. What is HF Radio Propagation Prediction?
  44. What is HF Wave Propagation?
  45. What is ionization, in the context of HF radio propagation?
  46. What is LUF?
  47. What is MUF? How to predict MUF?
  48. What is NVIS? » Real-time NVIS Propagation Map
  49. What is plasma?
  50. What is radio propagation?
  51. What is sky wave propagation?
  52. What is skywave propagation?
  53. What is solar activity?
  54. What is solar flux index?
  55. what is solar wind?
  56. What is Space Weather?
  57. What is the current minimum usable frequency (LUF)?
  58. What is the current MUF?
  59. What is the difference between geomagnetic and ionospheric storms?
  60. What is the difference between global and regional HF propgation conditions?
  61. What is the difference between solar indices and propagation indices?
  62. What is the difference between solar proton flux and solar proton density?
  63. What is the difference between the Greyline and the Solar Terminator?
  64. What is the difference between the Magnetosphere and Earth's magnetic field?
  65. What is the magnetic field of Earth?
  66. What is total electron content (TEC)?
  67. When will HF band conditions improve?
  68. When will HF propagation conditions improve?
  69. When will propagation on HF improve?
  70. Why does space weather affect ham radio?
  71. Why is HF used for long range communication?
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 HF Propagation Conditions
  9. DX Propagation Online Map
  10. DX Propagation Prediction / Real-time HF Propagation Prediction
  11. Forecast short wave propagation conditions
  12. Forecasting propagation - tools for radio amateurs
  13. Ham Radio HF Propagation Real Time
    Real-time MUF map for HF propagation predictions
  14. Ham Radio Propagation Forecast
  15. Ham Radio Propagation Now
  16. Ham Radio Propagation: Solar Conditions
  17. Ham Solar
  18. Ham solar conditions
  19. HF bands allocated for radio amateurs and their characteristics
  20. HF bands open now
  21. HF Propagation
  22. HF Propagation App
  23. HF Propagation Calculator
  24. HF Propagation Chart
  25. HF Propagation Conditions - Global and Regional
  26. HF Propagation Expert
  27. HF Propagation Explained
  28. HF propagation for beginners
  29. HF Propagation for Newbees
  30. HF Propagation for Newbies
  31. HF propagation for radio hams
  32. HF Propagation Forecast
  33. HF Propagation Forecasting
  34. HF Propagation Modes
  35. HF Propagation Online Reports
  36. HF Propagation Overview
  37. HF Propagation Predictions
  38. HF Propagation Prediction Online
  39. HF Propagation Prediction Software
  40. HF Propagation Today
  41. HF Propagation Tools
  42. HF Propagation Widget
  43. HF Radio Propagation for Radio Amateurs
  44. HF Radio Propagation Indices and Scales
  45. HF Radio Propagation Tutorial for Radio Amateurs
  46. HF Skywave Propagation For Radio Amateurs
  47. HF Radio Propagation
  48. HF Radio Propagation Today
  49. Importance of HF Frequency Management
  50. Index of terms related to HF radio propagation
  51. Indicators of HF propagation and space weather
  52. Ionosphere Radio Wave Propagation (Skywaves)
  53. Live solar events and past solar activity
  54. NET vs. IRI ionospheric models
  55. Propagation indices
  56. Propagation of high frequency radio waves | The rebirth of HF
  57. Propagation of Short Radio Waves
  58. Radio Communication and The Ionosphere
  59. Radio Wave Propagation Forecasting
  60. Real-time DX Reports * HF Propagation Prediction
  61. Real-time HF Propagation Reports
  62. Real-time Radio Propagation Reports
  63. Real-time reports of HF propagation
  64. Real-time reports of radio propagation
  65. Radio wave propagation today
  66. Real-time HF propagation charts
  67. Real-time reports of space weather
  68. Real-time space weather reports
  69. Shortwave Propagation
  70. Skywave concept
  71. Solar Activity & Ham Radio Propagation
  72. Solar Conditions & Ham Radio Propagation
  73. Solar Cycle Ham Radio
  74. Solar Flux Today
  75. Solar Storms Ham Radio
  76. Space Weather Nowcast by Serge Y. Stroobandt, ON4AA, will open a new window
  77. Space Weather Predictions
  78. The Rebirth of Shortwave Radio Communication
  79. The Solar Flux Today
  80. Tools for Forecasting and Predicting HF Propagation Conditions for Radio Amateurs
  81. Types of radio wave propagation
  82. Understanding CF vs MUF
  83. Understanding HF propagation banners
  84. Understanding HF Radio Propagation
  85. Understanding LUF and MUF
  86. Understanding Skywave Propagation
  87. Weather influence on HF radio propagation
  88. Which ham band is open now?
  89. Which ham bands are open now?

Books and Articles

  1. A Primer on Space Weather
  2. An Introduction to Ionosphere and Magnetosphere(Abstract)
  3. Australian Space Weather Alert System (2024)
  4. Basic Wave Propagation, Nor Hadzfizah Binti Mohd Radi (2017)
  5. Comparing Ionospheric MUF using IRI16 Model with Mid Latitude (2020)
  6. Correlation Between The Sunspot Numbers and Geomagnetic Parameters for The Solar Cycle 24
  7. Correlation analysis of Solar activity and Cosmic ray (J_Phys_Conf 2017)
  8. Correlation of Sunspot Numbers and Geomagnetic Indices with Various Climate Change Parameters (2024)
  9. Critique of IONCAP's Reliability and Service Probability Calculations (1993)
  10. Detection and Localization of F-layer Ionospheric Irregularities (2022)
  11. Equatorial Spread-F Ionospheric dynamics (1962)
  12. Geomagnetic storm and equatorial spread-F (2004)
  13. HamSCI Space Weather Operational Resources and Needs of the Amateur Radio Community (2020)
  14. Introduction to HF Radio Propagation Australian Gov (2002)
  15. Introduction to-HF Radio Propagation Australian Gov (2007)
  16. Ionospheric Propagation, Prof. Sean Victor Hum (2018)
  17. Ionospheric Radio Propagation, Kenneth Davies (1965)
  18. John Ashworth Aatcliffe (12-December-1902-25-October 1987)
  19. Modeling the Topside Ionosphere Observations by Satellites (2003)
  20. NM7M’s-HF-Propagation-tutorial-2015-by-Thierry-Lombry,-LX4SKY (txt file)
  21. NM7M HF Propagation tutorial
  22. NVIS: Stephen C. Finch AI0W (2008)
  23. Propagation Modes, Ken Larson, KJ6RZ (2024)
  24. Propogation and RadioScience, KL7AL (ARRL 2005)
  25. Radio Wave Propagation part-1 Introduction, Marcel H. De-Canck, ON5AU (2002)
  26. Radio Waves and the Ionosphere, G3YWX (QST 1999)
  27. Solar UV and X-ray spectral diagnostics (2018)
  28. Space weather effects on communications systems (June 2020)
  29. Stanley article of the month (QST-June-2021)
  30. The Big Gun`s Guide to Low Band Propagation: A book by NM7M (2002)
  31. The Little Pistol's Guide to HF Propagation Robert R. Brown, Worldradio Books (1996)
  32. Understanding LF and HF propagation, G0KYA, G3NYK, RSGB (2010)
  33. Understanding Propagation: Paul L. Herrman, N0NBH (11-July 2010)
  34. Understanding Propagation WB5ANN.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 increases during
ionospheric events that disrupt HF radio propagation.


Visits (per day) during the last 3 months
correlate with ionospheric events that disrupt HF radio propagation.


Visits (per day) during the last month
correlate with ionospheric events that disrupt HF radio propagation.


Visits (per hour) today