Site Map

https://www.qsl.net/4x4xm
Created: 2025, December 28
  1. HF Propagation for Radio Amateurs
  2. Understanding HF Skywave Propagation
  3. HF Radio Propagation Basics
  4. HF Propagation FAQ
  5. Index of technical terminology related to skywave radio propagation
  6. HF-Propagation.pdf
  7. HF Radio Propagation FAQ
  8. Ham radio demographics
  9. Ham Radio Propagation Overview
  10. Ham Radio Range Guide
  11. 4X4XM, Doron Tal - Personal Bio
  12. Forecast vs Prediction of HF Band Conditions
  13. Region vs. Layer: Earth's Atmosphere and Ionosphere
  14. Search Terms for HF Radio Propagation
  15. HF Skywave Propagation for beginners and advanced radio amateurs
  16. 4x4XM's Site Map — HF propagation for Radio Amateurs
  17. HTML Sitemap - https://www.qsl.net/4x4xm
Shortcast
  1. Index of 4x4xm/Shortcast
  2. HF propagation podcasts / shortcasts
  3. The Fascinating World of HF Skywave Propagation
  4. HF-skywave-propagation-for-amateur-radio-script.txt
Propagation
  1. Index of /4/4x4xm//Propagation
  2. A comparison between Radio and Light propagation phenomena
  3. Amateur Radio Propagation Today
  4. An Introduction to HF Propagation
  5. Band Conditions
  6. Band Conditions
  7. Beginner guide to HF radio propagation
  8. Blackout of HF communication
  9. Compare DR2W propagation tool with VOACAP
  10. Forecasting tools for HF radio propagation
  11. Current Ham Bands Conditions
  12. Current HF Propagation Conditions
  13. Current HF propagation map
  14. Current Ham Band Conditions Explained
  15. Current Ham Band Conditions
  16. Current Ham Band Propagation
  17. Current Ham Band Propagation
  18. Current Ham Bands Conditions—Charts
  19. Current Ham Radio Condition—Charts
  20. Current Ham Radio Condition—Charts
  21. Current Ham Radio Conditions
  22. Current Ham Radio Propagation—Chart
  23. Current ham radio propagation charts
  24. Current Ham Radio Propagation Conditions
  25. Current Ham Radio Propagation
  26. Current Ham Bands Conditions
  27. Current shortwave propagation conditions
  28. Current propagation
  29. Real-time DX Reports * Forecasting HF Propagation
  30. DX Propagation Online Map
  31. DX Propagation Map
  32. DX Propagation Online Map
  33. Real-time DX Reports * HF Propagation Prediction
  34. DX band conditions
  35. DX conditions now
  36. DX conditions
  37. DX conditions today
  38. DX ham band conditions
  39. Forecast ham band conditions
  40. Forecast propagation
  41. Forecast propagation
  42. Forecast Shortwave Propagation Conditions
  43. Radio Amateur: Radio Operation Planning Tools
  44. Geomagnetic Storms
  45. Global-and-Regional-HF-propagation-Conditions.htm
  46. HF Propagation Conditions - Global versus Regional
  47. HF Propagation App
  48. HF Propagation Calculator
  49. HF Radio Propagation Chart
  50. HF Propagation Condition Map
  51. HF Propagation Expert
  52. HF Propagation Explained
  53. HF Propagation Forecast
  54. HF Propagation Live Map
  55. HF propagation Online Map
  56. HF propagation map
  57. HF Propagation Modes
  58. HF Propagation Online Reports
  59. HF Propagation Overview
  60. HF Propagation Prediction Online
  61. HF Propagation Prediction Software
  62. HF Propagation Prediction
  63. Indicators of HF propagation and space weather
  64. Guide to HF Propagation Using Solar and Geomagnetic Indices
  65. HF Propagation Today
  66. HF Propagation Tools
  67. HF Propagation Widget
  68. HF Propagation Forecasting
  69. HF Propagation status and alerts
  70. HF Propagation
  71. Reports, Indices and Scales for HF Radio Propagation
  72. HF Radio Propagation Today
  73. HF Radio Propagation
  74. HF bands open now
  75. HF propagation for beginners
  76. HF Propagation for Newbees
  77. HF Propagation for Newbies
  78. HF propagation for radio hams
  79. HF propagation prediction tools
  80. HF radio propagation for radio amateurs
  81. HF radio propagation index
  82. HF Radio Propagation Tutorials
  83. Understanding Skywave Propagation
  84. Ham condition chart
  85. Ham Radio Propagation Charts
  86. Ham Radio Propagation Planner
  87. Ham Radio Propagation Now
  88. Ham Radio Propagation Overview
  89. Ham Radio HF Propagation real-time map
  90. Ham Radio Propagation: Solar Conditions
  91. Ham Radio YouTube Channels skywave propagation
  92. Ham band condition for beginners
  93. Ham Band Conditions | Ham band conditions
  94. Ham band map
  95. Ham conditions
  96. Ham propagation
  97. Ham radio condition map
  98. Ham radio conditions
  99. Ham radio propagation planner
  100. Ham Radio Propagation map
  101. Ham Radio Propagation
  102. Ham radio secrets
  103. Ham solar conditions
  104. Importance of HF Frequency Management
  105. The Ionosphere and Skywave Propagation
  106. What is LUF Propagation Map?
  107. Line of sight propagation
  108. Live HF propagation maps and charts
  109. Current Solar Events and Past Solar Activity
  110. MUF propagation Online Map
  111. Real-time MUF Propagation Map
  112. MUF indictors
  113. MUF indices
  114. Mystery in wave propagation conditions
  115. NET vs. IRI ionospheric models
  116. Propagation conditions
  117. Propagation forecast
  118. HF Propagation Indices
  119. The Rebirth of Shortwave Radio Communication
  120. Propagation of high frequency radio waves | The rebirth of HF
  121. Propagation report
  122. Propagation conditions for DX
  123. Radio Amateurs HF Bands Charactaristics
  124. Radio Amateurs HF Tutorials
  125. Radio Communication Circuit
  126. Radio Communication and the Ionosphere
  127. Radio Frequency Propagation for Ham Radio
  128. Point-to-Point 24-hour HF propagation planner
  129. Ham radio QSO planner
  130. Radio Propagation Forecasting
  131. Radio Frequency Propagation for Ham Radio
  132. Radio Wave Propagation Forecasting
  133. Radio Wave Propagation Today
  134. Real-time HF Propagation Charts
  135. Real-time MUF Map
  136. Real-time HF Propagation Reports
  137. Real-time Space Weather Reports (SolarWx)
  138. Space Weather Nowcast by Serge Y. Stroobandt, ON4AA
  139. Shortwave Propagation
  140. Shortwave Radio Propagation Today
  141. Skywave Propagation Today
  142. Skywave concept
  143. Skywave Propagation for Radio Amateurs
  144. Solar Activity & Ham Radio Propagation
  145. Solar Conditions & Ham Radio Propagation
  146. Solar cycle ham radio
  147. Solar Flux Index Today
  148. Solar propagation
  149. Solar storms ham radio
  150. Space Weather Predictions
  151. Space wave propagation
  152. The mystery of HF propagation
  153. Types of radio wave propagation
  154. Understanding HF Conditions Banners
  155. Understanding Critical Frequency (CF) vs. MUF
  156. Understanding LUF and MUF: Why are the ham bands closed?
  157. Understanding HF Propagation Review DOC
  158. Understanding HF Propagation Review PDF
  159. Understanding HF radio propagation html
  160. Understanding radio propagation
  161. Weather influence on HF radio propagation
  162. What-are-the-most-common-modes-of-HF-Radio-Propagation.htm
  163. Why are ham bands closed?
  164. hf-propagation-app.htm
  165. hf-propagation-calculator.htm
  166. hf-propagation-chart.htm
  167. hf-propagation-explained.htm
  168. hf-propagation-forecast.htm
  169. hf-propagation-map.htm
  170. hf-propagation-prediction-online.htm
  171. hf-propagation-prediction-software.htm
  172. hf-propagation-today.htm
  173. hf-propagation-widget.htm
  174. real-time-hf-propagation-map.htm
  175. real-time-ionosphere-map.htm
  176. understanding-NVIS.htm
  177. understanding-hf-radio.htm
  178. The History of HF Propagation Models 1900s-2025
FAQ
  1. Index of /4/4x4xm//FAQ
  2. At-what-Kp-index-can-I-see-aurora
  3. Blackout of HF communication
  4. Can HF Radio Propagation be predicted?
  5. Compare-DR2W-propagation-tool-with-VOACAP.htm
  6. Compare-HF-Propagation-Solar-Geomagnetic-Space-weather-indices.htm
  7. Compare-forecasting-tools-for-HF-radio-propagation.htm
  8. Compare-forecasting-tools-for-radio-amateurs.htm
  9. Forecasting-tools-for-radio-amateurs.htm
  10. Geomagnetic-Storms.html
  11. Global-and-Regional-HF-propagation-Conditions.htm
  12. Global vs Regional HF propagation-Conditions
  13. What is the difference between the Greyline and the Solar Terminator?
  14. HF Radio Propagation FAQ FAQ directory
  15. HF-radio-propagation-for-radio-amateurs.htm
  16. How are current band conditions?
  17. How Can We Forecast HF Propagation Conditions?
  18. How do I find out what bands are open?
  19. How do radio waves propagate?
  20. How do solar flares cause geomagnetic storms
  21. How do solar storms cause geomagnetic storms?
  22. How do the seasons affect HF radio propagation?
  23. How does space weather affect ham radio?
  24. How does the ionosphere affect HF Radio Propagation?
  25. How long does it take for Solar Wind to reach earth?
  26. How to determine if a band is open?
  27. How to read propagation charts?
  28. Live Solar Events Past Solar Activity
  29. What are Band Conditions Banners?
  30. What are DX clusters?
  31. What are electromagnetic waves?
  32. What are Geomagnetic Disturbances?
  33. What are Geomagnetic Storms?
  34. What are Radio Waves?
  35. What are HF band conditions?
  36. What are ham band conditions?
  37. What are Radio Blackouts?
  38. What are Solar Flares?
  39. What are Solar Storms? How they induce Geomagnetic Storms?
  40. What are sprites in Earth's atmosphere?
  41. What are Sunspots?
  42. What are ionospheric clouds?
  43. What are ionospheric conditions?
  44. What are ionospheric storms?
  45. What are propagation indices?
  46. What are the Solar Indices?
  47. What are the modes of HF Radio Propagation?
  48. What are the most common modes of HF Radio Propagation?
  49. What are the modes of Radio Propagation?
  50. What are-the most common modes of HF Radio Propagation.htm
  51. What factors influence HF Radio Propagation?
  52. What causes geomagnetic storms?
  53. What causes HF propagation?
  54. What causes ionospheric ionization?
  55. What is the Current Minimum Usable Frequency?
  56. What is The Magnetic Field Of Earth?
  57. What is Earth's Magnetosphere?
  58. What is Geomagnetic Activity?
  59. What is a Geomagnetic Disturbance?
  60. What is a Geomagnetic Storm?
  61. What is Grayline propagation?
  62. What is ham radio communications?
  63. What is HF propagation?
  64. What is HF radio propagation?
  65. What is HF radio propagation conditions
  66. What is HF radio propagation prediction?
  67. What is HF wave propagation?
  68. What is ionization, in the context of HF radio wave propagation?
  69. What is LUF?
  70. What is MUF? How to predict MUF?
  71. What is NVIS? » Real-time NVIS Propagation Map
  72. What is radio?
  73. What is Radio Propagation?
  74. What Is Radio Spectrum?
  75. What is Sky Wave Propagation?
  76. What is Skywave Propagation?
  77. What is Solar Activity?
  78. What is solar flux?
  79. What is solar flux index?
  80. What is Solar Wind?
  81. What is Space Weather?
  82. What is the interplanetary magnetic field (IMF)
  83. What is the T index?
  84. What is Total Electron Content?
  85. What is the Current Maximum Usable Frequency (MUF)?
  86. What is the Current Minimum Usable Frequency (LUF)?
  87. What-is-earth's-magnetosphere.htm
  88. What is Ham Radio Propagation?
  89. What is plasma?
  90. What is the solar flux index?
  91. What is the current HF propagation condition?
  92. What is the difference between Global and Regional HF propgation conditions?
  93. What is the difference between earth's magnetosphere and-earth's magnetic field
  94. What is the difference between The Magnetosphere and Earth's magnetic field?
  95. What is the difference between geomagnetic and ionospheric storms?
  96. What is the difference between solar indices and propagation indices?
  97. What is the difference between solar proton flux and solar proton density?
  98. When will HF band conditions improve?
  99. When will HF propagation conditions improve?
  100. When will propagation on HF improve?
  101. Which ham band is open now?
  102. Which ham bands are open now?
  103. Why are ham bands closed?
  104. Why is geomagnetic activity important for ham radio?
  105. Why is HF used for long range communication?
  106. HF Propagation FAQ Root directory
  107. hf-propagation-app.htm
  108. hf-propagation-calculator.htm
  109. hf-propagation-chart.htm
  110. hf-propagation-explained.htm
  111. hf-propagation-forecast.htm
  112. hf-propagation-map.htm
  113. hf-propagation-prediction-online.htm
  114. hf-propagation-prediction-software.htm
  115. hf-propagation-today.htm
  116. hf-propagation-widget.htm
  117. real-time-hf-propagation-map.htm
  118. real-time-ionosphere-map.htm
  119. understanding-NVIS.htm
  120. understanding-hf-radio.htm
ChatGPT
  1. ChatGPT learns about forecasting tools for radio amateurs
  2. Index of /4/4x4xm//ChatGPT
  3. ChatGPT "failure" helped a Radio Amateur
  4. ChatGPT suggested updates for this website 15-April-2023
  5. ChatGPT response: webpage fixed
  6. ChatGPT-review-on-20-July-2025-HF-Propagation.pdf
  7. ChatGPT-review-on-25-July-2025-HF-Propagation.pdf
  8. ChatGPT-review-on-28-July-2025-HF-Propagation.pdf
  9. %d7%a9%d7%90%d7%9c%d7%95%d7%aa-%d7%a9%d7%9c-%d7%97%d7%95%d7%91%d7%91-%d7%a8%d7%93%d7%99%d7%95-%d7%9e%d7%aa%d7%97%d7%99%d7%9c-%d7%91%d7%a0%d7%95%d7%a9%d7%90-%d7%94%d7%aa%d7%a4%d7%a9%d7%98%d7%95%d7%aa-%d7%92%d7%9c%d7%99%d7%9d-%d7%a7%d7%a6%d7%a8%d7%99%d7%9d-%d7%91%d7%aa%d7%93%d7%a8-%d7%92%d7%91%d7%95%d7%94.pdf
  10. ChatGPT%20review%208%20June%202024.txt
  11. ChatGPT Compares forecasting tools for radio amateurs
  12. SUMMARY-Ionopheric%20Layers%20and%20Solar%20Activity%202024-6-14.txt
HF-Bands
  1. Ham band charts
  2. HF bands allocated for radio amateurs and their features
  3. IARU-R1-HF-bandplan-(2019).pdf
  4. Israel-Amateur-Radio-Frequencies-HF-29-9-2024.pdf
  5. RSGB-Band-Plan-13-6-2025.pdf
  6. US-Amateur-Radio-Bands-2-8-2024.pdf
Books, Articles, and Presentations
  1. A Beginners Guide To Radio Propagation, Karl T. Thurber, W8FX (Popular Electronics 1998)
  2. A Primer on Space Weather - NOAA SWPC 2020
  3. A Simplified Model for HF Radio Wave Propagation for Middle East Region - Halid A. Hadi, et al.(2014)
  4. Australian Space Weather Alert System (2024)
  5. Basic Radio Wave Propagation by Nor Hadzfizah Binti Mohd Radi Faculty of Electric & Electronics Eng, Malaysia (2017)
  6. Comparing Ionospheric MUF using IRI16 Model with Mid Latitude—Ala'a A. Al-Shallal, et at., Univ of Baghdad, Iraq (2020)
  7. Correlation Between The Sunspot Numbers and Geomagnetic Parameters for The Solar Cycle 24
  8. Correlation analysis of Solar activity and Cosmic ray; J.Phys.Conf. (2017)
  9. Correlation-of-Sunspot-Numbers-and-Geomagnetic-Indices-with-Various-Climate-Change-Parameters-2024
  10. Critique of IONCAP's Reliability and Service Probability Calculations (1993)
  11. Detection-and-Localization-of-F-layer-Ionospheric-Irregularities-2022
  12. Discover the Magic of HF Radio; Norm Fusaro, W3IZ(2005)
  13. Equatorial-Spread-F_Ionospheric-dynamics-1962
  14. Geomagnetic-storm-and-equatorial-spread-F-2004
  15. High Frequency Communications – An Introductory Overview - Who, What, and Why? by Bill Foose, Harris-Intersil 2012
  16. HF Propagation 2, 4Z1VC Prof Yosi "Yosi" Pinhasi (2025)
  17. HamSCI: Space Weather Operational Resources and Needs of the Amateur Radio Community (2020)
  18. HF Propagation tutorial by Bob Brown, NM7M, Ph.D. from U.C.Berkeley (2007)
  19. Introduction to HF Propagation (Part1) by Rick Fletcher, W7YP (presented at FVARC September 16, 2025)
  20. Introduction to HF Radio Propagation Australian Gov. (2002)
  21. Introduction to HF Radio Propagation Australian Gov. (2007)
  22. Introduction to Ionospheric Modeling; Bruno Nava Presentation (2020)
  23. Ionospheric Propagation; Prof. Sean Victor Hum (2018)
  24. Ionospheric Radio Propagation by Kenneth Davies (1965)
  25. John Ashworth Aatcliffe; 12 December 1902 - 25 October 1987
  26. Modeling the Topside Ionosphere Observations by Satellites (2003)
  27. NOAA’s Space-Based Space Weather Observations (2023) Erin Lynch and Nai-Yu Wang
  28. NVIS: Stephen C. Finch, AI0W (2008)
  29. Noji Article: Understanding the Band Conditions Banner; 2018-12-05
  30. Propagation Modes—Presentation, Ken Larson, KJ6RZ (2024)
  31. Propagation and Radio Science, KL7AJ, ARRL (2005)
  32. Radio Wave Propagation part 1 Introduction Marcel H De Canck ON5AU 2002
  33. Radio Waves and the Ionosphere G3YWX QST 1999
  34. Rebirth of HF by Paul Denisowski, Product Management Engineer (KO4LZ) Rohde & Schwarz 2020
  35. Sky Wave Propagation unknown author ch4 2010
  36. Regional and Long Distance Skywave Communications by Ken Larson KJ6RZ 2025
  37. Solar UV and X ray spectral diagnostics 2018
  38. Skywave Radio Intro Kenneth N. Larson, KJ6RZ (2025-7-11)
  39. Space weather effects on communications systems, June 2020, Mark MacAlester, CISA
  40. Stanley article of the month QST June 2021
  41. Suggested Correlation Formula between High Possible Frequency (HPF) and Optimum Maximum Usable Frequency (OPMUF) over Middle East(2012)
  42. The Big Gun's Guide to Low Band Propagation A book by Bob Brown, NM7M 2002
  43. The Little Pistol's Guide to HF Propagation by Bob Brown, NM7M, Worldradio Books (1996)
  44. The Mysteries of HF Radio-Statewide-Nets-D-Layer-Gordon-Gibby-KX4Z(2020)
  45. The New Dxers Handbook Third Edition, by Bryce K. Anderson, KL7UA, May 2021
  46. Understanding LF and HF propagation by G0KYA, G3NYK; RSGB (2010)
  47. Understanding Propagation by Paul L. Herrman, N0NBH; 11 July 2010
  48. Understanding Propagation by M. Landress, WB5ANN, April 2022
  49. Understanding Solar Indices by Ian Poole, G3YWX - QST - September 2002
Hebrew
  1. שאלות-של-חובב-רדיו-מתחיל-בנושא-התפשטות-גלים-קצרים-בתדר-גבוה.pdf
HAARP
  1. Index of 4x4xm/HAARP
  2. Benefits of the HAARP Project for Radio Hams
  3. HAARP.txt
  4. HAARP Hebrew.txt
  5. HAARP Research Program oriented for radio amateurs
Languages other than English
  1. Arabic التنبؤ بظروف الاتصال لهواة الراديو
  2. Chinese 预测无线电爱好者的通信条件 - 无线电波传播
  3. Dutch Voorspelling van communicatievoorwaarden voor radioamateurs
  4. French Prévision des conditions de communication pour les radioamateurs
  5. GermanVorhersage der Kommunikationsbedingungen für Funkamateure
  6. Hebrew אטמוספירת כדור הארץ והשפעתה על התפשטות גלי רדיו - עברית
  7. Hindi रेडियो शौकीनों के लिए संचार स्थितियों का पूर्वानुमान लहर प्रसार
  8. Italian Previsione delle condizioni di comunicazione per radioamatori
  9. Japanese アマチュア無線家の通信状況を予測する
  10. Korean 아마추어 무선 통신 조건 예측
  11. Perisan Farsi.txt | Farsi-long-text.txt
  12. Portuguese Previsão de condições de comunicação para radioamadores
  13. Russian Прогнозирование условий связи для радиолюбителей распространение волн
  14. Spanish Predicción de las condiciones de comunicación para radioaficionados
Created by Check-domains.com - XML Sitemap Generator. Revised manually by the webmaster.