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I began writing the monthly Propagation column in WorldRadio in January 1997, when I took over from Bob Brown NM7M (SK). When I started, WorldRadio was a printed magazine. WorldRadio turned into a digital magazine with the February 2009 issue. When WorldRadio was bought by CQ, my column turned into Practical Propagation beginning with the February 2014 issue, and was in the monthly supplement to CQ titled CQ Plus.
CQ Plus ceased publication in early 2015, but I continue to write a monthly feature (beginning with the January 2015 feature) that will be posted here on or around the first of every month. If you enjoy reading my material or have a suggestion for a topic, please let me know at k9la@arrl.net.
Sep21 Tropospheric Ducting on 2 Meters
Aug21 Ionospheric Absorption
Jul21 Digging Deep Into VOACAP With Respect to 6 Meters
Jun21 Space Weather Parameters and Propagation - revised 1Jun2021
May21 A Duo-Band 6m and 2m Antenna
Apr21 More on Propagation vs Location
Mar21 A Very Broad Look at Propagation vs Location
Feb21 The Advantage of the NEC-4 Engine
Jan21 Interesting Trans-Equatorial Propagation (TEP) on 6 Meters
Dec20 ZD7FT on 10m and Comments on Big Cycle 25 Prediction - Rev 1 and Rev 2
Nov20 Late Afternoon Openings in the Fall Months to Scandinavian Countries on 15m and 10m
Oct20 More on Solar Minimum Terminology
Sep20 The Future of Propagation Predictions
Aug20 Cycle 25 Predictions
Jul20 Pop Quiz
Jun20 Effect of a Traveling Ionospheric Disturbance at YK9A
May20 Bonus - Sunspot Number Confusion
May20 The Importance of Contest and DXpedition Logs
Apr20 Winter Nights at Solar Minimum - When NVIS Really Shines
Mar20 A Paradigm Shift
Feb20 Cycle 25 Sunspots
Jan20 Three Short Subjects
Dec19 VK4YB to NO3M on 630m and 2200m
Nov19 Problems with Ionosonde Data
Oct19 Off-Center Fed Dipole for 80m and 40m
Sept19 Solar Eclipse of August 2017
Aug19 PMSE Update 2019
Jul19 The SWPC's Prediction for Solar Flux
Jun19 What to Expect at Solar Minimum
May19 Catch a Wave
Apr19 Revisiting Low Band Propagation During a Full Moon
Mar19 The Earth's Magnetic Field Attracts Confusion
Feb19 Dip in foF2 Before Sunrise
Jan19 Generalities and Unusual Observations
Dec18 Propagation on 630m and 2200m - revised 24Dec2018
Nov18 Different MUFs in Our Prediction Programs
Oct18 Propagation Predictions and the New Sunspot Numbers
Sep18 Antenna Measurements Part 2
Aug18 Antenna Measurements Part 1
Jul18 Elevation Angles Required for 6m Sporadic E
Jun18 Distance-Based Scoring for Contests
May18 Solar Minimum and Spotless Days
Apr18 Using VOACAP to Predict FT8 Propagation
Mar18 Above-the-MUF Propagation and JT65-FT8 Advantages over CW
Mar18 Bonus - Analysis of an FT8 6-Meter QSO - revised Oct 2018
Feb18 Generating Circular Polarization at HF in the Real World
Jan18 160m Skewed Path - K7ZV to UA4HBW
Jan18 Bonus - Electron Density Changes During Geomagnetic Storms
Dec17 Readily Available Propagation Predictions for DXpeditions
Nov17 NEW Sunspot Numbers - But There's a Chink in the Armor
Oct17 Atmospheric Noise with Horizontal Antennas
Sep17 Long Path-Short Path Switching on 15-Meters Part 2
Aug17 Long Path-Short Path Switching on 15-Meters Part 1
Aug17 Bonus - What Mode of Propagation Enables JT65-JT9-FT8_Revision 1
Jul17 When the K Index Goes Up
Jun17 Stratospheric Warmings Revisited
May17 Thinking in 3-D
Apr17 Long-Term Propagation Planning
Mar17 A Blast from the Past - The DX-O-Graph
Feb17 DXing on Mars
Jan17 Sunrise Sunset and Daylight in Relation to Low Band Propagation
Dec16 VE7SL to VK4YB on 630-Meters - Revised May 2017
Nov16 A Look at the 160-Meter QSOs of VK9LL
Nov16 Bonus - KRSL AM 990 KHz to Finland
Oct16 CY9C 6m Opening
Oct16 Bonus - Earthquakes and the Ionosphere
Sept16 Antenna Interaction Rev A
Sept16 Bonus - Tracking Solar Eruptions to Their Impact on Earth
Aug16 W3 to HS Via Long Path on 20m
Jul16 Long Term Trends in Sporadic E Occurrences
Jun16 Operating Near the Equator
May16 Notes on Low-Noise Receive Antennas
Apr16 NEW Sunspot Numbers
Mar16 Worldwide Critical Frequency Maps - What They Tell Us
Feb16 Development of the Model of the Ionosphere with Feb 2017 Update
Jan16 Selective Propagation on 10-Meters
Dec15 Circular Polarization - Is It Worth the Effort
Nov15 A Rule of Thumb for Antenna Gain vs Height
Oct15 Extreme DXing
Sep15 An Interesting Night on 40m and 160m
Aug15 K1FK to JA Via 160m via Long Path_revised
Jul15 A Review of Magnetic Indices
Jun15 When Does A Layer Ionize
Jun15 Bonus - My DX Summit
May15 What's Going On with 160-Meters
Apr15 Where Was 6m F2 In October 2014
Apr15 Bonus - Worldwide Thunderstorm Occurrences
Mar15 Cycle 24 Is In Uncharted Territory
Mar15 Bonus - Some Definitions and Comments
Feb15 One-Way Propagation Revisited
Jan15 Two Interesting Issues Tied to 160-Meter Propagation
Dec14 Another Quest for 5BWAZ
Nov14 17-Meter Morning Long Path
Oct14 Monitoring Beacons with FAROS
Sep14 The Santa Claus Polar Path
Aug14 Cycle 24 Update - Second Peak
Jul14 Skewed Path to FT5ZM on 10-Meters
Jun14 Update On Disappearing Sunspots
May14 Over The MUF_Es Probablities_Pedersen Ray
Mar-Apr14 The Concept of Monthly Median Predictions
Feb14 Why We Need Smoothed Solar Indices - Part 2
Jan14 Why We Need Smoothed Solar Indices - Part 1
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