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Monthly Feature

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

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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