GROUND WAVE, LINE OF SIGHT

Ground Wave Propagation and Distances -- Via G3CIW

Guide To Transmitter Range Via Artsci

Line Of Sight To The Horizon, Formula & Calculator.

Calculating the Distance To The Horizon

Radio Mobile -- Predict the performance of a radio system -- From VE2DBE

Line Of Sight Transmitter Range

HF PROPAGATION

160 Meter Propagation Discussions

Top Band Propagation

Basics of Radio Wave Propagation

Propagation Primer -- Excellent From AE4RV

W6ELProp™ -- By Sheldon C. Shallon, W6EL - predicts ionospheric (sky-wave) propagation between any two locations on the earth on frequencies between 3 and 30 MHz. 

ON5AU Propagation and Antenna Site -- Loaded with good info and graphs

On-Line HF Propagation Prediction By Serge Stroobandt, ON4BAA

Electromagnetic Wave Propagation By Yuri Blanarovich VE3BMV (K3BU)

D-Region Absorption Prediction - From The NOAA/Space Environment Center

Propagation Center -- Excellent From NW7US, Tomas

Excellent Propagation Info -- By Geoffrey Noles, AE4RV

LONG PATH PROPAGATION

Long Path HF Radio Propagation By Norm Styer - AI2C

Long Path Propagation From KI0EG

VHF/UHF PROPAGATION

ARRL Propagation Classifications for VHF/UHF -- Propagation modes are tropospheric refraction and ducting (including line-of-sight paths), divided into in three categories: 
Tropo (A) (tropospheric modes across the Atlantic, Caribbean, and Gulf of Mexico); 
Tropo (C) (tropospheric modes across continental North America; 
Tropo (P) (tropospheric modes across the Pacific); 
Aurora (auroral scatter); 
Auroral E (auroral E); 
Sporadic E (sporadic E); 
FAI (E-layer field-aligned irregularities; 
IFS (ionospheric forward scatter); 
Meteors (meteor scatter); 
TE (transequatorial field-aligned irregularities); 
Rain scatter (precipitation scatter).

VHF/UHF Propagation -- Excellent Info, Sporadic E, Tropo, Backscatter, Meteor Scatter, Aurora, F2 Skip, more

All About Sporadic-E Propagation at VHF 

A Seven Year Study of 50 mHz Sporadic-E Propagation By Pat Dyer, WA5IYX

6M SPORADIC E & FAI RELATED INFO PAGE -- From K1SIX

VHF/UHF Tropospheric Ducting Forecast -- From William Hepburn

Hawaii Tropo Ducting -- VHF And Above World Records

Non-Ducting Tropo Propagation -- From M1BWR

Tropospheric VHF/UHF DX Modes by William R. Hepburn --  Tropospheric Scatter (TrS), Tropospheric Enhancement (TrE),  Tropospheric Ducting (TrD), Rain Scatter (RS), Ice Pellet Scatter (SS), Aircraft Scatter (AS), Lightning Scatter (LS)

EXPERIMENTAL NORTH AMERICAN 144 MHZ SPORADIC E ALERTING SERVICES

PROPAGATION SUMMARIES, CHARTS, SOLAR FLUX REPORTS

WM7D Propagation Summary -- SFI A and K, Solar Cycle Graph, more

NM5K Propagation Summary -- Current Solar-Terrestrial Conditions

QST HF Propagation Prediction Charts -- MUF, Best Propagation Paths and Times -- PDF Files -- From the ARRL

Solar Flux Graphs --By WN6K, Paul

Latest Solar Report -- Nice Charts and Graphs - From DXLC, Jan Alvestad

Latest Solar Report -- Updated every 5 minutes -- From NOAA Space Environment Center

Space Weather Now - Geomagnetic Storms; Solar Radiation Storms; Radio Blackouts; Latest Alert, Warning, or Watch; Solar Cycle Progression and much much more on Ol Sol

KN4LF Daily Solar Space Weather & Geomagnetic Data Archive

KN4LF Daily HF/MF Radio Propagation Outlook

Propagation From QSL.NET

Solar Activity -- Excellent From Dan, W3DF

27 Day HF Propagation Prediction Chart -- From Paul, AA1LL

PROPAGATION -- Hottest new propagation page on the web. Contains many indicies and reports that are dynamically updated as soon as new information is available. -- From QSL.NET

Propagation Studies Committee - RSGB -- By Martin Harrison G3USF

IPS Support for HF Radio World Wide -- From Australia

Radio Propagation Sources -- From Radio Netherlands

SpaceWeather.com  - A goodie on ol sol

Skywave Technologies -- Propagation Tutorial & Programs

Radio Propagation Conditions From Ham Radio On-Line

ARRL Propagation Forecasts.

Solar flux A & K -- Summaries by calendar quarter --1994 to 1997

Propagation Forecast By AD5Q. -- No Longer Active -- But has 11 Years of Monthly Propagation Reports

Solar flux A & K -- Current Months Solar data -- See -- quar_DGD.txt -- quar_DPD.txt -- quar_DSD.txt

Solar Flux Graphs -- from The CT1BOH Web Site

Solar Terrestrial Activity Report -- By Jan Alvestad -- Recent solar and geomagnetic data (updated daily); Solar WIND and electron fluence charts (updated daily); Solar cycles 21-23, [Solar cycles 1-20; Graphical comparison of cycles 21, 22 and 23

LONG DELAYED ECHO

Long Delayed Echo (LDE) -- From EA6VQ

More On LDE -- From THE WAYBACK MACHINE #31    by Bill Continelli, W2XOY

LDE Reports From The UseGroups

PROPAGATION PRIMER AND TUTORIALS

KN4LF HF/MF Radio Propagation Theory Notes

Basics of Radio Wave Propagation

Propagation Primer -- Excellent From AE4RV

Propagation Glossary -- From The Basics of Radio Wave Propagation Pages

Propagation Topics -- Via The Space Environment Center -- Includes a GLOSSARY OF SOLAR-TERRESTRIAL TERMS

 PROPAGATION  SOFTWARE  

26  HF Propagation Prediction Programs Reviewed -- From Luxorion

ACE-HF --  Professional Propagation Software for HF Radio Operators

DX Toolbox -- From BlackCat Systems -- searches the web for you, gathering information on solar and geomagnetic conditions that affect radio propagation. It also features several propagation forecasting tools. It's ideal for the ham radio operator, shortwave listener, or other radio enthusiast, and is available for Mac OS, Mac OS X, and Windows.

Gray Line Map Program -- By PA3CQR

High Frequency Propagation Models -- U.S. Department of Commerce NTIA/ITS -- About a dozen or so to choose from

IONSOUND HDX or TURBO From Skywave Technolgies

Kangaroo Tabor Software -- WinCAP Wizard, CAPMan, Active Beacon Wizard -- Propagation and Beacon Programs

KU5S -- Communications Analysis Prediction Wizard

MultiNEC 2.0 -- -- Automate and animate your antenna modeling and propagation
predictions -- From AC6LA

PropView uses the included IonCap propagation prediction engine to forecast the minimum and maximum useable frequencies between two locations over a specified 24 hour period

Radio Explorer -- By Dmitry Nefedov -- Graphic viewer for shortwave schedules (ILGRadio and HFCC), displaying data in a tree-like way and on a Gantt.chart.  It also features a world map with greyline and MUF coloring. It is developed in Java and runs on multiple platforms.

Skywave Technologies -- Propagation Tutorial & Programs

VOACAP -- Voice of America - Propagation Prediction Program -- Also see below

VOACAP Quick Guide -- by Jari Perkiömäki, OH6BG -- Free - A half a year's work in understanding how VOACAP really works. It provides easy steps to select the right input values along with discussions and case studies. If you are using ACE-HF, WinCAP Wizard or MultiNEC with VOACAP, this Guide provides you with the basic knowledge so that you can utilize those products to their full capacity.

W6ELProp™ -- By Sheldon C. Shallon, W6EL - predicts ionospheric (sky-wave) propagation between any two locations on the earth on frequencies between 3 and 30 MHz.

    THE   AURORA   PAGES   

The Aurora Page

High Frequency Active Auroral Research Program (HAARP)