Internet Linking, Using IRLP & Echolink Extract from the SERA Repeater Journal February, 2003. 

Check out the website at: http://www.sera.org (You will need Adobe Acrobat Reader program, to be able to read a file with an extension of .PDF). 

Ionosphere

The Sun, the Earth, the Ionosphere: What the Numbers Mean, and Propagation Predictions--a brief introduction to propagation and the major factors affecting it. There's more information at http://www.arrl.org/tis/info/k9la-prop.html 

Ionospheric Total Electron Content (TEC)

http://iono.jpl.nasa.gov/latest_rti_global.html 

IRLP Communications

The Official Home of Internet Radio Linking Project IRLP: http://www.irlp.net

IRLP - Internet Radio Linking Project:                

• Official home of IRLP.

• IRLP operating Guideline.

• IRLP Node Status.

• E-Ham on IRLP.