Welcome to K9LA’s Amateur Radio Propagation Web Site

Carl Luetzelschwab K9LA

    Now retired after 41 years of RF Design with Motorola and Raytheon (formerly Magnavox). Visit the new RF Power Amps link for topics related to RF power amplifiers.

    If you’d like for me to give a presentation on solar topics and/or propagation to your local club via Skype, just let me know (k9la@arrl.net).


NEW on 30 March 2014 in the 160m link - “Arrival Direction of FT5ZM in NA on 160m - Rev C”

Reminder: W6ELProp executable file is in the Tutorials link (the www.qsl.net link does not work as of June 2013)

Reminder: NM7M’s book titled “The Big Gun’s Guide to Low-Band Propagation” is in the 160m link.

Reminder: NM7M’s book titled “The Little Pistol’s Guide to HF Propagation” is in the General link.


I have been licensed since October 1961 (my Novice call was WN9AVT). My interest in propagation goes back to my college days at Purdue University (BSEE 1969, MSEE 1972).

This web site contains selected articles about propagation from my monthly Propagation column in WorldRadio (now WorldRadio Online) and from my contributions to other Amateur Radio publications. These propagation articles are grouped into Timely Topics, Basic Concepts, Tutorials, General, 160m, HF, VHF, Contesting, and Webinars. Just click on the link on the left to navigate to these areas.

You may also read about my early Novice days at the WN9AVT link, and my airplane days at the Aviation link.

You can contact me at k9la@arrl.net.

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