Welcome to K9LA’s Amateur Radio Propagation Web Site

Carl Luetzelschwab K9LA

    I retired in early October 2013 after 41 years as an RF Design Engineer with Motorola and Raytheon (formerly Magnavox).

    If you’d like me to give your local club a presentation via Skype or Zoom on solar topics and/or propagation topics, please contact me at k9la at arrl.net.

NEW for February 2020 in the Monthly Feature link: Cycle 25 Sunspots

On 17Feb2020, updated the solar minimum plot in Timely Topics

Reminder: Name That Core (a short article that hopefully will allow you to identify your unknown ferrite cores) is in the General link

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.

Reminder: NM7M’s book titled “Long Path Propagation” is in the General link.

Reminder: NM7M’s book titled “Long Path Propagation - Revisited” is in the General link.

Reminder: NM7M’s book titled “On Ion Chemistry and 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 and presentations about propagation and solar topics from my monthly Practical Propagation column in CQ Plus (formerly WorldRadio), from my contributions to other Amateur Radio publications, and from shows I’ve given. These items are grouped into Monthly Feature, Timely Topics, Basic Concepts, Tutorials, General, 160m, HF, VHF, Contesting, Webinars and DXU presentations. Just click on the link on the left to navigate to these areas.

You can also read about my early Novice days at the My Novice Days link, my aviation days at the Aviation link, RF power amplifier topics in the RF Power Amps link and antenna topics in the Antennas link and the Rcv Antennas link. Also check out some of my early “detective” work in the WN9AVT Mystery link.

My wife Vicky AE9YL and I have been on several DXpeditions (YK9A, OJ0, and many trips to ZF as ZF2LA and ZF2YL). I am on the Top of the Honor Roll (worked all current DXCC entities), have 160-Meter DXCC and need four zones on 80-Meters for 5BWAZ.

You can contact me at k9la@arrl.net.

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