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 on solar topics and/or propagation topics, please contact me at k9la at arrl.net.
NEW for mid July 2017 in the Antennas link: Performance Degradation of an LPDA at the Upper End of the Band
NEW for July 2017 in the Monthly Feature link: When the K Index Goes Up
NEW for July 2017 in the VHF link: PhD Thesis on Sporadic E by Christina Arras
NEW in mid June in the RF Power Amps link: Characterizing an RF Power Amplifier with Pin and Pout Data
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 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 firstname.lastname@example.org.