Last year, Roger Steyaert K7RXV made an interesting presentation to the club on the topic of network analyzers, one of which was a program called EZNEC. He just alerted us to an important announcement from Roy Lewallen, W7EL, about his retirement and plans to release EZNEC to the public domain. If you have ever used EZNEC or thought about using it, you’ll want to check out the details HERE:
Continue reading “Important Changes To EZNEC”Category: Antenna
Basic Antenna Principles Using Antenna Modeling
This program by Mike Mladejovsky WA7ARK was recommended to us by club member Roger Steyaert K7RXV. The presenter is a knowledgeable retired professor. This video starts in the middle of the recording but at the beginning of his presentation.
Smith Chart Basics from Keynight Labs
This video explores Smith Chart basics, and uses that information to learn about the RF performance of a paperclip.
Would this make a good antenna, at what frequencies does it resonate?
A Smith chart makes this really easy to see.
FCC’s 2019 R&O on RF Exposure Standards
UPDATE from Rich K3VAT:
In the last SVARC Zoom Meeting (4/15/2021) during the VP Report, I mentioned that: “The FCC has announced that rule changes detailed in a lengthy 2019 Report and Order governing RF exposure standards go into effect on May 3, 2021. The new rules do not change existing RF exposure (RFE) limits but do require that stations in all services, including amateur radio, be evaluated against existing limits, unless they are exempted. For stations already in place, that evaluation must be completed by May 3, 2023.
Additionally, I mentioned that a large part of future SVARC Program Presentations would be centered around this very important topic because it affects every amateur using any kind of radio transmitter whatsoever. I am currently watching the ARRL.ORG website for updates that will be passed along. For the first presentation on May 6, 2021, I’ve chosen a 20-minute YouTube by Dave Casler, KE0OG.
+++++++++++++++++++++++
Continue reading “FCC’s 2019 R&O on RF Exposure Standards”NEC Co-Author Jerry Burke
Roger Steyaert K7RXV informed us of the sad news that Jerry Burke, co-author of NEC/MOM family of programs about which Roger has given recent presentations on antenna modeling, has died of cancer.
Jerry and A. Poggio wrote the programs at Lawrence Livermore Labs in 1981, under contract to the US Navy. NEC2 was later released to the public and is now available on most computing platforms.
NEC stands for Numerical Electromagnetics Code, and as Roger taught us, NEC2 simulates the electromagnetic response of antennas and metal structures so we can use it to model the performance of our antennas. https://www.nec2.org/.