Friday, March 17, 2017
Ascension Lutheran Church 1220 West Magee Road, Tucson, AZ
Presented by Tom, W8TK
"Build your own test equipment"
Presented by Gary Thiele, KD8ZWS
The Yagi-Uda antenna was invented in Japan in 1926 and saw use in early WWII as a VHF radar antenna. In 1943 the (classified) invention of the Magnetron enabled the Allies to develop airborne radar at centimeter wavelengths (for which other antennas were more suitable). The technological advance of allied airborne radar contributed significantly to the demise of the German U-boats. After the war, the Yagi-Uda became a favorite Ham antenna.
The talk, in four parts, will: 1) trace the historical development and use of the Yagi-Uda; 2) reflect on some personal experiences; 3) review some antenna basics; 4) conclude with a brief technical discussion that will show why the director and reflector elements are configured as they usually are, and why the antenna has narrow bandwidth, among other characteristics.
Gary Thiele is co-author of the book “Antenna Theory & Design,” Wiley 1981, 1998, and 2013 (822 pages). The text serves both the academic market and industrial users.
OVARC Field Outing to Fairbank Ghost Town - March 18, 2017
We will gather at at 9 AM on March 18 at an Arizona ghost town, Fairbank (https://www.blm.gov/az/st/en/prog/cultural/fairbank.html), which is about 10 miles west of Tombstone. Mapquest tells me the drive takes 93 minutes from my home in Tortolita. There are dozens of ghost towns in Arizona but most are only a memory. Fairbank had the train depot that served the Tombstone area and it was abandoned around 1972, but some buildings remain and the history is well documented on the website.
As always, we’ll have 100 watt HF radio and antenna, battery power, table, shelter, and logging computer. Bring your lunch and a chair. We’ll operate as long as anyone wishes to do so, on CW, SSB, PSK, and RTTY, probably on 40, 20, and 15 meters, whichever is open at the time. New operators are encouraged to attend and old timers will be on hand to provide guidance and advice on any ham-related topic. The only way to defeat mic fright is to get on the air and talk! We will help.
Here is more information about Fairbank:
The Oro Valley Amateur Radio Club is an Arizona Non-Profit Corporation.
Club meetings are held on the 3rd Friday of each month at 7:00 PM at
Ascension Lutheran Church
1220 W Magee Rd
Tucson, AZ 85704
You do not have to be a member of OVARC to attend.
Board Meetings are held at 9:00am MST on the 1st Saturday of each month at
Oro Valley PD Emergency Operations Center
1920 E Tangerine Rd.
Oro Valley, AZ
Changes to Board meeting times will be published on this website 24 hours prior to the new meeting time. Board meetings are open to the public.