April 28, 2015: Allen Wolff KC7O: J-pole antenna construction
The club has had two previous J-Pole build parties over the past 30 years but never a presentation about the J-Pole, its history and how it works. This month Allen Wolff KC7O presents the above along with a workshop the following Saturday, May 2nd, in the Westminster Church parking lot at 07:00 (N. Lake and Woodbury), where you can build your own 2 Meter J-pole antenna.
What you will need to bring to build the antenna:
- 10 foot piece of ½” schedule L copper pipe
- 2 end caps
- 1 “T” fitting
- 1 elbow fitting
- solder, pipe cutter, gloves, and safety glasses
You can pre-cut the pipe for convenience and ease of transportation. The cut lengths for the three pieces of pipe are:
Length for the support ~12"
A connector assembly consisting of a modified SO-239 connector, 2 stainless steel hose clamps, and a piece of #14 wire soldered to the connector will be available from Allen KC7O for $3 at the meeting. A pipe sizing fixture and holding fixtures for building and testing your J-Pole will be available at the build workshop.
The number of participants in the build workshop is limited to 30. To ensure that everyone understands the antenna and the procedures, participants must be at the meeting to see the presentation and obtain their connector assemblies from Allen.
ARRL Life Member and Extra class licensee Allen Wolff, KC7O, was first licensed as WN2NTL/WB2NTL in New York in 1964, then as WB2NTL in New Jersey, WB9TXP in Indiana, KA7CGN and KC7O in Utah, and KC7O in California. He holds a Bachelor of Science degree in Electrical Engineering, RF Communications from Drexel University, Philadelphia PA.
Allen has over 45 years’ experience in aerospace manufacturing operations and quality management. He has worked on the Lunar Module Apollo missions 9 through 14, military communications systems, the MX missile guidance system, commercial and military aircraft hydraulic actuators, spacecraft deployment systems, titanium fuel tanks for satellites and launch vehicles, and Radio Frequency Identification (RFID) systems. He is currently semi-retired and a management, engineering and quality consultant.
He supports the local police by leading the Sierra Madre Emergency Communications Team and is a member of the Pasadena Radio Club. He enjoys travel, photography and camping and for the past eight years has been a 1B Field Day station.
In 1999 he was awarded the Herb Brier Instructor of the Year award from the ARRL for 17 years of teaching Novice and Technician classes accounting for at least 450 new Ham Radio licenses.