70 cm - 3 cm Beacon Antennas 

In 1999 I designed a set of waveguide double-slot antennas for 13 cm to 3 cm beacons and an Alford slot antenna (slotted cylinder antenna) for 23 cm beacon as a part of a "Beacon '99 Project".

The design was published in the "Beacon '99 Project" Proceedings and two PDF files describing those antennas can also be downloaded here:


As a by product the 70 cm beacon Alford slot antenna was designed. Mechanical dimensions are as follows with the reference to the drawing of the 23 cm antenna: