This is only the proof-of-concept prototype.
I have been cooking a design for a backpackable 4-element Yagi antenna for some time now.
The basic idea is to make a telescopic boom out of two PVC pipes and have removable elements that store inside it.
It took me some time to figure the method of attaching the aluminum welding rod elements (used Kosh electrical connectors) and how to integrate the feed point inside the boom. This will be the next build step.
I went through several Yagi designs and calculations but I finally found a workaround to impedance matching. A recipe/design calculated to be a 50-ohm one from the start.
It is the 100 grams 4 elements VHF Yagi-Uda by IZ2UUF.
Temporarily assembled on a target stand pole.
For the purpose of testing and hoisting the antenna above ground, I screwed another piece of wood on a 90 degree angle, to balance the antenna vertically. Hoists were 3 pieces of cord with a tautline hitch 😉 adjusting their length for balance.
I cut the elements to the final length right on the spot by consulting the SWR Meter. I started with 1.31 at 145 MHz and by removing some length I got 1.18 @ 145 MHz, 1.47 @ 142 MHz and 1.56 @ 149MHz. A fellow ham 50 miles away gave me a 5-9 RST.
It was a nice day, with coffee, sunshine and a non-HAM friend to help me. Who was flabbergasted by the process and what a few humble materials can do.
Thank you for reading. If you liked it, please help this blog grow by Following and Sharing.