Over the last couple of months I’ve been having a lot of fun with 3D
printing and design, working to make a 70cm parasitic Lindenblad that is
easy to manufacture and assemble. I’d like to share the design files with
the amateur community, inviting people to build and improve on this design.
This design heavily leverages the previous excellent work by Tony Monteiro
(AA2TX), who created and published the paper: “A Parasitic Lindenblad
Antenna for 70cm” AMSAT Proceedings 2006. The AA2TX design uses a central
driven dipole surrounded by four tilted parasitic elements.
One of the biggest challenges to construct the AA2TX design is holding the
parasitic elements in the crazy geometry defined by a Lindenblad
configuration. The AA2TX design used irrigation parts, requiring careful
alignment by hand and tedious bonding operations. Today with the
availability of 3D printing it is possible to remove literally all the
critical alignments, designing these spacings and angles into the 3D
Design files, pictures and construction notes can be found on Thingiverse
(search for my call sign K7ZOO). I welcome any ideas for improvement and
would really enjoy seeing the results of any construction efforts.