A few weeks ago I posted about a new Chinese ham radio satellite, and mentioned a couple of satellite antennas I was considering building. Just a few days later I found the latest QST magazine in my mailbox, complete with an article about (you guessed it) another ham radio satellite antenna project! This one, by AA2TX, describes an antenna he calls a parasitic Lindenblad (here’s a link to an AMSAT article). The antenna, for 70 cm, is right-hand-circularly polarized with an omnidirectional radiation pattern. This makes it well-suited to amateur satellite applications. I liked this design better than some of the others I was considering, so I decided to give it a whirl.
So last weekend I was at the local Ace Hardware store with a list of parts in my hand. This list included items like:
- 1/2″ x 1/2″ gray PVC insert connector
- 1/2″ x 1/2″ gray PVC insert-to-threaded adapter
- 12″ x 1/2″ threaded gray PVC riser
- 5″ x 1/2″ gray PVC ferrules for spacing rain gutter nails
- 1/8″ aluminum tubing
- conductive grease
Some pretty obscure stuff, eh? I wasn’t having much luck finding the ferrules, so I enlisted one of the employees (an older guy) for some help. I showed him my list, and he squinted at it for a moment. Then he turned to me and asked, “Are you building an antenna?”
I laughed, “Yeah–how’d you know?” He chuckled and replied that another guy had been in the store recently with the same list. What are the odds of that? At any rate, he helped me round up the rest of the parts I needed, and construction begins today. I’ll post again with the results of the effort and my impressions of its performance.