Looks like a standard 8 turn, axial mode, helix to me.
see https://en.wikipedia.org/wiki/Helical_antenna#Axial-mode_helical
Looks like about 8 dBi gain.
73 Glenn WB4UIV
On 5/7/2018 6:57 PM, Steve Bossert via AMSAT-BB wrote:
I am curious about the helical antenna in the article just released late last month: https://www.nasa.gov/feature/goddard/2018/nasa-upgrades-space-station-emerge...
This one: https://www.nasa.gov/sites/default/files/thumbnails/image/upgradedvhf-antenn...
While I await a reply from the article author, I wonder if anyone may have some details on this antenna. Looks like a good candidate as a functional lawn ornament that is not another QFH for more garden modern art satellite installation. I would like to author a construction and theory article for the HVDN.org website in the "notebook" section.
Thanks, Steve Steve Bossert [email protected] 914-573-1799 _______________________________________________ Sent via [email protected]. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb