AB7E L-Band Helical Antenna System for INMARSAT Satellites

In this video I try to describe how to build your own inexpensive helical antenna for receiving transmissions from the INMARSAT satellites operating in the vicinity of 1.5 GHz. I also describe an azimuth/elevation system for remotely pointing the antenna. I'm a lot better at making antennas than I am making videos, so please take that into account while you're watching.

The design and dimensions for the antenna are derived from this website:

http://jcoppens.com/ant/helix/calc.en.php

Materials used in the construction include:

12" x 18" x 3mm polycarbonate sheet ---- https://www.amazon.com/dp/B07JJFV3DB?ref=ppx_yo2ov_dt_b_fed_asin_title

SMA panel mount connector ---- https://www.amazon.com/gp/product/B09MVYNZ29/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1

12 volt azimuth servo ---- https://www.amazon.com/dp/B0CXLM953C?ref=ppx_yo2ov_dt_b_fed_asin_title

12 volt elevation servo ---- https://www.amazon.com/dp/B0CP126F77?ref=ppx_yo2ov_dt_b_fed_asin_title

servo testers ---- https://www.amazon.com/dp/B00LTOD4F4?ref=ppx_yo2ov_dt_b_fed_asin_title

STL file for 3D printing the disc spacers ---- https://www.printables.com/model/1061527-spacer-for-l-band-helical-antenna

One thing missing from the video is that INSIDE EDGE of the holes in the polycarbonate strips are drilled 12 mm from the edge of the strip closest to the center of the antenna.