Quadrifilar Helix Antenna Cross Arms Drill Guide

These drill guides were designed in order to create a Quadrifilar Helix Antenna (QFH) using an infinite balun design tuned to 137.5 MHz for the NOAA 19 Satellite as described below:

Original Build Guide:
http://www.qsl.net/yo4tnv/docs/ARRL%20UHF%20Microwave%20Projects%201997.pdf (Page 1-39)

Step by Step instructions:
http://www.rish.kyoto-u.ac.jp/digitalbeacon/information/Building_QFH_Antenna_Guide.pdf


Dimensions of Pipes Used:

Center Column:

2 inch PVC pipe with an outer diam