Comparison Charts for 7-ft CM4251 and 124-in Repurposed "C-Band" Parabolic Antennas analyzed.
Fol. is an On-Line Gain Calculator for Parabolic Antennas, as well as a discussion on Illumination Efficiency: https://www.everythingrf.com/rf-calculators/parabolic-reflector-antenna-gain http://www.w1ghz.org/antbook/chap4.pdf
So there is about a 5 dB Efficiency Loss (at 698 MHz) for the 124-in Parabolic Antenna due to uneven Illumination by the Feed Antennas.
And about a 4 dB Efficiency Loss (at 698 MHz) for the 7-ft CM4251.
Date(s): 24 May 2013. Album by holl_ands. 1 - 4 of 4 Total. 5567 Visits.
enlarge 192KB, 1024x697 1 Compare Various Feeds for 124-in Parabolic UHF Raw Gain
enlarge 167KB, 1024x697 2 Compare Various Feeds for 124-in Parabolic Hi-VHF Raw Gain
enlarge 233KB, 1024x696 3 Compare Separation fm 8-El LPDA to Reflector for CM4251 Parabolic UHF Raw Gain
enlarge 254KB, 1024x696 4 Compare Various Feeds for CM4251 Parabolic
