QFH 137MHz天线

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发布时间：2024/1/20 14:25:00

This is a quadrifilar helicoidal antenna structure serving as a base for building a 137MHz NOAA satellite reception antenna.
Computatio were done using Mr. John Coppe QFH antenna online calculator (thank you very much!) :
Edit 2015-04-11 :
Added a picture received today with the antenna (no amplifier, only the antenna connected to the SDR RTL2832U dongle :-) )