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Adafruit Feather M0 RFM69HCW Packet Radio - 868 or 915 MHz [RadioFruit] : ID 3176 : $24.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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![20 MHz is the lower edge of the Ionospheric window for the decametric... | Download Scientific Diagram 20 MHz is the lower edge of the Ionospheric window for the decametric... | Download Scientific Diagram](https://www.researchgate.net/publication/355652375/figure/fig3/AS:1083410697199623@1635316647775/20-MHz-is-the-lower-edge-of-the-Ionospheric-window-for-the-decametric-radio-band.jpg)