簡單來說你可以用簡單便宜的這個專案來啟發你的“無線電觀察”

https://learn.adafruit.com/freq-show-raspberry-pi-rtl-sdr-scanner/overview

想要知道你周圍有哪些無線電訊號嗎？  Software-defined radio (SDR)你可以透過 軟體感知 無線電

簡單來說你可以用簡單便宜的這個專案來啟發你的“無線電觀察” 

其他偵測硬體  HackRF 讓你可以有更大的範圍 ,

你可以簡單的使用 Raspberry Pi   RTL-SDR 做

HackRF PortaPack, ...

 Software-defined radio (SDR) 

FM radio, television, emergency & weather radio, citizen band (CB), 

 much more.  

 HackRF 

 inexpensive RTL-SDR tuner.

 HackRF 

PortaPack,

 PiTFT

RTL-SDR 

在開始之前你需要下列背景能力:

• Circuit Playground: F Is For Frequency 
• Getting Started With RTL-SDR and SDR#
• FFT: Fun with Fourier Transforms
• PiTFT 3.5" Touch Screen For Raspberry Pi
• Raspberry Pi: Using SSH

Also for some inspiration on what you can do with SDR, check out these excellent presentations from previous DEF CON conferences: