(照片為本實驗室修正 專用SOFT Radio 板本 並且可做DVB-T ,ISDB-T 全頻道) ..
國外專案位置 http://sdr.osmocom.org/trac/wiki/rtl-sdr
對DVB-T 電視棒Linux 下驅動編寫
http://thread.gmane.org/gmane.linux....61/focus=44461
OSMOCOM 發現最新便宜價廉軟體無線電硬體 RTL-SDR
RTL2832U 是一個應用SDR (軟體無線電的晶片) 非寫死調變演算法的 ASIC
E4000 RF tuner 為(64MHZ - 1700 MHz). (Maybe work in ~2000MHz 這樣才方便做XXX Sniffer)
E4000->沒壓縮的 I+Q基頻->RTL2832U 取樣 丟入電腦做
I+Q 講解
無法接受短波HF 頻帶(1.8MHz到29.7MHz)
解決方法 做塊升頻版
BUG:取樣因為沒buffer問題 所以好像在硬碟會掉包 SSD或ramdisk 會比較理想
RTL2832U晶片規格
http://www.linuxtv.org/wiki/index.ph...alTek_RTL2832U
Notes | |
---|---|
Resolution | 8 bits |
Minimum sample rate | > 900 ksps (must be greater!) |
Maximum sample rate | 3.2 Msps |
Nominal sample rate | 1 Msps (much higher and subtle signal degradation) |
Clock | 28.8 MHz internal oscillator (expect phase noise) |
Spectrum flatness | (Definitely not flat at centre, worse with low gain) |
AGC | Disabled for E4000, but still active somewhere (in demod?) |
Sensitivity | TBD (decent all things considered) |
Quality | Don't expect anything remotely close to USRP |
Price |
E4000 RF IC (零中頻設計)
Funcube Dongle 是用音效卡IC做調變...因此取樣寬度就只有96Khz...
討論
http://www.reddit.com/r/RTLSDR/
https://groups.google.com/forum/#!forum/sdr-widget
HDSDR
HDSDR 是Windows 下軟體無線電軟體 ,可搭配RTL-SDR做RF頻譜訊號檢測
How to
http://thenewtech.tv/community/dongular-deviation
http://wiki.spench.net/wiki/USRP_Interfaces
安裝 http://users.on.net/~balint/HDSDR_install-2.11.exe
GNU radio 教學
安裝gnu radio apt-get install gnuradio
取樣程式
sudo apt-get install libusb-1.0-0-dev
cd rtl-sdr
cd src
make
http://wiki.spench.net/wiki/Gr-baz#rtl_source_c