WSPR: pakai raspberrypi dan RTL2832U

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sumber: http://wsprnet.org/drupal/node/6215

Langkah yang perlu di lakukan

  • Raspberri pi dengan Rasbian
  • RTL-SDR Dongles (RTL2832U)

Install aplikasi

sudo su
sudo apt -y install build-essential cmake libfftw3-dev libusb-1.0-0-dev curl libcurl4-gnutls-dev ntp ntpdate git

Install librtlsdr

Sumber: https://github.com/steve-m/librtls

cd /usr/local/src
git clone https://github.com/steve-m/librtlsdr
cd /usr/local/src/librtlsdr
mkdir build
cd build
cmake -DDETACH_KERNEL_DRIVER=ON  ../
make
sudo make install
sudo ldconfig

Install rtlsdr-wsprd

Sumber: https://github.com/Guenael/rtlsdr-wsprd

cd /usr/local/src
git clone https://github.com/Guenael/rtlsdr-wsprd
cd /usr/local/src/rtlsdr-wsprd
make

Setup ntp

crontab -e
*/15 * * * * /usr/sbin/ntpdate id.pool.ntp.org

Run

cd /usr/local/src/rtlsdr-wsprd/
./rtlsdr_wsprd
Use:	rtlsdr_wsprd -f frequency -c callsign -l locator [options]
	-f dial frequency [(,k,M) Hz], check http://wsprnet.org/ for freq.
	-c your callsign (12 chars max)
	-l your locator grid (6 chars max)
Receiver extra options:
	-g gain [0-49] (default: 29)
	-a auto gain (default: off)
	-o frequency offset (default: 0)
	-p crystal correction factor (ppm) (default: 0)
	-u upconverter (default: 0, example: 125M)
	-d direct dampling [0,1,2] (default: 0, 1 for I input, 2 for Q input)
	-n max iterations (default: 0 = infinite loop)
	-i device index (in case of multiple receivers, default: 0)
Decoder extra options:
	-H use the hash table (could caught signal 11 on RPi)
	-Q quick mode, doesn't dig deep for weak signals
	-S single pass mode, no subtraction (same as original wsprd)
Example:
	rtlsdr_wsprd -f 144.489M -c A1XYZ -l AB12cd -g 29 -o -4200


Contoh

cd /usr/local/src/rtlsdr-wsprd
./rtlsdr_wsprd -f 50.293M -c VE2VAX -l FN35JO -a 1 -p 45
./rtlsdr_wsprd -f 3.5926M -c YC0MLC -l OI33KT -d 2 -a 0
./rtlsdr_wsprd -f 7.0386M -c YC0MLC -l OI33KT -d 2 -a 0
./rtlsdr_wsprd -f 10.1387M -c YC0MLC -l OI33KT -d 2 -a 0
./rtlsdr_wsprd -f 14.0956M -c YC0MLC -l OI33KT -d 2 -a 0
./rtlsdr_wsprd -f 18.1046M -c YC0MLC -l OI33KT -d 2 -a 0
./rtlsdr_wsprd -f 21.0946M -c YC0MLC -l OI33KT -d 2 -a 0

Contoh Run

cd /usr/local/src/rtlsdr-wsprd
./rtlsdr_wsprd -f 7.0386M -c YC0MLC -l OI33KT  -d 2 -a 0
Found 1 device(s):
  0:  Realtek, RTL2838UHIDIR, SN: 00000001

Using device 0: Generic RTL2832U OEM
Found Rafael Micro R820T tuner
Enabled direct sampling mode, input 2

Starting rtlsdr-wsprd (2018-01-14, 09:43z) -- Version 0.2
  Callsign     : YC0MLC
  Locator      : OI33KT
  Dial freq.   : 7038599 Hz
  Real freq.   : 7038599 Hz
  PPM factor   : 0
  Gain         : 2 dB
Wait for time sync (start in 16 sec)

No spot
No spot

Freq WSPR

Band Dial freq (MHz)     Tx freq (MHz)
160m  1.836600    1.838000 -   1.838200
 80m  3.592600    3.594000 -   3.594200
 60m  5.287200    5.288600 -   5.288800
 40m  7.038600    7.040000 -   7.040200
 30m  10.138700  10.140100 -  10.140300
 20m  14.095600  14.097000 -  14.097200
 17m  18.104600  18.106000 -  18.106200
 15m  21.094600  21.096000 -  21.096200
 12m  24.924600  24.926000 -  24.926200
 10m  28.124600  28.126000 -  28.126200
  6m  50.293000  50.294400 -  50.294600
  2m 144.488500 144.489900 - 144.490100

Channel bandwidth used is 6 Hz and the transmission time is 110.6 sec. The length of a single tone is 0,6827 s and maximum allowed drift is about 1 Hz.

Beberapa Masalah

  • Gunakan ferrite bead kurangi interference
  • Matikan layar kurangi QRN
  • Buang model yang tidak digunakan
/opt/vc/bin/tvservice -o - Remove unused modules
Edit /etc/modules: #snd-bcm2835) 


Problem USB Port

Rasberian to use with a Raspberry PI I noticed some disconnection problems with USB port while using Raspbian Jessie (2016-05-27-raspbian-jessie-lite.img). I rollbacked to Raspbian Wheezy (2015-02-16-raspbian-wheezy.img) and the problems solved by themself magically... For now, I have not investigated this issue, but if you experience some "Caught signal 11" error message, it could be this same problem. For now, I would recommend Raspbian Wheezy v2015-02-16.

Referensi

Referensi