WSPR: pakai raspberrypi dan RTL2832U

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
./rtlsdr_wsprd -f 7.0386M -c YC0MLC -l OI33KT
./rtlsdr_wsprd -f 10.1387M -c YC0MLC -l OI33KT
./rtlsdr_wsprd -f 14.0956M -c YC0MLC -l OI33KT
./rtlsdr_wsprd -f 18.1046M -c YC0MLC -l OI33KT
./rtlsdr_wsprd -f 21.0946M -c YC0MLC -l OI33KT

Contoh Run

cd /usr/local/src/rtlsdr_wsprd
./rtlsdr_wsprd -f 7.0386M -c YC0MLC -l OI33KT

Found 1 device(s):
  0:  Realtek, RTL2838UHIDIR, SN: 00000001

Using device 0: Generic RTL2832U OEM
Detached kernel driver
Found Rafael Micro R820T tuner
[R82XX] PLL not locked!
[R82XX] PLL not locked!

Starting rtlsdr-wsprd (2018-01-13, 03:58z) -- 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 92 sec)

Freq WSPR

   0.136
   0.4742
   1.8366
   3.5926
   5.2872
   7.0386
  10.1387
  14.0956
  18.1046
  21.0946
  24.9246
  28.1246
  50.293
  70.091
 144.489
 432.300
1296.500

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

• http://osmocom.org/projects/sdr/wiki/rtl-sdr

Referensi

• http://wsprnet.org/drupal/node/6215