View source for 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

==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