Tutorial WSPR reception band change with RTLSDR

RaspberryPi and dongle RTL-SDR V.3

• Install WSPRD on your RaspberryPI, for now ,I would recommend Raspian Wheezy 

Tips (for Raspberry Pi)

-Use ferrite bead to limit the interference  -  Cut off the display (could help to reduce QRN) :

/opt/vc/bin/tvservice -o

Remove unused modules

/etc

sudo nano modules 

#snd-bcm2835

• You create new text file in / home / pi of the RaspberryPi and paste this script into it. 

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#!/bin/bash
#
# # # # Edit following variable with your correct data # # # #
call="put your call"
gain="-a 1"
locator="put your locator"
hz="14.0956M"
info_rx="Start reception 20 meters"
# # # # # # # # # # # # # # # # # # # # # # # # # # # # # # ##
    sleep 1
      pgrep rtlsdr_wsprd > /dev/null 2>&1
       if [ $? -eq 0 ]; then
         echo $'\n'"---Kill rtlsdr_wsprd pid---" >> /home/pi/Desktop/wsprd
        killall rtlsdr_wsprd &>> /home/pi/Desktop/wsprd
       fi
         echo $'\n'"$(date)" >> /home/pi/Desktop/wsprd
       echo "$info_rx"$'\n' >> /home/pi/Desktop/wsprd
     sleep 1

   /home/pi/rtlsdr-wsprd/rtlsdr_wsprd -f "$hz" -c "$call" -l "$locator" "$gain" -d 2 &>> /home/pi/Desktop/wsprd &

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• You create other equal files by changing only the reception frequency and then make the files executable with chmod +x 

• The script was created to put a log file on the Desktop of the Raspian operating system called wsprd. If you want to change the path, you change it in the script.

• Now you go to the terminal and type: sudo crontab -e

Here put the band change times

• ...meaning of the contab -e (reception band change times)

• 07:00/13:00 receive 20 meters
• 13:00/16:00 receive 30 meters
• 16:00/17:00 receive 20 meters
• 17:00/21:00 receive 30 meters
• 21:00/23:00 receive 40 meters
• 23:00/02:00 receive 80 meters
• 02:00/07:00 receive 40 meters

Open the terminal and write: ./20m and so the 20 meters script starts, at the set time the frequency changes automatically. After you can also close the terminal. To stop the WSPRD process you write:

killall rtlsdr_wsprd

Thank's also to Biagio IT9FDP

• This tutorial is also on the official blog RTL-SDR.com

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12 hours of reception with automatic band change (20-30-40-80 meters)