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====== 6. Problems and possible solutions ======

  * Nothing happens:
    * Check power supply. Test with another (USB) cable
    * Remove the SD card and insert it again
  * at start, it beeps a few times (long long long), the red LED flashes and everything repeats again
    * Unplug the RTL-SDR and connect it again
      * if the problem persists, unplug and reconnect power
  * New results aren't written, it is defective
    * exchange the storage medium, recommended is an SD card - used through an USB adapter
      * format with the //Flash Friendly File System// to extend its lifetime: ''scanner_format_f2fs.sh''
  * Raspberry Pi is no longer accessible after pressing the reboot knob
    * sometimes the system hangs on reboot. Remove power and reconnect
  * Bad reception quality
    * check the antenna connection and plug as well as the location of the antenna!
    * is the //gain// set correctly?
    * metallized vehicle window pane?
  * the scanner freezes after a while
    * apparently, the RTL dongle is not particularly stable
    * automatic reboot with the setting ''FMLIST_SCAN_DEAD_REBOOT = "1"''
      * if necessary, also the setting ''FMLIST_SCAN_DEAD_TIME'' reduce, e.g. to 240.
  * Stations are not recognized or decoded. There can be various reasons for this. The best way to assess the specific cause is based on a recording.
    * utilities for recording are ''recWFMchunk.sh'' and ''recDAB.sh''. Please use these to create and provide recordings of 10 to 30 seconds.
  * the buzzer is too loud and may be annoying too often
    * configure the cases, which should be signalled - or not.
    * the buzzer's hole can be partially or completely glued with an adhesive tape
    * if you don't want to hear anything, it is simple to pull off one of the 2 pins
      * pay attention to the polarity when re-attaching: (+) symbol on the piezo
  * after disconnecting the Ethernet cable, the WiFi SSH / PuTTY session also freezes
    * that is a known issue. do not use the Ethernet cable for WiFi operation
  * the Raspberry Pi reboots quite often
    * check the power supply unit or try another sufficiently dimensioned power supply

For other or persistent problems, please check the mailing list first: https://groups.io/g/fmlist-scanner \\ 
Register and mail to [[fmlist-scanner@groups.io|fmlist-scanner@groups.io]]

This list will also be used to provide further information about new versions / updates or questions / answers on your part in the future. Additional photos, links and wiki pages are also available via the mailing list website.