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

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.