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Andrew Back andrew at carrierdetect.comOn 04/06/2021 15:02, Joachim Steiger wrote: > hi > > limesdr mini does not have a onboard-clock which is good (precise) > enough for gsm requirements. > there is no input which can easily be used with an external source like > a gpsdo. > thus there is no realistic way to reliably do gsm with the -mini, sorry. External clock can be enabled with LimeSDR Mini, but requires moving (soldering) a 0R link and then you always have to use external clock. Daniel Estevez put together a nice write-up: https://destevez.net/2019/11/using-an-external-reference-with-the-limesdr-mini/ Supreeth Herle has also created an LMS API port of Kalibrate, that can be used to calculate and update VCTCXO DAC value in EEPROM: https://github.com/myriadrf/kalibrate-lms This is obviously not as good as having a GPSDO or similar, but may help. Andrew