In CONFIG.H folgendes einstellen :

// Allow for the use of high quality external clock oscillators
// The number is the frequency of the oscillator in Hertz.
//
// The frequency of the TCXO must be an integer multiple of 48000.
// Frequencies such as 12.0 Mhz (48000 * 250) and 14.4 Mhz (48000 * 300) are suitable.
// Frequencies such as 10.0 Mhz (48000 * 208.333) or 20 Mhz (48000 * 416.666) are not suitable.
//
// For 12 MHz  high accurate TCXO 
 #define EXTERNAL_OSC 12000000
// For 12.288 MHz
// #define EXTERNAL_OSC 12288000
// For 14.4 MHz
// #define EXTERNAL_OSC 14400000
// For 19.2 MHz
// #define EXTERNAL_OSC 19200000

// Allow the use of the COS line to lockout the modem
// #define USE_COS_AS_LOCKOUT

// Use pins to output the current mode
// #define ARDUINO_MODE_PINS

// For the original Arduino Due pin layout 
// #define ARDUINO_DUE_PAPA

// For the ZUM V1.0 and V1.0.1 boards pin layout  (mein altes)
 // #define ARDUINO_DUE_ZUM_V10

// For the SQ6POG board
// #define STM32F1_POG

// For the SP8NTH board
 #define ARDUINO_DUE_NTH

// For ST Nucleo-64 STM32F446RE board
// #define STM32F4_NUCLEO_MORPHO_HEADER
// #define STM32F4_NUCLEO_ARDUINO_HEADER

// Use separate mode pins to switch external filters/bandwidth for example
// #define STM32F4_NUCLEO_MODE_PINS

// Pass RSSI information to the host
// #define SEND_RSSI_DATA

// Use the modem as a serial repeater for Nextion displays
// #define SERIAL_REPEATER