Thingy: 91 Development board RF frequency band issue

[Zeliang Jiang]

Due to the size limitations of the equipment, it is difficult to operate the low-frequency range of 700Mhz to 960Mhz for cellular antennas, and it is necessary to switch them through a harmonic switch.

There are two communication methods between nrf9151 and the RF harmonic switch: GPIO and MIPI. nRF9151 controls this communication automatically by the modem, and users cannot modify it by themselves. The current solution selection of the customer is based on thingy: The reference design for 91 is QM13345. nRF9151 communicates with QM13345 through the MIPI interface. Now, we need to know what frequency bands QM13345 RF1/RF2/RF3/RF4 correspond to respectively?

[JONATHAN LL]

Now, we need to know what frequency bands QM13345 RF1/RF2/RF3/RF4 correspond to respectively?

Are you asking what frequencies are used for RF1/RF2/RF3/RF4 on the Thingy91 design?

The QM13345 is controlled from the nRF9151 MIPI RFFE interface. The MIPI RFFE interface is configured with AT commands,  see https://docs.nordicsemi.com/bundle/ps_nrf9161/page/ip/radio_lte/doc/magpio_if.html and https://docs.nordicsemi.com/bundle/ref_at_commands_nrf91x1/page/REF/at_commands/sip_pin_configuration/xmipirffedev.html. 


Regards,
Jonathan

[Zeliang Jiang]

Hi Jonathan，

Yes, we need you to provide the specific frequency bands corresponding to each port of RF1/RF2/RF3/RF4. These two links do not show them.

[JONATHAN LL]

Hi, 

Here is an update, 
 

You can find the commands used here under the board files: https://github.com/nrfconnect/sdk-nrf/blob/de22712c117fa866bdf697697e97230ce51bdd0d/boards/nordic/thingy91x/Kconfig.defconfig.nrf9151#L83 


Regards,
Jonathan