32Mhz external crystal is used for 2.4G transfer and receiver?

[james]

Hi,

    We have a product which was developed with nRF52810.We found Samsung cellphone M31 couldn't  scan the broadcast of nRF52810 with nRF Connect, but ther cellphone  could scan and connet it with nRF connect. Samsung cellphone could scan the broadcast of nRF52810 and connet it after we changed 32Mhz +-20ppm crystal to 32Mhz +-10ppm crystal. We want to know 32Mhz crystal can affect 2.4G transfer or receiver, and if it does how can 32Mhz crystal affect 2.4G transfer or receiver.

[ketiljo]

You don't need to test each and every device this way but it's a good way to test the prototype for the correct load cap value. But you should test the radio on each product to make sure the load caps are correctly mounted etc. Thus can be a simple connection test.

The offset in the 32 MHz crystal frequency scales with the ratio between the carrier and the crystal freq. The difference in ppm is the same, but not Hz. For example, If you have a 30 ppm error in the 32 MHz clock, the carrier will have the same offset.  This corresponds with a 960 Hz offset for the 32 MHz clock but a 72 kHz offset for the carrier. 

The frequency of the crystal can only be changed of you change the load caps for the crystal. There's no way to change it by SW.

[james]

Thank you.It helps me a lot.