Two nRF5340 close to each other

[Adm]

Hello,

I'm planning to work on a device which should have two nRF5340 modules on a small PCB (they will be max 2cm apart from each other). Both modules will broadcast data over BLE (using Bluetooth LE GATT Nordic UART Service).

Is this possible, will there be a significant interference between those two? Is there anything that I should consider before going into this?

[Kenneth]

It's not a problem to have two radios on the same board in close proximty if they are only transmitting, however if one want to transmit while the other is in receive mode. It is very unlikely the recieving radio will be able to receive anything due to the high interference source from the transmitting radio. Effectively this will reduce the sensitvity of the receiver while the transmitter is actively transmitting. The closer they are in the frequency in the 2.4GHz band, the more reduction in sensitivity will the nearby radio experience. It's difficult to give any numbers in the terms of range reduction here, since it depends on so many factors that is unknown.

Kenneth