The RF testing of a device needs to be done in a controlled manner. The testing of an nRF9160 based device, for example, the enabling of an LTE transmitter at a certain channel, can be controlled in two ways:
The non-signaling mode bypasses the LTE signaling protocol and is intended to be used only in controlled test environments. nRF9160 has inbuilt AT commands enabling the most relevant test modes for conductive and radiated tests for R&D and production. For more information about RF performance related test modes and other supported test capabilities, see nRF91 AT Commands Reference Guide.