Configuring a specific transmitted power with nrf9161

[Azaro]

Hello, I would like to know if the system in package nrf9161 integrated in the thingy-91x can be configured to transmit on a particular channel and at a specific power. And with the development kit?

[Charlie]

Hi Adrian,

You can find nRF9161 specification here.  nRF9161's LPWA network processor can operate as a 5G DECT NR+ (NR+) device, independent of cellular network provider or as an LTE modem compliant with 3GPP LTE release 14 Cat-M1 and Cat-NB1/NB2 standards. It integrates a flexible transceiver with frequency range 700 MHz to 2200 MHz, through a single 50 Ω antenna pin and a baseband processor. NR+ or LTE operation is supported depending on which network protocol firmware the customer installs on the LPWA network processor of the nRF9161. 

Can you further explain about your application? Is it related to DECT NR+ or your own custom low layer design?

Best regards,

Charlie

[Azaro]

Hello Charlie,

Thank you for responding so quickly. What I want to do is determine the radiated power that the device transmits in different environments while working with NB-IoT. For this purpose, I need to configure a continuous signal to a specific power. I would also like to be able to change that power in real-time (increase it) in case of antenna mismatch.

Is it possible to do this with the two devices I mentioned earlier?
If so, how is it done?

Thank you for your attention!

Adrian

[Charlie]

Hi Adrian,

This is not possible. nRF9161's maximum radiation output power is 23 dBm.

The radiation output power is decided by modem and cell station, which following 3GPP specifications on NB-IoT/LTE-M. This will make sure the certified device is always operating under regulation, so it can not be configured on application level.

Best regards,

Charlie

[Azaro]

Hello Charlie,

I don't think I explained myself well. Let's use a practical example.

I'm interested in being able to configure the nRF9161 with a continuous signal at 1GHz at 10dBm. Then, I would measure the impedance matching with the antenna, change the device environment, and measure the matching again. When the antenna is mismatched, the radiated power will be lower. At that point, I would like to gradually increase the power of the nRF9161 at the same frequency until I obtain the radiated power that I measured without mismatching the antenna.

Is it possible to perform this type of configuration with the nRF9161?

Thank you very much for your attention!

[Charlie]

Hi Adrian,

Is TX functionality test (nordicsemi.com) can satisfy your needs?

Best regards,

Charlie