gNB with external power amplifier

ss-PBCH-BlockPower is automatically computed if the RF interface provides its transmit power, which is the case for Amarisoft SDR.

When an external amplifier is used, some changes are required:

If you use a version 2023-09-08 or later, set the tx_power_offset parameter in the rf_port configuration object to the external power amplifier gain.
If you use a version older than 2023-09-08, ss-PBCH-BlockPower must be manually set. To do that, add the following under "nr_cell_default" or for any NR cells under "nr_cell_list"
manual_ref_signal_power: true, ss_pbch_block_power: xx, /* tx_power */
where tx_power = ss-PBCH-BlockPower automatically set (when manual_ref_signal_power = false) + external power amplifier gain.

Enable "bcch" logging to check the ss-PBCH-BlockPower value broadcasted in SIB1.

To do that, just add bcch=1 to log_options, example:

log_options: "all.level=error,all.max_size=0,nas.level=debug,nas.max_size=1,ngap.level=debug,ngap.max_size=1,xnap.level=debug,xnap.max_size=1,rrc.level=debug,rrc.max_size=1,bcch=1",