default or selected kernelversion does not have config value CONFIG_IWL3945_SPECTRUM_MEASUREMENT.
Result is shown for kernelversion 5.4.194
Enable Spectrum Measurement in iwl3945 driver
configname: CONFIG_IWL3945_SPECTRUM_MEASUREMENT
Linux Kernel Configuration
└─>Device Drivers
└─>Network device support
└─>Wireless LAN
└─>Enable Spectrum Measurement in iwl3945 driver
In linux kernel since version 2.6.25 (release Date: 2008-04-16)
This option will enable spectrum measurement for the iwl3945 driver.