#check power level of car keyfob
rtl_power -f 314M:316M:1M -g 300 -i 1

#-f lower:upper:bin_size [Hz]
#bin size is a maximum, smaller more convenient bins will be used.
#valid range 1Hz - 2.8MHz

#-i integration_interval (default: 10 seconds)

#-g is gain.  Keyfob is not strong so turn gain way up for this example 300

#save to csv
rtl_power -f 314M:316M:1M -g 300 -i 1 radio.csv

#create chart from csv online
https://www.datawrapper.de/ #MIT
http://app.rawgraphs.io/ #LGPL