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The vertical axis of the graph represents the strength of the signal or noise heard by the radio while running as a spectrum analyzer. It is measured in dBm. (decibels relative to a millwatt) A level of -120 can only be attained by attaching a dummy load to the radio. -105 or -110 may be heard in a very quiet location. A -40dBm signal is very strong, eg from a radio very near. Any signals not heard from your own radio system should, on average, be lower in strength than signals from your own system.
The vertical bars seen on any channel (eg "|" represent the signal level heard on the last sweep. Go to the top of the bar, then across to the signal level on the left to see how strong the signal was.
Upwards-pointing arrows, called carets (shift 6 on the keyboard), may appear above the vertical bars on some channels. These represent the strongest signal heard on a specific channel since a continuous sweep began.
If after extensive testing, it is found necessary to lock out channels due to persistent interference on specific channels, please use the following procedure: