OPERATION
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Note: While using the Mask function, you may notice some signals seem to automatically be
removed from the list. Some types of signals, such as frequency hoppers or FM transmitters
may initially appear as several distinct, closely spaced signals. Overtime, as the envelope of this
signal begins to fill in with peaks, the Mask function will automatically group these previously
recognized narrow band signals into one signal with a larger bandwidth.
Mask Example: Detecting the presence of a cell phone call
• Edit – Once a math trace has been set up, use the Edit icon to change what traces are used in
the Math Trace.
• dB / div – The dB/div drop down box allows you to change the scale of the math trace graph. By
default this is set to 5 dB per division.
• Reference – use the Reference Icon to change the reference level of the bottom of the math
trace graph. The reference level can be adjusted from -40 dB to 100 dB. To enter negative
reference values, select +/- on the virtual keypad or press the +/- key after entering the numeric
value.
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