Bird Technologies SH-36S-RM-Manual - Manual (Page 63)

Settings
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Figure 32 Example, Mask List
Once a mask is selected, it is controlled by the following options:
Freq Lock -
Locks the mask onto the selected band even if the
frequency is changed.
EM to Max Peak -
Sets mask’s reference level to the maximum peak in
each sweep.
Figure 33 Example, Limit Line Mask