Advanced Radar Options; Target Expansion - Lowrance HDS Gen3 Operator's Manual

Advanced radar options

Noise Rejection
(Broadband 4G radar only)
The Noise Rejection control sets the amount of noise filtering
applied by the radar. Target sensitivity is increased at longer ranges
when this control is set to Low or High, but does cause some loss of
target discrimination.
Tip:
To get maximum range performance from Broadband 4G
Radar, transmit on one range only, set the Noise Reject control to
High and the threshold as low as possible. The default is 30% for less
clutter on the screen. If OFF is selected for the HDS Gen3, the range
performance is about equal to 3G radar. In some areas where
extreme high interference may exist, try OFF for best radar image.
Radar threshold
The threshold sets required signal strength for the lowest radar
signals. Radar returns below this limit are filtered and are not
displayed.
Default value: 30%.

Target expansion

Target expansion increases the length of targets in range, making
them easier to see.
Rejecting radar interference
Interference could be caused by radar signals from other radar units
operating in the same frequency band.
A high setting reduces the interference from other radars.
In order not to miss weak targets, the interference rejection should
be set to low when no interference exists.
Target separation
(Broadband 4G Radar only)
The Target separation control allows you to control the target
discrimination of the radar (separation between objects is more
prominent).
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Radar | HDS Gen3 Operator Manual