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4-36
7. Touch Advanced.
The Advanced Transpond
Parameters pop-up opens as
shown in Figure 4-51.
8. Tap, or touch and hold, the up or
down arrow to adjust the receive
threshold.
The receive threshold sets the
number of standard deviations that
a detected signal must rise above
the background noise level before
it is marked as a ping.
The lower this setting the more sensitive is the receiver and the more
likely a detected signal will be marked as a received ping. However, with
a low setting there is also a greater likelihood of "false positives," where
a detected signal is incorrectly marked as a ping.
The higher the setting the less sensitive is the receiver and the less likely
a detected signal will be marked as a received ping. Therefore a high
setting increases the likelihood of "false negatives," where a detected
signal is not marked as a ping and should have been.
The receive threshold should be adjusted in accordance with the
background noise such as to minimize false positives and negatives.
9. Tap, or touch and hold, the up or down arrow to adjust the ping lockout
time in milliseconds.
The ping lockout time is the elapsed time between the start of the
transmitted ping from the deck box to when the deck box will enable the
detection of received signals. Effectively, this setting inhibits the
detection of echoes from the transmitted ping off nearby objects.
10. Touch the check mark to close the Advance Transpond Parameters
pop-up and save the receive threshold and ping lockout settings.
User's Manual
TELEDYNE BENTHOS
Figure 4-51 Advanced
Transponder Parameters Pop-Up
P/N M-270-10, Rev. B
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