GAPS - User Guide
When the two interrogation frequencies are different, the blanking time is higher than the
acoustic recurrence. In a single transponder mode, you cannot have a blanking time higher
than the acoustic recurrence. So when you use two transponders with two different
frequencies, make sure to have the correct settings in the transponder hardware.
Codes
There are, see table above, several families of interrogation/reply codes:
● Codes 22 / 23
● Codes 0 to 45
● Codes Sonardyne Wideband®1
It is recommended to use codes from only one family in the frequency plan. iXblue guarantees
the intercorrelation properties only within the same family of codes.
Sonardyne Wideband® 1 transponders must be in ENABLE state in order to be interrogated
by GAPS.
Figure 37 - Transponder Window
From this window, you can carry out the following tasks:
● Add a transponder to the list
● Configure a transponder (interrogation, reply, dynamic positioning mode, filtering)
● Activate a transponder
● Remove a transponder from the list
MU-GAPS-AN-005-H - November 2019 85
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