Specifications

BATS AND PORTABLE BATS OPERATION
3-73
EXPLANATION OF ERROR CODES
CODE
DESCRIPTION
Raise or lower the Excluded Peak Width Fraction (1.50 = default)
18
MODEL 4460B: Max Interchannel Time Exceeded (To differentiate from EC 01 and EC 16.)
SUGGESTION: High Multipath may cause this error. This is a check for detection on two
channels, verifying that the time between the two are less than the parameter setting of
2.5ms.
WARNINGS ONLY ( > 20)
21
Unusable Telemetry Signal received. (Uses previous depth)
MODEL 4460B: Telemetry SNR Below Threshold Setting
SUGGESTION: Lower the Signal To Noise Threshold in Trackman (Beacon Setup dialog/ Fil-
tering Tab) for that target. If still not detecting then noise could be too high or range is ex-
cessive for that beacon or the beacon’s battery (if applicable) is getting low. If Navigation
SNR is OK then make sure the Telemetry frequency/code is correct.
or…
MODEL 4460B: Quality Factor < min QF Threshold
SUGGESTION: Usually means a high multipath environment. Check the Min Quality Factor
setting in the Expert menu to see if it is up too high (2 = default). Check that the Hydrophone
is installed correctly and that there is enough clearance between Hydrophone tip and water
surface and the sea floor. Check that the receive code is correct for the beacon. It is possible
that the signal has two correlation peaks and the wrong peak is being selected. Open up the
reverse time direct path search parameter to 5ms in the expert menu (2.5ms = default).
Raise or lower the Direct path Min Amplitude Fraction in the expert menu (0.4 = default).
Raise or lower the Excluded Peak Width Fraction (1.50 = default). If Navigation QF is OK OK
then make sure the Telemetry frequency/code is correct.
22
Reserved.
23
Telemetry timing out of range. Telemetry time is either less than the entered ‘0’ Delay or
greater than the full scale span.
SUGGESTION: Check the “Zero Delay” parameter under the Beacon Setup dialog/ Depth
Tab. Make sure Zero Delay setting agrees with Beacon label. Perform a Zero Offset adjust-
ment by setting beacon to a known minimum depth and adjust the Zero Delay to agree with
the actual depth. This will take out any temperature offsets in the gauge.
SUGGESTION: Check the “Full Scale Delay” parameter under the Beacon Setup dialog/ Fil-
tering Tab. Make sure Full Scale Delay setting agrees with Beacon label. Check that the bea-
con’s depth did not exceed the gauge depth rating.
24
Reserved.
26
No recent telemetry replies. No telemetry signal has been received for at least 16 seconds.
SUGGESTION: If the Navigation reply is being received then check Trackman setting (Bea-