Specifications

BATS AND PORTABLE BATS OPERATION
3-71
EXPLANATION OF ERROR CODES
CODE
DESCRIPTION
0
No error. The error code zero (0) does not appear on the screen or sent out the RS-232 inter-
face, but is a null character, indicating no error.
1
Unusable signal received. Signal received, but TrackPoint unable to calculate a position. This
could have been due to acoustic noise contaminating the incoming signal or to other causes.
The red LED and the audio may show valid detection of a signal. No position is plotted.
4460B: Navigation SNR below threshold setting
SUGGESTION: Lower the Signal To Noise threshold in Trackman for that target. (Perform a
noise level test by turning off the beacon and lowering the threshold until the system false
detects. Raise Threshold 5dB above the false detect level.) Put Beacon back in and try again.
If still not detecting then noise could be too high or range is excessive for that beacon or the
beacon’s battery (if applicable) is getting low.
2
Range-gate (or Pinger time-gate) error. (All filter levels) This does not necessarily indicate a
problem, since the signals may be echoes, which should be rejected. Alternatively, the range
gate may have lost its lock on the signal and several more pings may be required for the
range gate to re-acquire the target. No position is plotted.
3
Range cannot be determined. This occurs in transpond or respond mode if the calculated
range is zero. This can happen if a pinger is designated as a responder or transponder and
the transmitter is not turned on. No position is plotted.
4
Low Quality Factor. The signal of the present reply had a quality factor that was lower than
the average of the previous five replies. No position is plotted.
5
Target velocity excessive. Target velocity, based on the change in horizontal position since the
last up-date exceeds 10 knots. This filter takes advantage of the fact that tracked targets
cannot move very fast. This error can occur at filter levels 5 to 10. No position is plotted.
NOTE:
A rapidly turning ship can make the target appear to move fast and can cause this error. To
alleviate this, integrate a compass into TrackPoint.
6
No recent replies. This message appears if, in any mode, no detected signal has occurred for
16 seconds.
SUGGESTION: Check to see if the beacon is in the water. Check Trackman setting VS Bea-
con label to make sure it is being interrogated with the correct frequency. Check to make sure
the Beacon receive code is correct.
# TOD HDG BRG S.R. X Y Z TEL ERR
1 02:12:04 -.- -.- -.- -.- -.- -.- 6
1 02:12:06 -.- -.- -.- -.- -.- -.- 6