Specifications

BATS AND PORTABLE BATS OPERATION

3-63

 Range and bearing information being updated for that target in the status block.

 The Target #1 green Interrogate LED flashing for each interrogate signal transmitted, and the

red Receive LED flashing for each signal received

 With a transponder at close range the Quality Factors should typically be 9’s or 10’s.

Hardwired Transponder Mode

The Hardwired Transponder mode feature is used where a burst or tone from the transmitter trig-

gers a transponder via an umbilical. A high level transmit burst from a transmitter can be attenuat-

ed and impressed on an umbilical to trigger a hardwired transponder. This is useful in situations

where there are not enough conductors available to trigger with the normal responder key out

pulse or there is excess noise causing false triggers. When a target is set up as a Hardwired Tran-

sponder, the transmitter is enabled and the slant range is compensated for the one-way acoustic

travel time. Set the Target Interrogation Frequency to the correct value for the hardwired tran-

sponder’s receiver. See Note

3.4.2 RESPONDER MODE

To establish tracking in the responder mode, the proper cable connection must be made at the

Transceiver. Connect the Trigger out signal from the SYNC connector of the Transceiver to the Re-

sponder or Responder umbilical cable. To output a differential signal to the Responder connect the

TRIG-OUT1 (pin-M) and /TRIG-OUT1 (pin-L) lines to the Responder. To send a positive going pulse

connect the TRIG-OUT1 (pin-M) and COM (pin-N) signals to the Responder and to send a negative

going pulse connect the /TRIG-OUT1 and COM signals to the Responder. The TRIG-OUT signal lev-

els can either be +5 TTL or +12VDC, as selectable on the internal Peripheral Interface Card (PIC)

within the Transceiver. Default setting is +5V or TTL compatible.

The TRIG-OUT pulse NOT ISOLATED and it occurs on both the transponder (transmit) and respond-

er trigger cycles.

The responder itself must be operational and in the water. Refer to the instruction manual for the

particular responder in use. Follow the steps outlined in the TRANSPONDER section, 3.3.2, to

choose a target, set the frequency, turn tracking on for that target and enter depth. The target

TYPE must be designated as a responder and the Pulse Turn Around Time must be entered.

It is not necessary to set a transmitter frequency for a Pulse Mode responder. The Interrogation

Interval must be set for the maximum range encountered to the responder. E.g., @ 1500 me-

The receive LED flashes at the beginning of the next interrogation cycle. All processing is per-

formed at the end of the interrogation as detection is not known until after the next interrogation.

The transponder lock-out time can be reduced in these circumstances to allow for a faster inter-

rogation rate than the normal 2 seconds.