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Datasheet
High Power Transponder/Responder (Discontinued)
Description
This Type 7823 High Power
Transponder/Responder has been
developed for operation with the
Sonardyne Ultra-Short BaseLine
System (USBL) Type 7707 in deep
water on a Towfish or ROV. It can
also be interrogated by other systems
such as Sonardyne PAN Type 7145.
Its high power output and pressure
rating make it ideal for operation at
long range in deep water. Its ability
to operate as a Responder makes it
suitable for use on noisy ROVs and
its reversion to Transponder mode
when the trigger is disconnected or
held low means that it will allow the
position of the ROV to be determined
if connections to it are lost.
It operates as a Responder if the
trigger input is pulsed, transmitting
61.3ms after the positive edge of the
trigger pulse. Otherwise if the
trigger input is unused or held low it
operates as a Transponder with a
turn around delay time of 62.5ms.
The Transponder/Responder has
been designed as part of
Sonardyne’s integrated family of
underwater acoustic navigation
equipment and operates in the
frequency band of 20-30kHz.
The excellent transducer response
time and stable turnaround delays
allows good measurement accuracies
to be achieved and the delayed
response provides a ‘down to zero’
ranging capability.
It is designed for the MF band and
optimised to give maximum source
level transmitting around 27kHz.
Other channels can be selected using
an internal switch.
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