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RDX-2 Diplexer for use with SP-801A Square Wave Pulser

The RDX-2 is a broadband (0.25 to 45 MHz) passive device for allowing a single transducer to be used both for transmitting and receiving sound (pulse-echo). It protects the receiver input (BR-640) from the high power output of the SP-801 square wave pulser without loading the pulse and also provides an efficient transfer of signal from the transducer to the receiver.

Additional features have been incorporated to allow the user to optimize signals for a unique setup:

  • A switchable 10-Ohm load on the transmitter. This is particularly valuable to preserve the SP-801's fast rise and fall times when driving a high- frequency, large-capacity transducer.
  • Eight selectable high pass filters to the transducer. These improve recovery time for higher-frequency signals.
  • Adjustable damping on the receiver input. This may be effective in minimizing ringing in the transducer.