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Midian Electronics MTSD-3 Manual

Two-tone decoder
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MTSD-3
Two-Tone Decoder
Manual Revision: 2010-08-27
Hardware Revision(s): 165C
1

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Summary of Contents for Midian Electronics MTSD-3

  • Page 1 MTSD-3 Two-Tone Decoder Manual Revision: 2010-08-27 Hardware Revision(s): 165C...

  • Page 2: Specifications

    CIRCUIT DESCRIPTION The signal is fed into the MTSD-3 via the orange lead and is amplified by U1A. The value of “R Limit” may be adjusted by the customer to adapt the audio signal available into the customer’s radio. This range, from 10 mV to 1 V RMS, is shown on the input level chart on the schematic.

  • Page 3: Hardware Installation

    PRODUCT PROGRAMMING A Tone: Encode the desired A tone to the MTSD-3 at 0.5 to 1.0 V p-p while monitoring TP2 with an oscilloscope. Turn the pot R-12 until maximum amplitude is obtained. If the pot is turned past the peak then the tone will drop out.

  • Page 4: Hardware Alignment

    Tone Decode Time: The acquisition timing of the MTSD-3 is for 750 msec to 1 second A tone. To lengthen the time, increase the value of R-25 or decrease the value of R-25 to decrease the time. R-29 controls the acquisition timing for the B tone and is affected in the same way as R-25.

  • Page 5: Technical Notes

    TECHNICAL NOTES 2 + 2 Decode: Two MTSD-3 modules can be “anded” together to do 2 + 2 decoding, such as Motorola Quick Call 1 or AvCall. Follow the steps below to set up 2 MTSD-3 modules for 2 + 2 decoding: 1.
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