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Midian Electronics MTSD-3, Manual

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Midian Electronics MTSD-3 Manual Download Page 1

 

 
 
 

MTSD-3 

 
 

Two-Tone Decoder 

 
 
 

Manual Revision:  2010-08-27 

 
 

Hardware Revision(s):

 165C 

 

 

1

Summary of Contents for MTSD-3

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

Page 2: ...e timing circuitry of U3A through U3E U3F is the 2400 Hz alert tone oscillator and is held off by a low from U3E until decoding Upon decoding the output of U3E is also sent to U2C and the resulting hi...

Page 3: ...Orange White Monitor 2 Input Connect to a point in the transmitter that goes high when PTT is tapped or depressed This will unlatch U2 C and the squelch outputs for channel monitoring When finished w...

Page 4: ...se 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 OPERATION Decode Upon decoding of the proper 2 tone sequence the f...

Page 5: ...re from the second MTSD 3 to the emitter leg of Q3 on the first MTSD 3 3 Connect the Horn Output wire P1 10 Gray White wire on the first MTSD 3 to the desired relay or equipment 4 When both units deco...

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