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ZTM100

Archives - Emergency message assembly

 

ZTM100 is an emergency intervention assembly, specially designed for unskilled people. During the studio closed hours, a speaker or reporter will be able to easily live broadcast warning or safety messages, for instance to advise people of meteor, or chemical pollution.
The idea is to use an already knownequipment, in this case a reporter KB cell, from which the microphone signal is drawn at the processor output. Of course, it is possible to provide a dedicated cabin with its own microphone and sound processor.

The equipment consists of two parts:

- A one unit rack ZTM100 to be inserted at the end of the signal path in CDM, just before the transmitter output or STL (connection uses balanced XLR connectors).Outside interventions, the broadcast signal travels trough relay contacts. It also features a lock loop, avoiding unattended switch when the studio is in use (in that case, the warning is sent from the studio) a headphone amplifier for announcer return, one monitor input to feed the headphone amplifier (tuner monitoring for instance), an audio output for off air test. Auxiliary GPI and GPO allow to switch a digital audio path in using AUF500. During warning transmission, the microphone signal from KB is sent to transmitter or STL (line level)

- A set of three boxes in KB:

  • ZTM100C : keyboard with deformable membrane, fire type (the shape recovery requires a specific key). The ON AIR switch starts when the keyboard is pressed.
  • ZTM100i , wiring and despatch between ZTM100, ZTM100C and ZTM100P.
  • ZTM100P desk including the headphone connector, and associated 6 ways attenuator (the first one does not switch off completely the headphone) and a fugitive key with light indicator. After the use of ZTM100C this switch allows to broadcast. A procedure allows to carry the same functions except broadcasting for tests purpose.

Note:

  • Out of use the program signal is bypassed by the relays between input and output.
  • In case of power fail,the relays protect the broadcasting.
  • After action on the deformable keyboard ZTM100C, the audio signal travels trough electronic circuits in using VCA.
  • When microphone key is pressed on  ZTM100P, the broadcast program is faded by VCA, at the same time the microphone VCA takes the hand.
  • The rise and fall time are adjustable for signal and microphone. The faded signal level is also adjustable. The use of VCA increases the listening comfort during multi interventions. The keyboard form reset, switches back ZTM100 to bypass.

 

APPLICATION:

Emergency message broadcasting by unskilled people, during closed hours of broadcasting studios.


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