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  • A W Comms DRC-1S

    Product Code - DMKBU39K0J


    • A W Comms DRC-1s
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    Product Description

    A W COMMS DRC-1S

    Download PDF: A W Comms DRC-1s

    • Motorola Signalling
    • Simoco Signalling
    • Modem Access
    • Speech/data priority setting
    • M80 Emulation
    • Internal/external microphone
    • Internal/external loudspeaker
    • Easy to configure
    • Rugged metal case
    • Separate brick PSU
    • Low cost

    The DRC-1s has been specifically designed with ease of configuration and, ease of use in mind.  The unit employs our own DSP software code providing signal generation and detection, and is housed in a rugged 1mm steel case which is powder coat finished.

    The unit offers full control for land-line based remote radio sets via 600 ohm balanced lines.  The configurable features include the generation of either Motorola tone remote signalling or Simoco (2970Hz) key tone, M80 emulation, both local and remote, plus many other configurable features.

    The unit is eminently suitable for providing dual manual and computer access to, and control of the radio base station over land-line, with configurable signalling format and configurable priority given to either speech dominant or data dominant systems.

    The interface connectors are found in a single row to the bottom rear of the case, thus permitting neat wiring to the unit.  The front panel has tactile pushbuttons for PTT and TT on/off, plus LED's for DC power, channel busy,TX and TT state.

    The signalling options are selected on a switch field found on the main PCB card, details of which are given below.

    The external connectors:

    • Line Socket - RJ45 - for the connection of four-wire land line
    • Microphone Socket - RJ6 - to connect an external microphone if required.
    • Auxiliary Socket - DB9F - for external modem connection
    • External PTT - 2Pin - for connection of a foot switch PTT
    • External Speaker - 3.5mm - socket for connecting an external speaker if required
    • Power Connector - for 12v DC power input

     

     Line Interface Connector RJ45
     Pin No      Signal     Notes 
     1   Line Input 0                      600Ω balanced             
     2  Line Input 1  600Ω balanced
     3  Line Output 0  600Ω balanced
     4    
     5    
     6  Line Output 1  600Ω balanced
     7  PTT Output  Active low
     8  Ground  

     

    Desk Microphone Connector RJ11
    Pin No      Signal          Notes  
     1  Earpiece Output  150Ω
     2  Ground  
     3  Microphone Input  Electret Biased 10kΩ   
     4  PTT  Active Low    
     5  External Microphone Select         Active Low
     6  Auxiliary +12v DC  Limited to 500mA

     

    Auxiliary Connector DB9F
    Pin No       Signal  Notes 
     1  Auxiliary +12v DC  Limited to 500mA         
     2  Audio Output 0  600Ω balanced
     3  Audio Input 0  600Ω balanced
     4  Auxiliary PTT  Active Low
     5  Operators Busy Signal                 Active Low
     6  Loudspeaker Mute  Active Low
     7  Audio Output 1  600Ω balanced
     8  Audio Input 1  600Ω balanced
     9  Ground

     

    Special note:  The auxiliary power supply is fed by an auto-reset fuse.  The output from the supply when all of the auxiliary outputs are summed should not exceed 500mA.

    The signalling interface which the DRC-1s presents to the outside world is programmable, and set by the internal switch bank (dip switches). The switch bank is constantly read and changes made should be implemented within 200mS.

    SW1
    S3  S2      S1   
    Off          Off            Off       DRC-1 hardwire PTT            
    Off  Off  On  DRC-1 2970Hz PTT
    Off  On  Off  M80 Remote emulation
    Off  On  On  M80 Local emulation
    On  Off  Off  Motorola 2100Hz PTT
    On  Off  On  Motorola 2175Hz PTT
    On  On Off   Motorola 2325Hz PTT
    On  On On   Motorola 2325Hz PTT

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