Telephone Hybrids - DHY-03 - Series (Digital)

    • Fully automatic - adapts to varying line conditions and has automatic signal limiting.
    • Fully adaptive echo cancellation to 127msec - default is 24msec.
    • 76dB typical line balance rejection offering superb performance and crystal clear audio.
    • Front panel input and output gain controls.
    • Front panel LED metering of receive and send signals.
    • Built-in conferencing for 2 hybrids, so that a single telco channel on a mixing desk can receive 2 calls.
    • Integrated ring detector - automatic call answering after a pre-determined number of rings.


    The DHY-03S is a single automatic digital TBU, 19" (48.3cm) 
    rack-mount unit.

    Technical Specification For DHY-03

    Audio Specification

    Input Impedance - Line Mode (Clean Feed): 10kΩ balanced 0dB
    Input Impedance - Conferencing: 10kΩ balanced 0dB (not for DHY-03EC)
    Input Impedance - Microphone Mode: 2kΩ balanced (not for DHY-03EC)
    Input Level Gain Range: +6dB, 0dB, and -6dB adjusted by 3-position front panel switch, 
    +10dB jumper
    Microphone Level Gain Preset: From 65dB to 35dB (not for DHY-03EC)
    Maximum Input Levels: Line +26dBu, mic -24dBu
    Clean Feed Limiting Input: -4dBu for CTR21 setting, other values available *
    Bandwidth to Telephone Line: 250Hz - 4kHz, -3dB ref 1kHz
    Telephone Line Impedance: 600Ω, 900Ω plus 14 other complex impedance circuits *
    Output Impedance - Line Out: 50Ω balanced floating 0dBu
    Output Impedance - Conference/Record: 50Ω balanced floating 0dBu
    Output Level Gain Range: +6db, 0dB, and -6dB adjusted by 3-position front panel switch
    Rejection Ratio: 76dB on tones or complex waveforms, reference peak level of 0dB
    Ring Detector Sensitivity: Off, 2, 4 or 6 rings
    Power to DHY-03, S & T Universal 12Ω power supply: 90 to 250V AC; 47-63Hz; fused 1A
    Power to DHY-03EC ±15 V DC @ 160mA per rail or regulated +5V DC @ 600mA
    * These values are dependent on the actual country setting selected on the DHY-03


    Mic/Line Input: XLR 3 pin female, with push-button mic/line selection
    Line Output: XLR 3 pin male
    Telephone Line: RJ11 6/4 socket
    Telephone Handset/Instrument: RJ11 6/4 socket
    Conferencing or Record Audio: RJ45 socket
    Remotes: 9-way D-type socket
    RS232 Serial: 9-way D-type socket
    Power: IEC mains (CEE22)
    Connections for Eurocard 64 pin DIN 41612 male (plug)
    Each DHY-03, S & T unit is supplied with 1 x RJ11 to RJ11 telephone line lead, 1 x RJ11 to BT plug telephone line lead, 1 x BT handset socket to RJ11 plug adapter, IEC mains lead fitted with moulded mains plug, handbook and warranty card.

    Physical Specification

    Order Code     Description
    Total Nett
    Total Gross Weight
    DHY-03S     Automatic digital TBU, 19” (48cm) rack mounted
    4.5cm (1U)
    1.8” (1U)
    (19” rack width)
          DHY-03S boxed
    *Depth is measured from the front to the end of the connectors fitted to the back of the unit.

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