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VISTEK V1638 User Manual

1600 series analogue audio distribution amplifier
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VISTEK V1638 ANALOGUE
AUDIO DISTRIBUTION
AMPLIFIER USER GUIDE
www.pro-bel.com
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Summary of Contents for VISTEK V1638

  • Page 1 VISTEK V1638 ANALOGUE AUDIO DISTRIBUTION AMPLIFIER USER GUIDE www.pro-bel.com...

  • Page 2: Table Of Contents

    VISTEK V1638 analogue audio distribution amplifier Contents DESCRIPTION ......................3 INSTALLATION ......................4 2.1 Rear Panel Connections.................. 4 Table 2.1.1......................5 Figure 2.1.2......................6 Table 2.1.2......................6 2.2 Input Impedance....................7 2.3 Input Mode ......................7 2.4 Lowpass Filter....................8 Figure 2.4.1......................

  • Page 3: Description

    DIL switches (Local mode) or via the DART control interface (Remote mode). The V1638 has an active first order lowpass filter on each input channel. Rolloff point (-3dB) may be set to 60 kHz or 120kHz by jumper option. LEDs for indication of clipping and low input for each channel are provided.

  • Page 4: Installation

    VISTEK V1638 analogue audio distribution amplifier The V1638 is compatible with the Vistek DART remote system, allowing card ID, status, gain and input selection to be read and gain and input selection to be set by a DART compatible rack controller.

  • Page 5: Table 2.1.1

    A in (+) A in ( -) 2,3,4,5,6,8 External audio source All screens from external audio source should 10,11,12, be grounded on the V1638 i/p connector 13,14 B In (+) External audio source Channel B differential input B In (-) Zin = 20kΩ/600Ω;...

  • Page 6: Figure 2.1.2

    VISTEK V1638 analogue audio distribution amplifier Figure 2.1.2 Structure of resistor coupled outputs on expander panel Table 2.1.2 Connector assignments on resistor-coupled expander panel Cable mounted DIN41612 Type C connector assignments Pin No. Row a Row b Row c A11 out +...

  • Page 7: Input Impedance

    Input Mode The V1638 Output groups A[1..5] and B[1..5] may each be sourced from Ain, Bin or (Ain + Bin). DIL Switch SW4 controls the input mode as per the following table. The Ain + Bin mode for a given output group is obtained by switching on both the Ain and Bin switches.

  • Page 8: Lowpass Filter

    The lowpass filter -3dB rolloff point on each input channel may be set to 60kHz or 120kHz. The 120kHz position may be useful in applications where the V1638 is required to pass timecode spooling. The filter is set by jumpers, as per the table below. Note that the filters of the two channels may be set independently.

  • Page 9: Operation

    VISTEK V1638 analogue audio distribution amplifier OPERATION Front Panel LED Indications The green + LED is lit whenever power is applied and the V1630’s internal power supply is operating correctly. The yellow LED flashes briefly to indicate a DARTbus access is in progress.

  • Page 10: Gain Adjustment

    VISTEK V1638 analogue audio distribution amplifier Gain Adjustment The V1638 has two rotary panel switches for adjusting the gain of each channel. These panel switches only have effect when the switch is in the position. The switch adjusts the gain in 8dB...

  • Page 11: Monitoring Jack

    300-600Ω impedance, (eg Sennheiser HD520). Small commercial headphones of 32Ω impedance as used in portable consumer equipment may also be used but they may be damaged at the high of the signal levels possible with the V1638 DA base version. Dart Interface The V1638 has a serial EEPROM for reading and writing card details through the DARTbus in the same manner as other V1600 range cards.

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