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 Analogue A/V PRODUCTS Analogue Video

 

VA-700    8 O/P Analogue Video DA
AVA-3900    Triple 3 O/P Analogue Video DA
VG-737   Video Sync Loss Detector

DVC-4112    SDI to Composite/Component Converter DA
DVC-4360    Composite/Component PAL/NTSC to SDI Converter
DVG-4090    SDI/Composite Test Pattern Generator with 

VA-700 Eurocard Video Distribution Amplifier

Features
  • IRT Eurocard construction
  • Loop through input
  • Ten BNC outputs on rear
  • >30 MHz bandwidth
  • Front panel monitoring output
  • Cable equalisation to 300 metres
  • Various clamping options
  • Longitudinal hum stripping
  • Front panel EQ & gain adjustment

General

The VA-700 is a video distribution amplifier of modular Eurocard construction having facilities for cable equalisation, longitudinal hum reduction, and clamping.
The input is a bridging loop through type to facilitate connection to other equipment. Ten 75 Ω outputs are provided on the rear with an additional output on the front panel for ease of monitoring.
The input and output grounds are separated to provide rejection of longitudinally developed hum. The input is AC coupled and the output DC restored with options for no clamping or clamping to the internal or an external signal. The external clamping facility may be used to provide correct DC restoration in YUV & RGB signal situations.
The video gain may be varied by ± 3 dB from the front panel. Internal preset controls allow adjustment of the amplifier frequency response, optimisation of the longitudinal hum rejection, and stage output DC voltages.

Cable equalisation is provided for up to 300 metres of 75 Ω high quality cable with adjustment via the front panel. In addition the VA-700 may be fitted with an optional additional equalisation sub-board and a switch to select equalisation type.
The VA-700 may also be fitted with an optional subboard for mounting of delay lines or filters. The DL-700 sub board also provides delay adjustment trim and additional compensating gain for losses in long delay lines (only available whilst current stocks last).
The VA-700 may also be used as a pulse distribution amplifier. (Only 6 outputs may be used for 4 Vp-p)
The VA-700 is manufactured on an extended Eurocard board for mounting in IRT Eurocard frames.

AVA-3900 Triple Video Distribution Amplifier

Features:
  • Gain reserve
  • DC coupled
  • Longitudinal hum reduction
  • Cable equalisation
  • Three outputs
  • Terminating inputs
  • Suitable for standard and wideband analogue video signals
     
 
Applications:
  • Line equalising amplifiers
  • Component distribution amplifier
  • Isolation of multiple monitoring points

General

The AVA-3900 is a high performance Eurocard video amplifier package containing three separate amplifiers.

Gain and cable equalisation controls are accessible on the front panel and the longitudinal hum reduction adjustment is an internal pre-set potentiometer.

The cable equaliser characteristics are pre-set to compensate for a maximum of greater than 250 metres of 75Ω video cable. This can be changed to accommodate different cable types.

The AVA-3900 is a standard IRT Eurocard and is compatible with our other Eurocard products.

Two AVA-3900 Eurocards may be mounted in the IRT 1 RU chassis providing 6 VDA's in 1 RU.

Uses for the AVA-3900 include:

Adjustment of gain and frequency response of multiple video signals at a central location.
Isolation of multiple monitoring points.
RGB / YUV signal distribution or monitoring

VG-737 Video Sync Loss Detector

Features
  • Differential loop through input does not effect other equipment.
  • Good noise immunity.
  • Selectable alarm on and off timing.
  • Automatic, manual or remote reset.
  • 2 x Relay contact alarm outputs.
  • Convenient Eurocard design

General

The VG-737 video detector is used to indicate the presence of a video signal by detecting the vertical sync component of a composite video signal. The detection circuitry used ensures that noise alone will not trigger the detector.
The video input is a high impedance bridging differential input circuit with the input common raised above ground, this allows the VG-737 input to bridge a signal cable without affecting common mode rejection circuitry that may be incorporated in the equipment terminating the cable.
The video signal level threshold at which the VG-737 switches is set by an internal control and may be adjusted for a signal level in the range 0.4 V to 0.7 Vp-p at the input.
The detector circuitry consists of a sync separator and vertical integrator, which triggers a dual mono stable circuit that allows the response time of the alarm circuit to be set. 

The response time is set by means of DIP switches in the RC timing circuit and is adjustable from 1 to 32 seconds for the VIDEO FAIL time out and 1 to 8 seconds for the VIDEO ON response time, the adjustment being made in 1 second steps.
The alarm circuitry consists of a latching circuit triggered by the detector circuit, which drives a relay whose contacts are available at the rear panel of the VG-737.
The alarm circuit can be reset automatically upon return of the video signal or by a contact closure from the front panel or a remote circuit.
Visual indication of the state of the VG-737 detector and alarm circuits is provided by LED indicators on the front panel.

 

DVC-4112 270 Mb/s SDI to Composite Converter & DA

Features

 

  • Broadcast quality, full 10-bit video conversion.
  • 4 Equalised, regenerated and re-clocked repeater outputs.
  • 3 Composite analogue outputs with high quality 10 bit D/A.
  • Component (RGB, YPbPr) or S-Video (Y/C) output.
  • PAL or NTSC operation with auto or manual switching.
  • SDI input loss and decoded video indicators on front panel.
  • Simple Network Management Protocol (SNMP) capability..

General

The DVC-4112 is a high performance SDI 270 Mbit/s serial digital video to analogue composite/component converter and distribution amplifier.
The DVC-4112 is designed to regenerate a link and provide a broadcast quality analogue composite or component signal.
The serial receiver section, shown in the block diagram above, automatically equalises and re-clocks the input serial video signal and the cable driver section retransmits the regenerated serial video.
This configuration allows both an extension of the link and a jitter performance advantage over non re-clocking regenerators.
The DVC-4112 is primarily intended to operate in mixed (digital and analogue) environments allowing existing analogue monitoring equipment to be utilised without the need to purchase more expensive digital equipment.

DVC-4360 Composite to 270 Mb/s SDI

Features:
  • Broadcast quality, full 12-bit video conversion.
  • 2 SDI 270 Mbit/s outputs.
  • 2 AES or 4 Analogue Audio Inputs.
  • PAL or NTSC operation with auto switching.
  • Video input indicator on front panel.
  • Standard IRT Eurocard format may be mixed with other IRT analogue and digital Eurocards in the same frame.

General

The DVC-4360 is a high performance PAL / NTSC composite to 270 Mbit/s serial digital (SDI) video converter, complete with analogue or AES audio insertion.
The DVC-4360 provides two SDI outputs.
Audio channel allocation and source selection is provided by links on the main board.
The DVC-4360 is designed to provide a broadcast quality composite to SDI conversion using the latest digital filtering techniques.
The composite input section, shown in the block diagram above, automatically detects the composite input standard (PAL or NTSC) and generates the appropriate 625 or 525 SDI format.

Link settings are provided for default output on signal loss. This is either blue or black in 625 or 525.
Full 12 bit video processing and 20-bit analogue to digital audio converters are used in order to assure a high quality SDI signals suitable for broadcast and production monitoring applications.
The DVC-4360 is designed to fit IRT's standard Eurocard frames as well as IRT's 4000 series frame for use with IRT's SNMP system and may be used alongside any other of IRT's analogue or digital Eurocards.

DVG-4090 SDI / Composite Test Pattern Generator with Crash Switching

Applications:

  • SDI or Composite PAL/NTSC operation.
  • Choice of 16 Test Patterns on loss of video input.
  • Choice of 8 banners overlaid or keyed onto SDI input or Test Pattern output.
  • Simple Network Management Protocol (SNMP) capability. (Future)
 
General

The DVG-4090 acts as a video crash switcher and test pattern generator. On loss of video input, output is automatically switched to a choice of 16 test patterns.

8 custom built banners containing text or pictures, such as station logos, and 2 full screen pictures can be downloaded by supplied software. Single banners can be overlaid or keyed onto the test pattern output in the lower section of the video picture. In the case of an SDI input, these banners can also be overlaid onto the existing stream.

A countdown banner and audio test signal insertion is also available for link identification purposes.
Two rear assemblies are supplied for analogue and digital video input operation, however both rear assemblies contain both composite and SDI outputs.
The DVG-4090 is designed to fit IRT's standard Eurocard frames as well as IRT's 4000 series frame for use with IRT's SNMP system and may be used alongside any other of IRT's analogue or digital

 

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