Video/sync master clock generator for post-production
The Tascam CG-1800 Master Clock Generator generates NTSC, PAL and HD Tri-level video clock - as well as word clock through BNC, AES/EBU and S/PDIF outputs to ensure compatibility with any synchronization system. The CG-1800 is designed for the needs of small to large-scale video/audio synchronization systems.
Numerous output connectors, including 12 word clock outputs
In addition to (12) word clock outputs and (4) video outputs, the digital outputs include (2) AES3/AES11 and (2) S/PDIF outputs, making this unit useful for large-scale audio/video synchronization systems, and a wide variety of other applications. Of the (12) word outputs, two also support x2Fs, x4Fs and 256Fs output - enabling them to be used in systems with ProTools and other DAW software.
Internal clock uses a high-precision OCXO that is not influenced by the temperature of the environment
The Tascam CG-1800 has a crystal oscillator which is the heart of the clock generator, In the CG-1800, an OCXO (oven-controlled crystal oscillator) is used for its high precision, and the fact it is not influenced by the temperature of the environment. Boasting a clock frequency precision of 0.01 ppm*, which exceeds that of a TCXO (temperature-compensated crystal oscillator), this unit is key in the creation of high-precision synchronization systems - with word output frequency stability of +/-0.005ppm or less per day.
Input connector that supports 10MHz signal - allowing the creation of systems with even higher precision
An external input connector that supports a 10MHz signal enables the CG-1800 to be connected to a rubidium clock or GPS clock for even higher precision.
Jitter management circuit provides stable clock
The CG-1800 has an external clock jitter is reduced using an original TASCAM circuit design that incorporates featuring an FPGA (Field Programmable Gate Array) and a PLL (phase-locked loop) circuit with a discrete filter.
This enables a stable clock signal to be provided to the word outputs, improving system stability.
Glitch-free relocking circuit prevents noise and skipping during clock dropouts and recovery
The CG-1800 constantly measures the external reference clock. In devices that do not have built-in countermeasures, and the master clock signal drops out, the video reference and word clock signals could become out of phase, and sound might skip during the dropout - and again during recovery. In the CG-1800, if the clock drops out, a substitute reference clock signal is maintained with a high-performance holdover. During this time, the video reference and word clock signals are kept in-phase, so restoration of synchronization to the reference signal can occur without glitches - preventing video/audio noise and skipping sounds when recovering from a dropout.
Analyzer function that can measure input frequencies
In the installation of broadcasting and large-scale post-production studios, numerous connected devices and complicated wiring are common. The CG-1800 has an analyzer function that allows it to measure input frequencies, input levels and the terminations of output devices - enabling it to provide support when troubleshooting problems should they occur.
Optimal levels can be provided to other devices by adjusting wordclock output levels
Depending on the routing of wiring and the receiving devices, signal levels could be reduced - resulting in proper reception failures. Since the output of the CG-1800 can be set to multiple levels, it can provide optimal signal levels to connected devices.
Checking conditions if problems occur is possible through logging
The CG-1800 has multiple functions to support maintenance, and the identification of issues if problems occur. The analyzer function measures output device termination, input level measurement and the measurement of input frequencies. These built-in features enable the devices to provide troubleshooting support. Additionally, a logging function enables issues to be listed, and saved to a CSV file format on a USB flash drive.
Self-calibration function enables maintenance by users
Since crystal oscillators change over time, regular calibration is necessary. In order to avoid problems that could lead to broadcast trouble, timely inspections and regular maintenance are required. The CG-1800 has a self-correction function, enabling users to conduct maintenance using external signal input* and simple operations. The use of the self-calibration function requires preparation of a separate PPS-output 10MHz oscillator with a built-in GPS antenna.
Durable nut-coupling Amphenol BNC connectors
Amphenol BNC connectors on the chassis use nuts for coupling – making them very durable; also, a single circuit board is used for each connector - providing excellent resistance to the twisting and pulling of cables, and the suppression of interference between connectors.
Each connector has an independent circuit board
The construction uses a single circuit board for each connector. This provides excellent resistance to the twisting and pulling of cables and suppresses interference between connectors.