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The contract originally specified design and development of an LNB/OMT/transmitter for operation at 13GHz receive and 12.75-13.25GHz transmit. A subsequent contract change note 001 re-specified the development of a revised version of the existing Invacom transmitter operating in the 14.0-14.5GHz band. The original TUL204 product was developed to meet the requirements of DVB-RCS systems.
The market requirement is increasingly for units to operate in custom VSAT return channel systems with different operating parameters and higher performance requirements in particular with regards to VCO Phase Noise, Gain Flatness and Output Noise. The new product is designated as TUL204E.
This new product the TUL204E has a number of performance benefits over the original TUL204 Transmitter. Most of these performance benefits have become necessary to take into account the technology differences of the TUL204 unit being designed specifically for DVB-RCS systems, and most systems now being deployed which tend to be proprietary. In general these proprietary systems typically have tighter requirements for Phase Noise, Output Noise and Gain Flatness.
The following improvements have been made on the revised transmitter.
Additional 10MHz PLL to lock an internal crystal reference oscillator to a terminal IDU reference multiplexed on the unit F-type connector,
Improved 13.05GHz main PLL for lower phase noise,
Revised and simplified IF strip for lower in band output noise,
On line tuning for reduced gain ripple,
Increased mixer dynamic range for improved manufacturability.
The project is divided into 5 Work Packages. These are :
Electrical Design (WP1) - Activities Completed