• Uses signals from the gps satellite constellation available worldwide.
• Voltage-controlled quartz or rubidium oscillator constantly drift-corrected with respect to the gps transmission.
• Very-long-term accuracy of the output approaches that of the satellites' atomic reference oscillators.
• Units do not require calibration of internal oscillators in order to maintain full performance.
• Relationship between 1hz timing output and utc is maintained so that precise relative timing can be achieved between distant installations.

Designed and manufactured under strict quality control conditions, the 1804 can be used with confidence as a frequency reference for both analogue and digital T.V. & radio transmission, in Cellular networks and for Telecommunications timing. Other applications include military communication systems, satellite ground stations and calibration-laboratory systems, particularly in connection with the development and manufacture of high-technology products. With over 1,400 installations worldwide, the 1804, now in its third-generation, continues to offer an unmatched combination of accuracy, functionality and reliability.

Product Identification:

Products in this family are divided into two main groups, which are:

1. 1804L25xxx - Quartz referenced units
2. 1804L26xxx - Rubidium referenced units
3. The 1804 is available with a wide range of options; identified by a two or three-character suffix in the type number [xxx in the above examples]

The 1804L25E8A, described in the attached datasheet became an industry standard for numerous broadcast applications, In particular it has been successful for Digital Audio Broadcast (DAB) and Digital Video Broadcast (DVB) in Single Frequency Networks where the control of both Frequency and Timing is crucial.

The Rubidium-reference 1804L26xxx versions offer exceptional accuracy for calibration-standard work or as a Master clock for satellite control centres or Telecommunications Timing. The 'stand-alone' accuracy of the reference oscillator is more than two orders-of-magnitude higher than a Quartz-referenced unit.