1804 Series - 1804L25, 1804L26
GPS Precision Time and  Frequency sources
       
Click here for datasheet of typical 1804 variant   

	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.

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 1,200 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:

1804L25xxx - Quartz referenced units

1804L26xxx - Rubidium referenced units

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 below has become virtually 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.

Options: see list.

1814 series -- 1814B     Click here for datasheet of typical 1814 variant   
GPS synchronised precision time sources.
A lower-cost 'Timing-only' variant of the 1804 series.

	APPLICATIONS WHERE TIMING SIGNALS ARE THE ONLY REQUIREMENT AND WHERE RF FREQUENCY REFERENCE OUTPUTS ARE NOT NEEDED.
	LOWER COST THAN THE 1804.
	GPS-REFERENCED UTC TIMING SIGNAL OF HIGH ACCURACY, WITH OUTPUT INTERFACES THAT ARE APPROPRIATE FOR TIMING APPLICATIONS.

PRODUCT IDENTIFICATION
Products in this series are divided into two main groups, which are:

1814Bxx are Quartz-referenced units
1814Cxx are Rubidium-referenced units

The 1814 is available with some optional features; although these are restricted to those that are relevant to Timing applications. Individual variants are identified by a two-character suffix in the type number [xx in the above examples]. In this 'Timing-only' group, the 1814B1 is the baseline product, which is equipped with a simple TCXO 'keep-alive' reference oscillator, although with Timing from the GPS, accuracy remains similar to that of the 1804.

A full-function RS232 control & monitoring port is standard, with protocols similar to those of the 1804. User-programmable Timecode is also standard (IRIG-A, or IRIG-B, or XR3, or 2137 may be selected)

Options: see list.

	REPLACEMENT FOR RAPCO GPS1000 SERIES IN SATELLITE GROUND-STATION AND SIMILAR ADVANCED TELECOMMUNICATIONS APPLICATIONS.
	MORE FUNCTIONALITY FOR RACK SPACE SAVING AND COST EFFECTIVENESS.
	FROM GPS RECEIVER TO TIME DISPLAY OUTPUTS IN ONE BOX.

These units have a high-quality Vacuum Fluorescent alphanumeric front-panel display, more manual control features and extensive built-in-test (BIT) facilities. State-of-the-art reference oscillators in both Quartz and Rubidium versions, offer improved stability and accuracy compared with the GPS1000, along with higher levels of stand-alone stability during hold-over.

A fully-featured System Master-clock with Time and Frequency Outputs

19" Rack-Mount x 1U Height -- AC Powered -- DC Support
Standard Features: as 1804 series, PLUS

        80-character VFD high quality front-panel Display.
        Front-panel data-entry/control buttons.
        Powerful Built-in-Test [BIT] system.
        Premium-quality SC-Quartz OCXO / Low Phase-Noise,
        Low Ageing, Fast warm-up.
        High-performance Rubidium option.
        Timecode output: XR3 or 2137 or IRIG A or IRIG B.
        Remote-Display RS422 drive port.

Rapco's policy is one of continual improvement. We therefore reserve the right to make changes to specifications without notice.