DOC 6501_Release V
ATS-6501 Users Guide
1
1 General Information
1.1 Introduction
The ATS-6501 Tflex is a state-of-the-art GPS Disciplined time and frequency reference. It
utilizes an internal rubidium (Rb) atomic clock and low noise synthesizer (LNS) in conjunction
with GPS measurements to provide outputs that are characterized by the short-term stability of
the atomic clock and the long-term stability of the GPS constellation. Additionally, it provides
the user with the capability to enhance the frequency stability and holdover performance of the
unit by using an external cesium (Cs) clock as the reference. This provides a scalable architecture
that allows users to fulfill a wide range of current and future requirements with a single unit. The
ATS-6501 is suitable for a variety of precise time and frequency applications.
The 1 Pulse per Second (1 PPS) accuracy and frequency stability of the ATS-6501 is further
enhanced by using a dual-frequency (L1/L2) GPS receiver. The dual-frequency receiver applies
corrections to the GPS timing signals that remove a significant portion of the errors due to
ionospheric delay. The measurements can also be made available to users for the purpose of
modeling the total electron content (TEC) of the ionosphere.
The SAASM version utilizes the next generation security architecture provided by the key data
processor (KDP) allowing unclassified-when-keyed operation, black key ability, and other
features available only with SAASM technology.
In applications where reliability is a must the ATS-6501 is capable of operating from an AC (100
– 240VAC, 50-60 Hz) or DC Power -48 VDC (SELV type) (-18 to -60 VDC) source and comes
with two fully redundant power supplies. The unit is capable of operating from a single supply in
the event one of the two power supplies fails.
The ATS-6511 is a fiber distribution system that derives its references and stability from at least
one ATS-6501. The ATS-6511 has two fiber I/O connections that allow for two-way time
transfer between the two systems. This capability allows the ATS-6511 outputs to be set on time
in relation to the ATS-6501 providing the reference signals and also provides for precise
calibration through the two-way time transfer. A 4372A-T module can be ordered and installed
in an ATS-6501 to supply the fiber signals to an ATS-6511. The fiber connection includes all
timing signals to provide the same capability and performance of the ATS-6501 in the ATS-6511.
A TSC-4340 distribution amplifier can be connected to a 4372A-T output to provide up to 8 more
outputs to ATS-6511s. The 4372A-T module includes input capability to monitor the status of
each ATS-6511 connected either directly to the 4372A-T module or through a TSC-4340
distribution amplifier.
1.2 Ordering Information
ATS 6501B (Tflex): Standard dual frequency GPS time and frequency standard. Dual AC input
supplies included. Requires external frequency reference or internal Rubidium reference and
includes two 1 PPS/DC IRIG, one 10 MHz, and one AM IRIG output module. A dual frequency
GPS antenna is included with unit.
ATS 6501B-xx-S00 (SAASM Tflex): Dual frequency SAASM GPS time and frequency
standard. Dual AC input supplies included. Requires external frequency reference or internal
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