DOC 4380A
4380A O & M Manual
1
098-00723-000
– Jul 2017 Revision 4.0
SyncSystem 4380A O&M Manual
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General Information
1.1 Introduction
The 4380A Sync System is a state-of-the-art GPS disciplined time and frequency reference. The low noise
synthesizer (LNS), in conjunction with GPS measurements and the Rubidium option, provide outputs that
are characterized by the short-term stability of the OCXO 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 4380A is suitable for a variety of precise time and frequency applications.
The 1 Pulse per Second (1 PPS) accuracy and frequency stability of the 4380A 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.
In applications where reliability is a must, the 4380A is capable of operating from an AC (100 – 240VAC,
50-60 Hz) or DC Power 48 VDC (22 to 60 VDC) source and comes with two fully redundant hot
swappable power supplies. The unit is capable of operating from a single supply in the event one of the
two power supplies fails.
1.2 Ordering Information
4380A (Sync System): Standard dual frequency GPS time and frequency standard. Dual AC input
supplies included. Requires external frequency reference, fiber reference, or internal Rubidium (RB). The
unit does not include any daughter cards (see below) or fiber SFP modules.
4830A-ACAC-G1R: Two AC Input power supplies. 100-240VAC, 50/60Hz with GPS and internal
Rubidium.
4830A-ACDC-G1R: One AC Input power supply, 100-240VAC, 50/60Hz and one DC input power supply
(22 to 60 VDC) with GPS and internal Rubidium.
4830A-DCDC-G1R: Two DC Input power supplies, (22 to 60 VDC) with GPS and internal Rubidium.
Input/Output Cards: The 4380A has a wide selection of input/output cards available:
1.
4376A RS-422 4 Output 1PPS Card
2.
4395B-10 Four Low Phase Noise 10 MHz Sinewave Outputs
3.
4395B-5 Four Low Phase Noise 5 MHz Sinewave Outputs
4.
4395B-1 Four Low Phase Noise 1 MHz Sinewave Outputs
5.
4394A: Programmable PPS and DC IRIG Module. Users can define the signal types and
operating parameters. Default set up is two 1PPS Outputs (Ports 1 and 2) and two DC IRIG
Outputs (Ports 3 and 4) (Default Timecode = B000)
6.
4394A-ECL Two Programmable differential PPS-ECL Outputs
7.
4387A Four Modulated IRIG Outputs (Default Timecode = B120) or NASA36.
8.
4387A-1V Four 1V Modulated IRIG Outputs (Default Timecode = B120) or NASA36
Summary of Contents for SyncSystem 4380A
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