| CNS Systems, Inc. |
 For additional information, contact info@cnssys.com. |
The CNS Clock IIThe CNS Clock II is a GPS clock with high accuracy one-pulse-per-second outputs and software that manages the clock and keeps your computer's time synchronized to GPS. |
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The CNS Clock II is available in a rack mount version that allows up to two clocks per 1.25 inch ("1U") panel. |
External signal interfaces:
A high efficiency switching power supply that operates from any 9-30 volt DC source. This input is polarity independent and can even be powered by low voltage AC if necessary.
Battery Backup so the GPS receiver can wake up "smart."
Provides 3 or 5-volt dc power for an amplified GPS antenna.
Tac32 software with a wide range of timing features as well as self-survey, logging, 1PPS steering, and PC clock synchronization.
EMI certified to FCC Part 15, Subpart B.
Accuracy: In position hold mode,<20 nsec 1-sigma with SA off.
Hardware: The core of the CNS Clock II is a GPS receiver module. The standard version of the CNS Clock II features the best available GPS receiver, the Motorola M12+ Timing module.
Each of the external 1PPS output signals are independently buffered to improve their drive capabilities and to prevent damage to the GPS receiver module. The buffers will drive +3 volts into a 50 ohm termination with a rise time of <10 nsec. The normal logic polarity is positive going at the epoch time, but this can be inverted if desired.
An RS232 driver provides 1PPS time synchronization to an attached computer. The 1PPS signal is normally connected to the computer's DCD input but connection to CTS or DSR is supported.
The RS232 I/O ports are buffered and isolated from the GPS receiver module.
Two RS232 ports are provided, a primary
and a secondary. This allows, for example, control and monitoring
using Tac32 software on one port while the other port is used for a second
computer, running NTP software.
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External Interfaces:
The interface is designed to connect directly to a variety of pager terminals
by using the terminal's "Busy" line. This includes thee Zetron 2200,
Kantronics Model 2000, Motorola Unipage M15 Paging Terminal and the
GlenAyre GL3000.
The interface is an opto-isolated solid state switch that operates much
like a relay. When closed, the circuit must not draw more than 100ma.
When open, the terminal voltage must not exceed 50 volts. The two interface
pins may be connected in either polarity as they are polarity independent.
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CNSC02-A (Standard) Tac32Plus GPS Time and Control software.
Tac32 displays the current UTC or local time in BIG DIGITS. It also includes date, day-of-week, day-of-year, Local and Greenwich Mean Sidereal times, Julian Date, Modified Julian Date, and current GPS week.
Other features include data logging in various formats; audible time ticks; automatically sets the PC's internal clock; corrects for time delays in antenna and measurement cables; satellite display with bar graph "S-meter"; self-survey; timing, position and DGPS operating modes (for VP receivers only); configuration selections are saved and restored.
Tac32 runs on Windows 95, 98, ME, NT4, 2000, XP and 2003 server.
Tac32Plus is now standard with the CNS Clock II. It has all the features of Tac32 plus it adds advanced capabilities that support professional applications:
CNSC02-SM Substitute Tac32Multi GPS Advanced Time and Control software for the standard Tac32 software. Tac32Multi has all the features of Tac32Plus plus it can simultaneously manage up to eight Time Interval Counters.
CNSC02-O1 High Performance PPS
Provides for dynamic hardware correction of the 1PPS quantization ("sawtooth") error. This reduces the noise on the 1PPS pulses from (typically) +/-27 nsec (15 nsec 1-sigma) to +/- 11 nsec (3 nsec 1-sigma). More importantly, eliminates periods of bias error caused by the quanization error going through a "zero beat" period that can last one to two minutes about every 10 minutes or so.
CNSC02-O2 IRIG-B The IRIG-B Module provides an industry standard IRIG-B modulated time code signal on a rear panel BNC connector. The signal is buffered so that it can drive long lengths of 50 ohm coaxial cable (RG-58 or equivalent). The module can also be set by an internal jumper to provide a non-modulated IRIG-B signal for short length interconnects.
IRIG-B time code signals are available in any of the three IRIG-B modulation schemes as defined in IRIG STANDARD 200-98, May 1998. These are the Amplitude Modulated Carrier (standard), Pulse Width Code, and the Manchester modulated waveforms. This includes modes B000, B003, B120, B123, B220, and B223 (CF bits set to zero unless otherwise specified). The selection is by internal jumper. Custom applications using the control function (CF) bits are possible. Contact CNS Systems for information.
CNSC02-O3 Sequencer Module The Paging Sequencer Module is designed to control the Active/Busy states of a paging transmitter station as a specific portion of each minute to allow spectrum sharing with adjacent paging systems that have overlapping coverage areas.
The interface is designed to connect directly to a variety of pager terminals by using the terminal's "Busy" line. The Zetron 2200 "Busy" interface is on the Station Card. The Kantronics Model 2000 is supported by connecting the interface to the External Carrier Detect line. On the Motorola Unipage M15 Paging Terminal connect to "Busy Channel Control" and "Ground" (pins 45 and 50) on the standard 25-pair punch block. The GlenAyre terminal is also supported. The interface is an opto-isolated solid state switch that operates much like a relay. When closed, the circuit must not draw more than 40ma. When open, the terminal voltage must not exceed 30 volts. The connector on the rear panel of the CNS Clock II is a 2-part Phoenix that allows a pair of wires to be connected to compression terminals without the need to worry about polarity. The driver circuit eliminates the possibility of ground loops between the paging system and the CNS Clock II.
CNSC02-O4 Genisys Module
Provides an extended GENISYS / PRCCI protocol interface with the MICROLOK II, used by the railroad industry.
CNSC02-O5 RS-485 RFID Timecode Module
Provides GPS-based TDM timing pulses to synchronize toll plaza readers for high speed, multi-lane applications to enable the reading of new eGo and existing ATA, Title 21/Amtech Allegro, and MARK IV/IAG tags. Also provides an inexpensive way to multiplex Airport tag readers at different sites, and for multiple protocols, allowing eGo tags to be used at airports in the region of an existing Title 21/Amtech Allegro or Mark IV/IAG tag population.
CNSC02-O6 Ethernet with NTP
Provides a Network Time Protocol (NTP) service through an RJ-45 front panel Ethernet jack. A Web browser can be used to configure port, including its IP address.
CNSC02-O7 Steered TCXO with 10MHz output (2.5 ppm before steering). Prerequisite CNSC02-O1 High Performance PPS.
CNSC02-O8 Steered OCXO with 10MHz output (0.02ppm before steering). Prerequisite CNSC02-O1 High Performance PPS.
CNSR01 Rack Mount Kit for single or dual CNS Clock II in a single 1U height rack panel.
Custom configurations are also available. Please call for more information.
| AR-10S
Antenna: The AR-10S is a high performance GPS patch antenna combing
a state-of-the-art low noise amplifier with a low profile, compact, fully
waterproof enclosure. When connected to a GPS receiver with 2.5-5.5 VDC antenna
power, the AR-10S provides excellent signal amplification in addition to
out-of-band filtering & rejection.
A 28 dB active patch, the AR-10S antenna operates from 2.5 to 5.5 VDC at just 12 mA supplied by the CNS Clock II. The AR-10S features a 5 meter 1/8 inch diameter RG-174 coaxial cable with BNC connector (a BNCTNC adaptor is needed for use with the CNS Clock II). The antenna design reflects a high standard for performance when operating in foliage/urban canyon environments and in the presence of electromagnetic interference. |
$49.00 |
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| Timing 3000 Antenna: The double-filtered Timing 3000 provides a cost-effective solution for fixed location applications in areas of high EMI and long term exposure to the elements. The 25dB signal gain allows for optimum system performance over a wide variety of cable lengths. (Cable assembly and mounting bracket shown in photo are sold separately). Click on the picture of the antenna at the right to access the product brochure in Adobe Acrobat format (requires Acrobat Reader V6.0 or newer). The Timing 3000 is a 100% form, fit, function replacement for the original (now discontinued) Motorola Timing 2000 GPS Antenna. |  |
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| VIC-100
Timing Antenna: A high performance active antenna with vertical cable
feed. Designed for easy installation. Click on the picture of the antenna
at the right to access the product
brochure in Adobe Acrobat format (requires Acrobat
Reader V6.0 or newer).
General Specifications:
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Available with TNC, N and N+Mount |
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VIC100TNC VIC100NMNT VIC100N |
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| Coaxial
Cable: For lengths up to 200 feet, LMR-240 cable from Times Wire is
a very good choice. This cable is about the size and flexibility of CATV
cable but is 50 ohms impedance and has loss characteristics similar to
RG-213 while being half the diameter of RG213.
Specifications: Loss at GPS frequency is approximately 9db/100 feet. Has .059" center conductor with micro-cell foam dielectric & type IIIA non-contaminating jacket. Nominal impedance 50 ohms, velocity of propagation 82%; outer diameter .240"; 100% Al mylar & 95% tinned Cu braid. Preassembled cables with TNC connectors and weatherproof heatshrink tubing are available in standard lengths of 50, 75, 100, 150 and 200 feet. Custom cables of any type coax, in any length and with any connectors are available. These can usually be shipped within 5 business days. Call or e-mail for quotes. |
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OrderingSee the ordering page for expanded parts list and ordering information. |
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