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Novus NR3700-G-PPS User Manual
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Novus NR3700-G-PPS User Manual

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All information provided herein is the property of Novus Power Products LLC. The
information included may be reproduced without the permission of Novus Power
Products LLC. for the purpose of operating the Novus equipment.
Page #:
1 of 20
USERS MANUAL
REVISION NUMBER
DATE
NR3700-G-PPS
NMEA-PPS Source
www.novuspower.com
NR3700-G-
PPS
B
10/20/20

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Summary of Contents for Novus NR3700-G-PPS

  • Page 1 10/20/20 NR3700-G-PPS NMEA-PPS Source All information provided herein is the property of Novus Power Products LLC. The information included may be reproduced without the permission of Novus Power Products LLC. for the purpose of operating the Novus equipment. Page #: 1 of 20 www.novuspower.com...

  • Page 2: Table Of Contents

    NR3700-G- USERS MANUAL REVISION NUMBER DATE 10/20/20 Contents 1.0 Overview ........................3 4.0 Input/Output Connectors/Mechanical ..............15 6.0 Alerts-Function ..................... 17 9.0 Technical Specification ..................18 10.0 Environmental and Mechanical ................18 Appendix: GNSS Command Reference................ 20 Page #: 2 of 20 www.novuspower.com...

  • Page 3: Overview

    AC Adapter DC input to +-60vdc The NR3700-G-PPS is a GNSS locked PPS/NMEA source. Ideal for critical timing applications. The NMEA data is configurable as to the NMEA strings to be provided. PPS cable compensation is also possible through the RS232 port. The PPS can be supplied at either 3.3 or 5 Vdc CMOS.
  • Page 4 Less than 5 Watts of power from a 12 VDC nominal source is consumed. An AC power adapter is available to allow direct operation from standard AC power. Also, Novus offers related NR3700 products that can operate anywhere from – 60 to +60 VDC. Contact the factory for further details. There is a PCB assembly version of this product (NR4400) which offers essentially the same functionality and can be directly embedded in a system - smaller size and lower cost.
  • Page 5 NR3700-G- USERS MANUAL REVISION NUMBER DATE 10/20/20 The receiver needs at least four satellite vehicles (SVs) visible to obtain an accurate 3-D position fix. When travelling in a valley, or built-up area, or under heavy tree cover, you will experience difficulty acquiring and maintaining a coherent satellite lock.
  • Page 6 NR3700-G- USERS MANUAL REVISION NUMBER DATE 10/20/20 When a third satellite is detected and a range determined, a third sphere intersects the area formed by the other two. This intersection occurs at just two points. A fourth satellite is then used to synchronize the receiver clock to the satellite clocks.
  • Page 7 Antenna - SMA SMA female antenna connection. Provides internal 3.3VDC power at 20mA max. The Novus NA103 Pole Mount Antenna or the Novus NA106 Magnetic Mount Antenna are recommended for optimal performance. The receiver and companion elements generate the PPS and NMEA serial link.
  • Page 8 NR3700-G- USERS MANUAL REVISION NUMBER DATE 10/20/20 PPS (Pulse Per Second) The PPS (one Pulse Per Second) relationship with the NMEA data is shown below: The serial data timing is for the next rising edge of the PPS pulse. There are a number of attributes for the PPS that can be controlled via the RS232 port with the radio: PPS Availability There is a TCXO that is used to maintain the PPS in the event of GNSS loss.
  • Page 9 NR3700-G- USERS MANUAL REVISION NUMBER DATE 10/20/20 For applications requiring a more stable PPS – a source such as an OCXO or atomic reference should be considered. The PPS can also be enabled or disabled based upon a calculated accuracy. Cable Delays The unit can be programmed to compensate for PPS errors due to cable length.
  • Page 10 NR3700-G- USERS MANUAL REVISION NUMBER DATE 10/20/20 Output Drive The PPS pulse is a CMOS drive capable of providing 30 ma. The unit is available with either 3.3 or 5 Vdc logic levels. PPS Accuracy 15ns(1σ) (@-130 dBm) 50ns(1σ) (@-150 dBm) The nominal accuracy of a PPS signal that is directly from the radio is on the order of 25 ns rms.
  • Page 11 NR3700-G- USERS MANUAL REVISION NUMBER DATE 10/20/20 For those applications where the 5 ns of jitter is unacceptable, there is a more stable source. To solve the jitter problem, a stable oscillator is locked to the PPS and the output of the oscillator is then counted down to 1 Hz to have a jitter level that is dominated by the oscillator and associated electronics.
  • Page 12 NR3700-G- USERS MANUAL REVISION NUMBER DATE 10/20/20 What information is sent from the radio and how often, can be selected. The NMEA sentence format: Page #: 12 of 20 www.novuspower.com...
  • Page 13 NR3700-G- USERS MANUAL REVISION NUMBER DATE 10/20/20 Page #: 13 of 20 www.novuspower.com...
  • Page 14 The NMEA sentence descriptions throughout the document are for reference only. The sentence formats are defined exclusively by the copyrighted document from NMEA. There is considerable detail available from the Novus website download page: Receiver Control Information. Page #: 14 of 20...

  • Page 15: Input/Output Connectors/Mechanical

    NR3700-G- USERS MANUAL REVISION NUMBER DATE 10/20/20 Input/Output Connectors/Mechanical .499 .189 .150 .375 4. 0 3. 5 .500 Front Panel Output BNC Alert Page #: 15 of 20 www.novuspower.com...
  • Page 16 NR3700-G- USERS MANUAL REVISION NUMBER DATE 10/20/20 GNSS Ant - SMA connects to the GPS ant - provides 3.3 VDC 45mA max PPS - SMA or BNC one pulse per second RS232 - standard NMEA output NMEA-0183 Power Connector The power connector is a 2 pin terminal block connector that mates to (ON-Shore Tech Part# OSTTJ0211530).

  • Page 17: Alerts-Function

    NR3700-G- USERS MANUAL REVISION NUMBER DATE 10/20/20 1. power ground 2. power positive The unit is designed to operate from 12 VDC nominal power and is reverse polarity protected. Pin 1 is designated on the panel and is the far-right pin as directly viewed. NMEA –...

  • Page 18: Technical Specification

    NR3700-G- USERS MANUAL REVISION NUMBER DATE 10/20/20 Technical Specification Locked Stability <~E-11 after 100 seconds RS232 NMEA 0183 at full RS232 levels default is 38.4K Baud Antenna power 3.5 Vdc < 40 ma Receiver Sensitivity -155dBm 15ns(1σ) (@-130 dBm) 50ns(1σ) (@-150 dBm) RMS accuracy, 3.3 volt logic(5 vdc logic option), output impedance CMOS (±20mA) Power Requirements 9 to 15 VDC @ 1.0 amps max (10 Watts) (Voltage range -60 to...
  • Page 19 1 (one) year to be free from defects caused by faulty materials or poor workmanship, provided: (a) NOVUS is notified in writing by Buyer of such defect prior to the expiration of the warranty period, and (b) after receiving return authorization –RMA- from NOVUS, the defective item is returned with...

  • Page 20: Appendix: Gnss Command Reference

    LIMITATION OF REMEDIES : REGARDLESS OF WHETHER ANY REMEDY SET FORTH HEREIN FAILS OF ITS ESSENTIAL PURPOSE, IN NO EVENT WILL NOVUS BE LIABLE TO YOU FOR ANY SPECIAL, CONSEQUENTIAL, INDIRECT OR SIMILAR DAMAGES, INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF...