Naelcom Lassen LP Clone

Replace Legacy Lassen LP Modules

Manufacturer: Naelcom
Naelcom Lassen LP Clone

NLC-LP is a GPS receiver based upon the popular Trimble Copernicus II surface-mount receiver. It has been designed to be a fit/form replacement for the end of life Trimble Lassen LP module.


Mechanical - The NLC-LP has the same mechanical dimensions as the Lassen LP. It has the same 8 pin data connector as the LP and has the same MCX antenna connector (both located in the exact same locations as found on the LP).

GPS Protocol - The Lassen LP supported Trimble's TSIP (Trimble's own binary based protocol), NMEA (industry-standard ASCII protocol) and TAIP (Trimble's own ACSII protocol). The Copernicus II supports all of these protocols.

Serial Interface - the Copernicus II has one limitation which is that the serial port parity is not configurable (only 'NO' parity is supported). Trimble's Lassen LP supported ODD, EVEN and NO parity with a default of NO parity. 

Low Power Mode - the Lassen LP supported a low power mode via pin 1. Copernicus II does not support this mode, hence this feature will not work. Pin 1 is not connected.

Performance: The Copernicus II is a far superior product to the LP. It supports more concurrent satellite tracking, faster startup and is much more sensitive.


This module can replace all released Lassen LP modules including:

  • Trimble 39263-10 Lassen LP (Non RoHS)
  • Trimble 39263-15 Lassen LP (RoHS)


GeneralL1 (1575.42 MHz) frequency, C/A code
12-channel, continuous tracking receiver
Update rateTSIP @ 1 Hz; NMEA @ 1 Hz; TAIP @ 1 Hz
AccuracyHorizontal: <2.5 meters (50%), <5 meters (90%)
Horizontal (with SBAS accuracy): <2 meters (50%), <4 meters (90%)
Altitude: <5 meters (50%), <8 meters (90%)
Altitude (with SBAS accuracy): <3 meters (50%), <5 meters (90%)
Velocity: 0.06 m/sec
Static PPS: ±60 nanoseconds
PPS (Stationary Mode "indoor" @ –145dBm): ±350 nanoseconds
AcquisitionReacquisition: 2 sec
Hot Start (with battery): 3 sec
Hot Start (no battery): 8 sec (ephemeris not older than 4 hours)
Warm Start: 35 sec
Cold Start: 38 sec
Out of the Box: 41 sec
Operational LimitsVelocity: 515 m/s
Receiver Dynamics: 2G
SensitivityTracking Sensitivity: -160dBm
Acquisition Sensitivity: -148dBm*
* For hot start with ephemeris, otherwise -146dBm
PPS3.0 V CMOS-compatible pulse, once per second
ProtocolsTSIP, default: 38400, 8, None, 1 (parity not configurable)
NMEA, default: 4800, 8, None, 1 (parity not configurable)
TAIP, default: 4800, 8, None, 1 (parity not configurable)
Note: These are the defaults of the Copernicus II - all but parity can be changed via a Trimble software tool (either individually or in batch mode)
Serial PortsTwo 3.0 V CMOS, TTL compatible serial ports
Does not support pin 1: Signal Control Power mode control interface


ElectricalPrime Power: +3.3 VDC, ±0.3V
Power consumption (board only): 58mA
Back-up power: +2.7 to +3.6V DC
Back-up consumption: 7 microAmps @ +3.0V
• I/O: 8-pin (2x4), 2 mm header

Dimensions: 66.167 mm x 31.750 mm x 12 mm
TemperatureTemperature range (operation): -40 to +85°C
Temperature range (storage): -55 to +100°C
Humidity5% to 95% RH non-condensing @ 60°C
Warranty1 Year



BoardNLC-LP-CP2 Lassen LP clone based upon Copernicus II module
Accessories66800-50 3.0V, 27dB GPS antenna, mag mount, 5 meter cable, MCX connector
66800-52 3.0V, 27dB GPS antenna, mag mount, 5 meter cable, SMA connector
57861-20 Bullet III 3.3V GPS antenna TNC connector, 30dB gain
70228-00 3.0V Hardmount GPS Antenna with TNC connector, 28 dB gain
Recab UK
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