BL28EU-RD1 OEM Manual and User Guide BL28EU-RD1 OEM Manual and User Guide v 1 (to be used for certification) FCC ID: LHJ-BL28EURD1 IC: 2807E-BL28EURD1 0
BL28EU-RD1 OEM Manual and User Guide Terms and Acronyms • • • • • • • • • • • • • • • • • • • • • • • CDMA DCM DRX ES FDD GLONASS GNSS GPIO GSM HU HSIC LTE MP NAD OEM PCB PHY SIM TCU TDD TSP UMTS WCDMA Code Division Multiple Access Data Connectivity Module Discontinuous Reception Engineering Sample Frequency Division Duplex GLOBal’naya NAVigatsionnaya Sputnikovaya Sistema Global Navigation Satellite System General Purpose Input Output Global System for Mobile Head Unit High Speed Inter-Chip Long Term Evo
BL28EU-RD1 OEM Manual and User Guide BL28EU-RD1 Module The BL28EU-RD1 NAD is a proprietary modem module designed by Continental Automotive Systems, Inc. The modem will be integrated into Data Connectivity Modules (DCMs) or Head Units (HUs) designed and produced by Continental or by a 3rd party for use by automotive OEMs. DCMs will be installed into vehicles during the OEM’s factory assembly process and will not be accessible without use of special tools.
BL28EU-RD1 OEM Manual and User Guide non inclus dans cette liste, et dont le gain est supérieur au gain maximal indiqué, sont strictement interdits pour l'exploitation de l'émetteur.». 3 Device Installation and User Manual The BL28EU-RD1 module is a proprietary product designed and manufactured by Continental Automotive Systems, Inc. for integration into telematics control units manufactured by Continental Automotive Systems, Inc. for automotive OEMs. i.
BL28EU-RD1 OEM Manual and User Guide • «Le présent émetteur radio (ID: LHJ-BL28EURD1; IC: 2807E-BL28EURD1) a étéapprouvépar Industrie Canada pour fonctionner avec les types d'antenne énumérés ci-dessous et ayant un gain admissible maximal. Les types d'antenne non inclus dans cette liste, et dont le gain est supérieur au gain maximal indiqué, sont strictement interdits pour l'exploitation de l'émetteur.
BL28EU-RD1 OEM Manual and User Guide 6.2 RF Traces for antennas The NAD has three antenna pins. • PRIMARY_ANT • SECOND_ANT • GNSS_ANT The figure below shows the general breakout of the module: Figure 6-2: NAD Pin Breakout The LTE CAT4 NAD should be oriented on the main board to minimize the length of the PRIMARY_LTE antenna pin (LTE Ant1). This 50ohm line should be as short as possible to the external RF connector or internal antenna feed point.
BL28EU-RD1 OEM Manual and User Guide The RF traces from the NAD antenna pins on the main board can be stripline or microstrip. For the stripline approach, vias should be placed to the NAD EDGE SIDE of the pins as close as possible to the NAD antenna pads to minimize any impedance discontinuity (see figure 38). For the microstrip approach, the PCB insertion loss will be less but the short route under the NAD MUST BE TREATED AS STRIPLINE SO IT WILL BE NARROWER UNDER THE NAD THAN THE MICROSTRIP LINE.
BL28EU-RD1 OEM Manual and User Guide Figure 6-3 Assume the main PCB above with a 6 layer stackup with ground cut away on layer 2 so the microstrip lines reference ground on layer 3. The dielectric thickness from L1 to L3 is 21.2 mils. Using an online impedance calculator, the line width under the NAD for a 50 ohm line is 16.9mils (433micron) shown below: BL Figure 6-4 The calculation for the microstrip line width outside the NAD is 37.
BL28EU-RD1 OEM Manual and User Guide Figure 6-5 Due to the nature of the weave chosen for each PCB, the dielectric constant of the NAD board is 4.1 while the main board is 4.3. A dielectric constant of 4.2 was chosen in the stripline calculation, while 4.3 was used for the microstrip calculation. Main board stack up may vary so these line widths may need to be recalculated.
BL28EU-RD1 OEM Manual and User Guide 6.3 RF Antenna Layout Parameters Type of Guidance Trace impedance Total route length Ground between signals Spacing to other signals • • • • Requirement 50-Ohms ±10% single-ended <100-mm > 3 x line width of ground trace between, stitched VIA to ground < 3:1 Signals should be routed along similar route path, but separated by ground trace. Trace impedances should match the table, either as microstrip or stripline. Total length for both signals should match the table.
