User's Manual
Table Of Contents
- 1: Purpose
- 2: Scope
- 3: VAM-CM Overview
- 4: VAM-CM interfaces
- 4.1: Absolute maximum ratings
- 4.2: VAM Control interface description
- 4.2.1: System USB description
- 4.2.2: USIM interface description
- 4.2.3: VAM control UART interface description
- 4.2.4: Analog Audio interface description
- 4.2.5: Digital Audio interface description
- 4.2.6: Power Supply interface description
- 4.2.7: External VRTC Supply Functionality
- 4.2.8: Control and ID interface description
- 4.3: Radio interface description
- 4.4: VAM-CM Power Management Handling
- 4.5: Mechanical interface
- 4.6: Environmental conditions
- 5: Evaluation tools
DRAFT
4: VAM-CM interfaces
min max Unit
Pass band impedance 50 50 Ohms
Pass band gain 2 dBic
Extended band gain 0 dBic
Axial ratio 4 dB
Extended band Axial ratio 6 dB
Extended band frequencies: RX 1518…1525MHz, TX 1668…1675MHz
Table 11. GMR external antenna requirements
4.3.2:GPS receiver antenna interface
The GPS receiver Antenna interface uses snap on SMB connector JAE SMB003D00 to provide cost
efficient and robust interfacing for RF signal.
Figure 10
shows the connector used for GPS RF receiver
antenna interface.
Figure 10. GPS receiver antenna interface connector
Signals in GMR2 transceiver antenna interface are connected as shown in
Table 10
.
Pin Signal Description
Center GPS RF Frequency: 1575 MHz – 1605 MHz
Power: -20 dBm MAX
Frame GND Signal GND
Table 12. GPS receiver antenna interface pins
4.3.2.1:External GPS antenna requirements.
External GPS antenna shall meet following requirements (RF cable losses not included in antenna
gain figures).
min max Unit
Frequency band 1575 1605 MHz
Pass band impedance 50 50 Ohms
Pass band gain 0 dBi
Table 13. GPS external antenna requirements
19:GSPS Core Module 2.0 VAM-CM HW Description
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