Related Manuals for Furuno GT-87
Summarization of Contents
RF Section PCB Layout Design
PCB Ground Layout Design
Ensures proper ground plane layout for RF signal lines to minimize noise and signal shortage.
Microstrip Line Design
Guidelines for designing 50-ohm microstrip lines for optimal RF reception performance and minimal loss.
ESD Protection by λ/4 Short Stub
Implementing a λ/4 short stub for robust ESD protection on RF lines.
DC Feed Inductor
Selecting an appropriate inductor for biasing active antennas, considering SRF, impedance, and current ratings.
Antenna Interface
LNA Gain Selection
Configuring LNA gain modes for different antenna types to optimize performance and power consumption.
Bias Circuit Design for Active Antenna
Methods for supplying bias voltage to active antennas using module's VCC_RF or external VANT.
Passive Antenna Connection
Guidelines for connecting passive antennas, stressing minimal signal path loss for sensitivity.
SAW Filter Insertion
Advice on adding a SAW filter to mitigate strong interference and prevent LNA saturation.
Antenna Detection Circuit
Antenna Detection Circuit Overview
Overview of digital pins (ANT_DET0/1) for sensing antenna connection status and reporting via serial communication.
Antenna Detection/Protection Circuit
Details the circuit for antenna detection and over-current protection using comparators and transistors.
Modification of Antenna Short/Open Threshold
How to adjust antenna open/short detection thresholds by modifying resistor values in the circuit.
Modification of Over Current Protection Threshold
Method for setting the over-current protection threshold by adjusting resistor R2.
Layout Design with Patch Antenna
Incurrence to Antenna Characteristics by Layout
Impact of PCB layout on patch antenna characteristics such as gain, axial ratio, and directivity.
Noise Influence Issue by Layout
Addressing noise influence from via holes on the bottom side of the patch antenna layout.
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