MDEV-GPS-RM datasheet(19/27 Pages) LINX

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Master Development System

The RM Series Master Development System provides all of the tools

necessary to evaluate the RM Series GPS receiver module. The system

includes a fully assembled development board, an active antenna,

development software and full documentation.

The development board includes a power supply, a prototyping area for

custom circuit development, and an OLED display that shows the GPS

data without the need for a computer. A USB interface is also included

for use with a PC running custom software or the included development

software.

The Master Development System software enables configuration of the

receiver and displays the satellite data output by the receiver. The software

can select from among all of the supported NMEA protocols for display of

the data.

Full documentation for the board and software is included in the

development system, making integration of the module straightforward.

Figure 37: The RM Series Master Development System

Figure 38: The Master Development System Software

Trace

Board

Ground plane

Example Microstrip Calculations

Dielectric Constant

Width/Height

Ratio (W/d)

Effective Dielectric

Constant

Characteristic

Impedance (Ω)

4.80

1.8

3.59

50.0

4.00

2.0

3.07

51.0

2.55

3.0

2.12

48.0

Figure 39: Microstrip Formulas

Figure 40: Example Microstrip Calculations

Microstrip Details

A transmission line is a medium whereby RF energy is transferred from

one place to another with minimal loss. This is a critical factor, especially in

high-frequency products like Linx RF modules, because the trace leading

to the module’s antenna can effectively contribute to the length of the

antenna, changing its resonant bandwidth. In order to minimize loss and

detuning, some form of transmission line between the antenna and the

module should be used unless the antenna can be placed very close (<1⁄8in)

to the module. One common form of transmission line is a coax cable and

another is the microstrip. This term refers to a PCB trace running over a

ground plane that is designed to serve as a transmission line between the

module and the antenna. The width is based on the desired characteristic

impedance of the line, the thickness of the PCB and the dielectric constant

of the board material. For standard 0.062in thick FR-4 board material, the

trace width would be 111 mils. The correct trace width can be calculated

for other widths and materials using the information in Figure 39 and

examples are provided in Figure 40. Software for calculating microstrip lines

is also available on the Linx website.

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