Changes

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==2023.10.20: GNSS antenna changes==

==2023.10.25: GNSS antenna changes==

We would like to inform you about the GNSS antenna change for FMT100 starting from October 2023.

We would like to inform you about the GNSS antenna change for FMT100 starting from October 2023.

<br> Antenna size: 35x35x3 mm

<br> Antenna size: 35x35x3 mm

<br> Center frequency: 1575.42 MHz, 1602 MHz

<br> Center frequency: 1575.42 MHz, 1602 MHz

<br>

<br> VSWR: <1.8

<br>

<br> Average gain: -1.3 dB

<br>

<br> Return loss: < -14 dB

| style="text-align: left; background: white;" | <br> New version: [[File:FMT25.jpg]]

| style="text-align: left; background: white;" | New version: [[File:FMT25.jpg]]

<br> Antenna size: 25x25x4 mm

<br> Antenna size: 25x25x4 mm

<br> Center frequency: 1575.42 MHz, 1602 MHz

<br> Center frequency: 1575.42 MHz, 1602 MHz

<br> VSWR: <1.2

<br> VSWR: <1.2

<br> Average Gain:  -1.2 dB

<br> Average Gain:  -1.2 dB

<br> Peak Gain: < 3.3 dBi

<br> Return loss < -29 dB

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| style="text-align: left; background: white;" |Change reasons

| style="text-align: left; background: white;" |Change reasons

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'''*'''''Mounting conditions'' - device position under the hood <br>

'''*'''''Mounting conditions'' - device position under the hood from a poor location (thick metal layer above device) to an excellent location (thin metal layer above device) <br>

'''**'''''Avg. Difference from precise track'' - measured by comparing positioning data from devices and RTK (Real-time kinematic positioning) system data which is considered precise data. The smaller avvg. difference from precise track, means better track quality.

'''**'''''Avg. Difference from precise track'' - measured by comparing positioning data from devices and RTK (Real-time kinematic positioning) system data which is considered precise data. The smaller avg. difference from precise track, means better track quality.

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