SAM-M10Q - Integration manual
The vertical discontinuous lines in the chart area represent the offset to the center frequency in
MHz. This helps to estimate the frequency of any spurious emission seen.
In addition, u-center includes three functions commonly found in any spectrum analyzer. These
features support the RF front-end design and help to spot out any jammer presence during the
application operation.
• View / hold: if selected, the current spectrum shape freezes in a colored line. This allows for a
comparison between the time the spectrum was frozen and the real-time spectrum. This is
particularly helpful in assessing the impact of running other onboard components.
• Average: if selected, a colored line shows the averaged spectrum for each frequency. This
supports the analysis over time and obtaining a less noisy shape.
• Max hold: if selected, a colored line shows the maximum amplitude measured at each
frequency. This option helps to spot out any jammer over a period of time.
shows the spectrum view in u-center with the view/hold option selected. The redish line
represents the frozen spectrum before modifying the external gain, while the black line represents
the current measurement.
Figure 19: Spectrum analyzer view in u-center with the option view/hold selected
By changing the number of constellations enabled, the span widens or narrows. This has
a direct impact on the spectrum resolution, as the number of frequencies measured is
fixed and equals to 256. For further details about this message and how to calculate each
frequency, see the interface description [
A big spur may be visible in the center frequency. The signal comes internally from the
receiver and it does not cause any degradation in the performance.
3.3 RF design
3.3.1 Integrated antenna
SAM-M10Q antenna module is designed with an integrated multi-GNSS ceramic patch antenna.
The antenna is right-hand circular polarized (RHCP) and has a peak gain of 3 dBic.
3.3.1.1 Antenna radiation pattern
SAM-M10Q antenna radiation pattern in free space is shown in
. The antenna is measured
on a solid 50 x 50 mm
2
ground plane. The antenna RHCP gain pattern is shown in terms of
UBX-22020019 - R01
3 Hardware integration
Page 55 of 72
C1-Public
