Ublox SARA-R422 User Manual

SARA-R4 series - System integration manual
UBX-16029218 - R20 Design-in Page 72 of 128
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Table 32 lists examples of active antennas to be used with SARA-R422M8S modules.
Manufacturer
Part number
Product name
Description
Tallysman
TW3400
Active antenna– 2.5 - 16 V
GPS / SBAS / QZSS / GLONASS
Tallysman
TW3710
Active antenna, 2.5 – 16 V
GPS / SBAS / QZSS / GLONASS / Galileo / BeiDou
Taoglas
AA.162.301111
Ulysses
Ultra-Low profile miniature antenna, 1.8 – 5.5V
GPS / SBAS / QZSS / GLONASS / Galileo
Taoglas
MA310.A.LB.001
Magnet mount antenna, 1.8 – 5.5 V
GPS / SBAS / QZSS / GLONASS
Inpaq
B3G02G-S3-01-A
SMA plug active antenna, 3.3 V typical
GPS / SBAS / GLONASS
Inpaq
GPSH237N-N3-37-A
Patch circular antenna, 3.0 V typical
GPS / SBAS / QZSS
Abracon LLC
APAMP-110
Module RF antenna 5dBic SMA adhesive, 2.5 – 3.5 V
GPS / SBAS / QZSS
TE Connectivity
2195768-1
Active antenna, 3.0 V typical
GPS / SBAS / QZSS
Table 32: Examples of GNSS active antennas
2.4.4 Cellular and GNSS RF coexistence
Overview
Desensitization or receiver blocking is a form of electromagnetic interference where a radio receiver
is unable to detect a weak signal that it might otherwise be able to receive when there is no
interference (see Figure 43). Good blocking performance is particularly important in the scenarios
where a number of radios of various forms are used in close proximity to each other.
0
-120
-60
1575
Frequency [MHz]
Power [dBm]
Filter gain [dB]
1800
2025
1350
1125
GNSS signal
LTE signal
Filter response
Figure 43: Interference due to transmission in LTE B3, B4 and B66 low channels (1710 MHz) adjacent to GNSS frequency
range (1561 to 1605 MHz). Harmonics due to transmission in LTE B13 high channels (787 MHz) may fall into the GNSS bands
Jamming signals may come from in-band and out-of-band frequency sources. In-band jamming is
caused by signals with frequencies falling within the GNSS frequency range, while the out-of-band
jamming is caused by very strong signals adjacent to the GNSS frequency range so that part of the
strong signal power may leak at the input of the GNSS receiver and/or block GNSS reception.
If not properly taken into consideration, in-band and out-band jamming signals may cause a reduction
in the carrier-to-noise power density ratio (C/No) of the GNSS satellites.

Ublox SARA-R422 Specifications

General

Brand	Ublox
Model	SARA-R422
Category	Control Unit
Language	English