Chapter 2 Installation of OEM7 Family Receiver Cards
OEM7 Installation and Operation User Manual v4
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2.3 Choosing a Coaxial Cable
An appropriate coaxial cable matches the impedances of the antenna and receiver (50 ohms)
and has a line loss not exceeding 10.0 dB. If the limit is exceeded, excessive signal degradation
may occur and the receiver may not meet performance specifications. NovAtel offers several
coaxial cables to meet GNSS antenna interconnection requirements, including:
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5, 15 and 30 m antenna cable with TNC connectors on both ends (NovAtel part numbers GPS-
C006, GPS-C016 and GPS-C032)
For more information about antenna cabling, including using cables longer than 30 m
and in-line amplifiers, refer to APN-077: RF Equipment Selection and Installation avail-
able from (
www.novatel.com/assets/Documents/Bulletins/APN-077-RFEquip-
).
A conversion is required between the MMCX, MMBX or MCX connector on the OEM7
receiver card and the female TNC connector on NovAtel’s GNSS antennas.
NovAtel recommends using high quality coaxial cables because an impedance
mismatch is possible when using lower quality cables and this produces reflections
in the cable that increases signal loss. Although other high quality antenna cables
can be used, the performance specifications of the OEM7 receivers are warranted
only when used with NovAtel supplied accessories.
2.4 Power Supply Requirements for Receiver Cards
OEM7 receivers require a power supply that provides:
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+3.3 VDC ±5% with less than 100 mV ripple
The requirement above works for all OEM7 receiver cards. However, the OEM7720 receiver sup-
ports a wider range of power supply voltage: +3.0 to 5.0 VDC.
If the voltage supplied is below the minimum specification, the receiver suspends
operation.
If the voltage supplied is above the maximum specification, the receiver may be
permanently damaged, voiding the warranty.
OEM7 receiver cards contain a DC-to-DC converter, tolerant to input noise and
ripple. A tightly regulated input supply is not required, as long as it falls within the
given input range.
Refer to the following for complete power specifications:
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OEM719 Electrical and Environmental Specifications
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Содержание OEM719
Страница 1: ...OM 20000168 v4 February 2018 OEM7 Installation and Operation User Manual...
Страница 123: ...Chapter 8 NovAtel Firmware and Software OEM7 Installation and Operation User Manual v4 123...
Страница 130: ...APPENDIX A OEM719 Technical Specifications OEM7 Installation and Operation User Manual v4 130 Figure 43 OEM719 Keep outs...
Страница 150: ...APPENDIX B OEM729 Technical Specifications OEM7 Installation and Operation User Manual v4 150 Figure 50 OEM729 Keep outs...
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