Chapter 2 SPAN Installation
OEM7 SPAN Installation and Operation User Manual v14
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2.5 m and 5 m antenna cable with an SMA connector on one end and a TNC connector on the other (NovAtel
part numbers 60723177 and 60723178)
The SMA to TNC cables (60723177 and 60723178) are not recommended for permanent outdoor use.
For more information about antenna cabling, including using cables longer than 30 m and in-line amp-
lifiers, refer to APN-077: RF Equipment Selection and Installation available from (
tel.com/assets/Documents/Bulletins/APN-077-RFEquipmentSelection.pdf
).
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.
2.1.3 Mounting the GNSS Antenna
The OEM7 receiver is designed to operate with any NovAtel GNSS antenna. See
the previous page for more information.
When installing the antenna:
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Choose an antenna location with a clear view of the sky so each satellite above the horizon can be tracked
without obstruction. For more information on RF signal propagation and multipath, refer to the NovAtel applic-
ation note
APN-008 Discussions on RF Signal Propagation and Multipath
at
.
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Mount the antenna on a secure, stable structure capable of safe operation in the specific environment.
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Ensure the antenna cannot move due to dynamics.
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For dual antenna systems only
Heading accuracy is dependent on antenna baseline length. Mount the primary and secondary antennas as
far apart as possible. A minimum separation distance of 1 meter is recommended.
For more detailed information about GNSS antenna installation, refer to
APN-077: RF Equipment Selection and
at
Antenna LNA Power
NovAtel antennas and coaxial cables meet receiver RF input gain requirements. NovAtel coaxial cables are
designed to introduce no more than 10 dB loss and NovAtel antennas are equipped with built-in LNAs that
provide 29 dB of gain to the satellite signal received.
The power to the antenna LNA is provided through the receiver’s RF port center conductor.
OEM7 receivers, except the OEM7600, p5 VDC ±5% at a maximum of 200 mA. The OEM7600 provides
+3.3 VDC ±5% at a maximum of 100 mA.
Antenna supply over current protection limits the LNA power.