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Chapter 3 New for OEM7 – Hardware
OEM729
On OEM628 receivers, the voltage provided to the LNA could be changed from the default of +5
VDC to +3.3 VDC using the ANTENNAPOWER command.
The voltage for the LNA power is not selectable on OEM729 receivers, but the OEM729 can
provide more current to the LNA. The OEM729 provides up to 200 mA of current at +5 VDC.
3.3 Environmental changes
3.3.1 Thermal dissipation
To ensure functionality and reliability, the OEM7 receiver cards must operate within the spe-
cified ambient air temperature limits (-40°C to +85°C).
The OEM7 receivers have been designed to efficiently transfer heat from the receiver com-
ponents into the printed circuit board. Mounting the OEM7 receiver on rails, or attaching heat
sinks to the mounting areas, will transfer the heat from the receiver card to adjacent circuit
boards, the enclosure or the air.
The mounting area is the area on the sides of the receiver that are outside of the keep-
out zone. See Figure 16: OEM719 Mounting Surface on page 183 and Figure 19: OEM729
Mounting Surfaces on page 199.
The best thermal mitigation comes from sinking heat through the mounting rails. This
provides more effective thermal relief than attaching a heat sink to the MINOS.
For more information about thermal dissipation, refer to the OEM7 Receiver Card Mech-
anical Integration Application Note (D19021).
3.3.2 Vibration
On OEM6 receivers, the random vibration specification is dependent on the receiver variant.
Standard OEM6 receivers were rated to 7.7g RMS (MIL-STD_810G Method 514.6, Category 24).
High vibration OEM6 receivers were rated to 20g RMS (MIL-STD_810G Method 514.6, Category
24).
All OEM7 receivers are rated to 20g RMS (MIL-STD_810G Method 514.6E-1, Category 24).
However, for high vibration installations, special considerations are required.
For more information about vibration considerations, refer to the OEM7 Receiver Card
Mechanical Integration Application Note (D19021).
3.4 Interference
Typical GNSS signal levels are in the order of -130 dBm. Spurious emissions from digital logic
(especially a microprocessor) or a nearby radio transmitter can easily meet the appropriate EU
OEM6 to OEM7 Integration Guide v1
160
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