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Recent content by rokor

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    A Challenge: RF propagation between cargo containers

    The antenna module in the form of a "brick" filled with RF-transparent epoxy is about 20cm X 15cm X 2cm size, and placed on the top front corner of container, about 20cm from the front and 50cm from the side. So position is pretty much in the corner, and this is most protected zone from the...
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    A Challenge: RF propagation between cargo containers

    If we want to put 2 antennas to fight dead zones, can we operate 2 antennas simultaneously (share of power, unbalanced impedance)? If loss of power is an issue and we still want to switch, then how we can switch 2 antennas without mechanical relay (battery life etc.). Are there available solid...
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    A Challenge: RF propagation between cargo containers

    You got it, Flatulent. We already duplicated the satellite uplink by GSM/GPRS quad band transceiver for on-land tracking. It works fine on stand-alone (or on-top of stack) container. The units will have the “sleep mode” for battery saving. Alarm or timer will awake the processor. How often it...
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    A Challenge: RF propagation between cargo containers

    Thanks everybody for deep analysis. Yes we are trying to track (position and various sensors alert) EACH container ANYWHERE on Earth, on land (truck, train, yard) and in the sea. So far nobody could do this with guaranteed coverage and stable back link. There is a huge demand in this feature...
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    A Challenge: RF propagation between cargo containers

    About solar panel issue, there will be a rechargeable battery, supporting at least 30 days of independent operation (no sun exposure). This should be good enough for one shipment cycle. Also, we can’t have a RF-transparent “windows” in container, we just place our antennas on the top...
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    A Challenge: RF propagation between cargo containers

    How far RF signal (2.4 GHz, 802.15.4 standard) can travel between containers? Average cargo container size: Width 8 feet (2.5 M), Height 8.5 feet (2.6 M), Length 20 feet (6 M) or 40 feet (12 M). Containers may be stacked up to 6 levels vertically, up to 12 rows wide and 15 rows long. The...

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