Other than the justifiable flood of BPL messages of late, I do recall some
recent posts possibly involving medical equipment causing 20m interference.
As was indicated at that time, there is a designated ISM (Industrial,
Scientific, Medical) band at 13.56 MHz. If that equipment is well designed
and operated, it should not be a problem for modern communication receivers
operating at 14 MHz and above. Here is a new product announcement that
appeared in a trade industry rag sheet this morning. Pay particular note
of the effective operating range of this chip - 3mm with its on-board
antenna. Hopefully, the writing systems that will imprint the digital
information onto these ID tag chips will be "RF clean" and not located near
hams. Thankfully, the bit transfer rates are not high. Of course, the
tags will be deployed on typical consumer items and since the chip requires
RF energy just to read out its data, your friendly neighborhood retailer
will need to have one or more 13.56 MHz sources around to read the tags as
he rings up each sale.
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