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This is a good question for an engineer, so I spoke with James Heurich at RFID Inc., who had some good suggestions. First of all, if you increase or decrease the antenna cable length of an LF reader, you have detuned the antenna. So 125 KHz could be transmitting at 115 or 135 KHz. This is all dependent on the source of the reader and antenna. Heurich notes that increasing cable length from 12 feet to 30 feet of cabling tends to result in a 15 percent loss of read range. However, if your reader is not designed to work with an external antenna, or if you’re going from a 2-foot to a 33-foot cable, that can result in dramatic loss, or even a zero read range. A lot will depend too on the power of the reader.
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