What happens if two or more tags are in the read field?

Tag collision occurs when more than one transponder (of the same frequency) is in the antenna field at once. Transponders are detected by the reader in milliseconds. If there is some degree of separation between tags, they have a better chance of being read. This is an issue that depends on the antenna design, the orientation of the tag, number of tags in the field and the ambient conditions of the installation. However, having a 134.2 kHz and a 125 kHz tags in the same read field at the same time will not cause collision with an ISO reader. This is because the reader switches between the two tag types. Therefore, it is possible to re-tag animals with ISO tags after they have been tagged with pre-ISO tags.

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