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By Paddock B.

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S. S. 1 and 919–923 Both freq. 5 W Up to 2 W licensed Unlicensed Licensed Unlicensed Both freq. up to 2 W Licensed Information based on the document by Asia-Pacific Telecommunity: Draft New APT Recommendation on Spectrum for Ultra High Frequency (UHF) Radio Frequency Identification (RFID) Devices. Tag Population Management Interrogators manage tags that are present in the interrogation zone via commands defined by the communication and data protocols. The following commands are based on the capabilities of EPC Generation 2 interrogators, and some of them may not be available in devices operating under other protocols.

Most of the interrogators support currently used air interface protocols and data standards such as electronic product code (EPC) Class 0, Class 1, Generation 2, and International Organization for Standardization (ISO) 18000-6A and B (possibly C) for ultra-high-frequency (UHF) readers, or ISO 18000-3 and ISO 15693 for high-frequency readers. Read and write ranges vary based on the interrogator's quality, tuning, the characteristics of the interrogation antenna, tags under interrogation, and present environmental conditions (including interference, RF noise, materials, and humidity).

If the channel is being used by another reader, the listening reader has to switch to another channel. This technique is mainly required in Europe by regulatory agencies. Some interrogator manufacturers include a special LBT port for a single receiving antenna, which is used for listening while the reader is operating in the LBT mode. Frequency Hopping Frequency hopping is a method of switching channels when operating in a dense reader mode. Readers may be required to hop across multiple channels within a given frequency spectrum, mainly because of the time interval restrictions for transmitting in one channel.

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A guide to online information about Peltier thermoelectric coolers by Paddock B.


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