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- UHF
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UHF Signal. UHF stands for Ultra High Frequency. Belongs in the radio spectrum between 470 Mhz and 850 Mhz, is used in television.
- Unbalanced signal
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In CCTV, this refers to a type of video signal transmission through a coaxial cable. It is called unbalanced beacause the signal travels through the centre core only, while the cable shield is used for equating the two voltage potentials between the coaxial cable ends.
- UPS
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Uninterruptable Power Supply. These are power supplies used in the majority of high security systems, whose purpose is to back-up the system for at least 10 minutes without mains power. The duration of this depends on the size of the UPS, usually expressed in VA, and the current consumption of the system itself.
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