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Perpendicular recording (or perpendicular magnetic recording, PMR), also known as conventional magnetic recording (CMR), is a technology for data recording on magnetic media, particularly hard disks. It was first proven advantageous in 1976 by Shun-ichi Iwasaki , then professor of the Tohoku University in Japan, and first commercially ...
Perpendicular magnetic recording, a technology for data recording on hard disk PMR446 , a license-free public walkie-talkie protocol in the European Union and the United Kingdom Professional mobile radio or "private mobile radio", VHF & UHF radio networks used by operators such as taxis, utilities and emergency services
Digital mobile radio (DMR) is a digital radio standard for voice and data transmission in non-public radio networks.It was created by the European Telecommunications Standards Institute (ETSI), [1] and is designed to be low-cost and easy to use.
The term PMR is often used by the public and magazine publishing to refer to the low power (500 milliwatt) PMR446 license exempt radio systems that consist of sixteen FM frequencies between 446.00625 and 446.19375 MHz for analog FM and thirty-two FDMA (digital) channels between 446.003125 and 446.196875 MHz. These are used for personal or ...
The Baofeng UV-5R [note 1] is a handheld radio transceiver manufactured by the Chinese manufacturer Baofeng.This model was the first dual band radio (VHF/UHF) to be successfully distributed by a Chinese brand.
A dPMR Memorandum of Understanding (MoU) group was created in 2007 by a group of companies who wished to support the latest digital PMR radio technology known as dPMR. The group currently includes radio and silicon manufacturers, protocol, software and systems developers.
Norway has a Short distance radio service (called "KDR444" to distinguish it from similar services such as PMR446) with six UHF FM channels between 444.600 and 444.975 MHz. Some dual-mode KDR/PMR radios are sold but are only usable in Sweden and Norway. Norway has a 6-channel VHF FM Jaktradio (Hunting Radio) service, maximum power 5 watts.
Several hand-held Project 25 radios used around the world. Project 25 (P25 or APCO-25) is a suite of standards for interoperable digital two-way radio products. P25 was developed by public safety professionals in North America and has gained acceptance for public safety, security, public service, and commercial applications worldwide. [1]