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The ASTRO 25 core is the hub for the communications network. It comprises P25 portable and mobile radios, dispatch consoles, data applications, and RF conventional or trunked sites. [16] In addition to ASTRO 25, Motorola also builds several other P25 radio models, including the APX family of radios, designed for first responders. [17]
Motorola Type II refers to the second generation Motorola trunked radio systems that replaced fleets and subfleets with the concept of talkgroups and individual radio IDs. [1] [2] There are no dependencies on fleetmaps, therefore there are no limitations on how many radio IDs can participate on a talkgroup. This allows for greater flexibility ...
The 900 MHz frequency is also used as a reference band [2] e.g. to express the total power or impact of the electric field "E" - expressed in V/m - or the power density "S" - expressed in W/m 2 - of the overall cellular frequencies emission caused by all frequencies s.a. the four bands 850 / 900 / 1,800 / 1,900 MHz – which many GSM phones ...
An early 2000s transistor radio (Sony Walkman SRF-S84 transistor radio, released 2001, shown without earphones) Rock 'n roll music became popular at the same time as transistor radios. Parents found that purchasing a small transistor radio was a way for children to listen to their music without using the family tube radio.
An electronic kit is a package of electrical components used to build an electronic device. Generally, kits are composed of electronic components, a circuit diagram (schematic), assembly instructions, and often a printed circuit board (PCB) or another type of prototyping board. There are two types of kits. Some build a single device or system.
Motorola SCR-300 circa 1940. The SCR-300, designated AN/VRC-3 under the Joint Electronics Type Designation System, was a portable frequency modulated (FM) radio transceiver used by US Signal Corps in World War II. This backpack-mounted unit was the first radio to be nicknamed a "walkie talkie". [1]
Motorola released two GSM models for the US market; the 7000g and the 8000g. These are variants of the 70/75 and 80/85 respectively. While they are cosmetically the same and have the same features, both operate on GSM1900 instead of GSM900 thus making them compatible with the 2G networks available in the US.
The first computers bearing the Macintosh Quadra name were the Quadra 700 and Quadra 900, both introduced in 1991 with a central processing unit (CPU) speed of 25 MHz.The 700 featured identical case dimensions as the Macintosh IIci but vertically oriented as a mini-tower, with a Processor Direct Slot (PDS) expansion slot, while the latter was a newly designed full-tower case with five NuBus ...