Two-way radio

Forty-hour training was required for personnel entering the exclusion zone, and additional supervisory training was required for site supervisors. Site control procedures described in the Site C contractor s SSAHP included maintenance of site control logs at each access point, use of red tape or chainlink fencing to demarcate hot zones, and use of the buddy system in all exclusion and contamination reduction zone areas. Site communications relied almost exclusively on visual sighting of employees the plan did not describe the use of two-way radios. This suggested that all employees in hot zones can be observed continuously from the support zones. 

In 1919, he made history with yet another of his inventions when his multiple-tuned antenna, antistatic receiver, and magnetic amplifier were used to transmit the first two-way radio conversation. This great event took place 900 miles out to sea, between the Trans-Atlantic Marconi Company station at New Brunswick and the steamship George Washington, with President Woodrow Wilson on board as a witness. 

In this section, those devices necessary for communication and integration of industrial chemical processing operations, such as electronic controllers, two-way radios, and wireless data communications are discussed. Typically, SCADA systems would also be discussed in this section however, SCADA was discussed in detail in chapter 7. 

Two-way radios, as discussed here, are limited to a direct unit-to-unit radio communication, either via single unit-to-unit transmission and reception, or via multiple handheld units to a base station radio contact and distribution system. Radio frequency spectrum limitations apply to all handheld units, and are directed by the FCC. This also distinguishes a handheld unit from a base station or base station unit (such as those used by an amateur [ham] radio operator), which operates under different wave-length parameters. 

Two-way radios allow a user to contact another user or group of users instantly on the same frequency, and to transmit voice or data without the need for wires. They use half-duplex communications, or communication that can be only transmitted or received they cannot transmit and receive simultaneously. In other words, only one person may talk, while other personnel with radio(s) can only listen. To talk, the user depresses the talk button and speaks into the radio. The audio then transmits the voice wirelessly to the receiving radios. When the speaker has finished speaking and the channel has cleared, users on any of the receiving radios can transmit, either to answer the first transmission or to begin a new conversation. In addition to carrying... 

Vapor-protective suit (meets NFPA 1991) pressure-demand, full-face SCBA inner chemical-resistant gloves chemical-resistant safety boots two-way radio communication... 

Loop testing of remote control loops is a two-person exercise, with one person located in the field and the other in the control room or instrument room. Each person must be provided with an adequate means of remote commuification (e.g., field telephones or two-way radios) as approved by the customer. 

Attorney Work Product Privileged Confidential, Do Not Disclose, Mark On, or Copy stamp and stamp pad Clipboards Permanent Markers White Board Markers Labeling Tape A flashlight A magnifying glass Two-way radios... 

The MTSO communicates with your phone over the control channel to tell it what frequencies to use, and once your phone and the tower switch on those frequendes, the call is connected. You ate talking by two-way radio to a friend ... 

Must be able to follow instructions and take directions via two-way radio or by phone. 

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