Radiofication: sound broadcasting system

Radiofication is a sound broadcasting system in which audio (speech, music) is transmitted to a large number of listeners (subscribers) using electrical oscillations. These oscillations propagate through wired networks (standalone, paging, or telephone).

Advantages and prospects

The main advantages of radiofication are its high cost-effectiveness and reliability, high transmission quality, and ease of use with subscriber loudspeakers. The development prospects of this system are mainly related to the need for population notification according to civil defense requirements.

Installation of radiofication feeders

The installation of radiofication feeders is undoubtedly an important and complex process, requiring a qualified approach and execution according to approved standards. Improper installation of the radiofication feeder usually leads to signal degradation and interference in telephone, intercom, and other lines, which in turn affects communication quality. The radiofication feeder is laid as overhead lines. When laying the feeder cable along external or internal walls and between floors, a separate cable duct is allocated.

Asymmetry and its impact

A properly functioning feeder is symmetrical and therefore does not cause interference. Improper installation and insulation of the radiofication feeder cause asymmetry — the entire feeder network becomes a low-frequency antenna, creating the "radio in the phone" effect. Asymmetry occurs when the wire transmitting any signal surrounds itself with an electromagnetic field. The second wire of the pair, with current flowing in the opposite direction, fully balances this interference field. If one of the pair's wires is disconnected or grounded, balancing does not occur. The signal in such a pair creates interference in the cable, and any interference penetrates this line. Thus, asymmetry affects the network's immunity to interference and its influence on other networks.

Implementation of the radiofication network

The implementation of radiofication networks for facilities is carried out using a two-core copper cable in a grounded metal conduit. Without a metal conduit, installation is done no more than 100 cm from the distribution box or outlet. Connection of a stationary loudspeaker to the line is performed with a series-connected limiting resistor of 80 ± 20 Ohms located in the subscriber outlet. The resistor installation can also be done in a distribution box under a suspended ceiling or fixed to a wall. In some cases, the limiter is located in a distribution cabinet, preventing access by unauthorized personnel. The limiting resistor prevents a short circuit of the entire radio communication line in case of radio point failure or unauthorized modification (e.g., removal of the distribution transformer).

Integration of departmental and wired broadcasting

With the development of modern departmental broadcasting networks, there is an opportunity to combine departmental and wired broadcasting into a single system — this significantly reduces the costs of building internal radiofication systems and requires additional coordination.

Interested in implementing or upgrading the radiofication system at your facility? Get a consultation from our specialists!

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