Radio Communications

 

Figure 5-87. Examples of Radio Equipment

Communication VBF
The most commonly used frequency is between 40-70 MHz and 150-160 Hz. VHF radio wave emission (30-300 MHz) is emitted by the direct wave (direct wave), wave reflection (reflected wave) dalarn distance that can still be seen (within line-of-sight distance), and gclombang bending (diffracted wave) in beyond the distance that can be seen (beyond line-of-sight distance). Because there is rarely the ionosphere for short-wave beam, then this communication can not be used for long distances. However, frequent bending wave field strength enormous, for example, when the emission was cut by steep mountain.

In the event Thus, it is possible for long-distance communication, which is approximately 100 km beyond the distance that can be seen.
VHF radio communication from station to station is used for local interest with 1- 6 channels (CH). Examples transmitter, receiver and radio antenna shown in Figure 6-90 and Figure 6-91.

VHF car radio telecommunications are very important for power companies, especially in the maintenance of distribution channels. For earlier work, there are three types of stations. The first is the station object carried in the hand (portable station) that can be carried by a worker, the latter being mounted in a vehicle (mobile station) and the third is a base station (base) used in the office (substation) maintenance section for communication with the station and the object carried in the hand the car station. Typically simplex communication systems (simplex, or press-to-talk), where the talks conducted alternately.

Sometimes the base stations installed in the highest place (not in the office section) to enable communication with a further distance jets. Base station at the highest point of this is usually not manned. Examples of radio communication for maintenance shown in Figure 5-92.