Base transceiver station

In reality, the current required in conversation mode depends on the power necessary for transmission this power depends on how far the phone is from the nearest Base Transceiver Station (BTS). 

The following example is taken from the power supply to a Base Transceiver Station (BTS) in western Africa, near to the equator. ... 

A small weather station is illustrated in Figure 3.181. Such stations are usually available in both the cabled and the wireless forms to provide all the information that is needed to control and optimize the various alternative energy processes. These units are usually preprogrammed to provide simple meteorological data, and to perform the complex calculation of ETo (evapo-transpiration). The microprocessor-based systems automatically measure the variables and store the data before transmitting it to a user-supplied remote PC over distances of up to about 10 mi. The units are usually provided with a rechargeable battery pack and a spread spectrum radio transceiver. 

---