The proliferation of the cellular telephones, PCS telephones, low power two-way radios, and wireless LANs, has created a need for tower top amplifiers (TTA). Before TTAs were in the field, radio engineers had to allow for more receiving sites than transmitting sites for many of the systems that they designed, or put up with the talk out range exceeding the talk in range. This was due to the fact that the base station transmitter is 10-300 watts in power, while the mobile and portable radios are 50 microwatts up to 50 watts in power. In the old ham radio days, we would call the system an alligator, which meant that it was all mouth and no ears. The site can could transmit to a mobile or portable station much further than the site can receive from radios in use.
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