Tower Top Amplifier Design with Improved Failsoft Performance
Original Publication Date: 2003-Feb-03
Included in the Prior Art Database: 2003-Feb-03
A tower top amplifier (TTA) can be used to improve base station receiver sensitivity by compensating for heliax cable losses. Should a failure occur, such devices are difficult to access and repair due to their mounting location at the tops of tall structures. Some TTA designs include an automatic bypass switch in case of amplifier failure. Although system performance is severely impaired by bypassing the amplifier, this prevents total loss of receiver operation. This paper describes a design enhancement that compensates for a TTA failure by switching in a redundant preamplifier located in the equipment cabinet at the base of the tower. With this improvement only a minor degra-dation occurs to receiver performance.