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signals in the design of the amplifier system. Adequate Radio Coverage <br /> shall include all of the following measurement requirements: <br /> 1. A minimum signal strength of-95 dBm available in 90% of the area of <br /> each floor of the building when transmitted to a belt-worn portable radio <br /> equipped with a speaker microphone, from the closest SERS site; <br /> 2. A minimum signal strength of-95 dBm received at the closest SERS <br /> site when transmitted from a belt-worn portable radio equipped with a <br /> speaker microphone from 90% of the area of each floor of the building; <br /> 3. The frequency ranges which must be supported shall be 746-824 <br /> MHz and 851-869 MHz; and <br /> 4. The signal strengths shall be present at a 100% reliability factor at the <br /> -95 dBm level. <br /> 510.5. Amplification Systems <br /> 511.5.1 Buildings and structures that cannot support adequate radio <br /> coverage, as identified, shall be equipped with either a radiating cable <br /> system or an internal multiple antenna system with FCC type accepted <br /> bidirectional amplifiers as needed. <br /> 510.5.2 If any part of the installed system or systems contains an <br /> electrically powered component, the system shall be capable of operating <br /> on an independent battery system for a period of at least twelve (12) hours <br /> without external power input. The battery system shall automatically <br /> charge in the presence of an external AC power input. <br /> 510.5.3 SERS may require that bi-directional amplifiers include filters to <br /> reduce adjacent band frequency interference at least 35 dB below the <br /> channels placed in operation by SERS. Consultation with the SERS <br /> System Manager shall be required to determine if the specific installation <br /> requires this additional filtering. <br /> 510.5.4 The SERS System Manager shall be notified two weeks in <br /> advance of when an amplification system is installed and operational. <br /> 510.6 Alternative methods. Other acceptable methods of providing in- <br /> building coverage may also include construction of low-power `filler' <br /> trunked radio sites that are integrated into the SERS. These alternative <br /> approaches may be considered where the use of bi-directional amplifiers <br /> proves impractical. Such alternative methods will require the involvement <br /> of SERS representatives in the design process. The requirements <br /> 28 <br />