2003/07/30 Council Agenda Packet

13 frequency range. 4. Transmitters in the 108 to 225 Mhz range shall have a band pass filter providing a minimum of 15 dB of attenuation 1.0 Mhz removed from the operating frequency. Transmitters in this frequency range shall also be fitted with dual isolators providing a minimum of 50 dB isolation. 5. Transmitters in the 225 to 400 Mhz range shall have a band pass filter providing a minimum of 20 dB of attenuation 1.0 Mhz removed from the operating frequency. Transmitters in this frequency range shall also be fitted with dual isolators providing a minimum of 50 dB isolation. 6. Transmitters in the 400 to 512 Mhz range shall have a band pass filter providing a minimum of 20 dB of attenuation 2.0 Mhz removed from the operating frequency. Transmitters in this frequency range shall also be fitted with dual isolators providing a minimum of 50 dB isolation. Window filtering with broader responses may be authorized on a case by case basis. 7. Transmitters in the 512 to 746 Mhz range shall have a band pass filter providing a minimum of 20 dB of attenuation 2.0 Mhz removed from the operating frequency. Transmitters in this frequency range shall also be fitted with dual isolators providing a minimum of 50 dB isolation. 8. No broadcast transmitters in the 746 to 806 Mhz range shall be permitted in SERS facilities. 9. Transmitters in the 806 to 990 Mhz range shall have a band pass filter providing a minimum of 15 dB of attenuation 3.0 Mhz removed from the operating frequency. Transmitters in this frequency range shall also be fitted with dual isolators providing a minimum of 50 dB isolation. Window filtering with broader responses may be authorized on a case by case basis. 10. Transmitters in the 1500-2000 Mhz range shall have a band pass filter providing a minimum of 15 dB of attenuation 3.0 Mhz removed from the operating frequency. Transmitters in this frequency range shall also be fitted with dual isolators providing a minimum of 50 dB isolation. Window filtering with broader responses may be authorized on a case by case basis. Site Engineering Standards and Site User Practices The following site engineering standards and site user practices shall be observed: 1. A band pass cavity shall always be used before each receiver. A window filter may be substituted in multicoupled systems. Crystal filters are also advisable at crowded facilities. 2. A band reject duplexer may not be used unless accompanied by the required band pass cavities. A pass reject duplexer may be used, provided the duplexer band pass characteristics meet the minimum requirements for transmitter band pass filtering. 3. All cables used must, at minimum, be double-shielded with 100%braid coverage. Use of solid outer shield cables (i.e. `Heliax') is strongly encouraged. All external feed lines shall be solid-shielded. 109 Page 28 of 30