Technical Appendix Specifications for the RADIO SYSTEM UPGRADE

Receiver MulticouplersA. The selection and design of receiver multicoupling equipment and arrangements will be theresponsibility of the contractor, but shall comply with the following specifications in thisSection.B. Multicoupler systems shall be designed to limit receiver degradation from City or othercollocated transmitters to no greater than 1 dB. The contractor may be required to supplyadditional band-pass filters to reduce interference from nearby transmitters.C. Multicouplers shall be supplied with at least one unused (spare) port, terminated in a 50-Ohmload.D. Interconnections shall use flexible, low-loss, hard-line-type cable.E. The multi-coupler shall have a visual power supply failure alarm indicator.F. The multicoupler technical specifications are as follows:DuplexersFrequency rangePower requirementMaximum system noise figure, includingbandpass filter(s)3rd-order intercept pointMinimum 1 dB compression pointMinimum system gainMinimum Rx-Rx isolationAbsolute intermodulation suppressionTemperature rangeImpedanceAntenna input Received output connector150-174 MHz & 450-470 MHzDC5.0 dB+42 dBm+21 dBm1.0 dB20 dB-120 dBm, with two -35 dBm input signals-30 to +60 C50 OhmsMaximum input/output VSWR 1.5:1Type N femaleAll required station duplexers shall be band-pass type and equipped with N-type connectors. Allstations equipped with duplexers shall also be equipped with dual-stage isolators and low-passfilters on the transmitter inputs. Load shall be sized to dissipate 100% reflected power withoutdamage.Combiners or multicouplers equipped with duplexers do not require isolators or low-pass filters.GPS Receiver AntennasAntennas for GPS receivers (if required) and antenna mounting arrangements shall be determinedby the contractor and coordinated with City Project Manager. Installation, cable and groundingshall conform to the overall requirements for station antennas.City of San Luis Obispo 25 Radio System Upgrade TECHNICAL APPENDIX