12/19/94 Board of Public Works Minutes

Home Browse Search

REGULAR MEETING DECEMBER 19. 1994 be required. This filter provides circuitry designed to equalize the frequency response of the receiver co -located with the voter, to the frequency response of the remote receivers to ensure that the best audio is selected for transmission. The specifications for audio response, wireline output, and equalization are to ensure adequate audio levels and audio quality are provided to compensate for telephone line losses and variations. J&K: Although the second lowest bid, not all of the equipment bid totally met all the published specifications. There are specifications that were not met for the following bid items: Repeater, both transmitter and receiver Voting system Satellite receivers We requested full equipment specifications in order to compare published specifications of the bid against the bid equipment. We have requested J&K to compare their equipment specifications against the bid specifications and provide, line for line, confirmation of each specification. All information received has been used for this discussion and evaluation. May it be noted that not all equipment specifications requested were available. The following items are of specific and serious concern: The repeater bid is not programmable for the transmitter frequency. This specification is necessary to ensure the availability and flexibility to exchange a high priority repeater with a lower priority repeater in the case of a major failure with out changing repeater components. The specified power output of the repeater with in -cabinet duplexer is necessary to meet licensed effective radiated powe ensuring adequate rf penetration into buildings and structures. Unit bid would provide approximately 91% of specification. The specifications for spurious emissions and rejections, EIA selectivity, and EIA desensitivity is to ensure the minimum amount of interference to and from the repeater and loss of receiver sensitivity. The specification for ferro-resonant power supply is to provide maximum possible built in protection from power surges without loss of operations. The specifications for voter timing is to ensure the fastest available activation of the voter to ensure any transmitted unit identification data is not clipped and/or lost. The voting system that was bid is designed to accommodate up to four receivers per voter card. This design allows for up to 32 receivers per system. Our system which has only 6 receivers would use only two voter cards. Hence, the loss of one of the two cards, that would make up our system, would be cause for the loss of up to two-thirds of the receivers at once. The desirability of individual receiver cards is that with the failure of a card, only one remote receiver is lost. The loss of multiple receivers simultaneously in this public safety application could jeopardize police officer safety and is deemed unacceptable. To ensure that proper voting occurs between the co -located and remote receivers, a voice frequency filter may be required. This filter provides circuitry designed to equalize the frequency response of the receiver co -located with the voter, to the frequency response of the remote receivers to ensure that the best audio is selected for transmission. The specifications for audio response, wireline output, and equalization are to ensure adequate audio levels and audio quality are provided to compensate for telephone line losses and variations. Emergency Radio Service Inc Although the highest bid, all of the bid equipment met or exceeded the published specifications. Specification information was forth coming as it was requested. Equipment submitted will be in manufacture for some time to come as per communications between the manufacturer and us.