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Hmvall Preliminary Technical Assessment Table 1: Bounded Area Coverage /CTAP-HUHA-PREASSESS-001-RO Tx Frequency (MHz) Coverage Percentage Area Covered (kmx) 861 35.5% 3818.6 769 37.1 % 3988.5 155 50.7% 5459.1 Although not as disparate as the coverage comparison conducted by Macro, these results do show that necessary coverage could be provided with fewer VHF sites. How many less depends on many factors that would have to be studied in detail. The State of Oregon recently conducted a comparison of coverage from test sites using both VHF and 700 MHz. The report on this study is expected to be published in October. This document can be used by the County of Hawaii in comparison of its own sites. 2.2 Simulcast Modulation The Conceptual Design Analysis & Recommendation Report states that the simulcast modulation scheme will require Linear Simulcast Modulation (LSM). We have a concern about this for the proposed Request For Proposal (RFP) because if LSM is required, competition will be eliminated. We recommend that the requirement for simulcast be any system compliant with the Standard Simulcast Modulation as defned by the Telecommunications Industry Association (TIA). TIA-CAAA-C is a new document that TIA has voted to publish and will release shortly which will define Standard Simulcast Modulation. If the RFP is written so it requires compliance to the TIA-CAAA-C standard vice LSM, it will allow for open competition. It should be the vender's choice as to which of the Standard Simulcast Modulation formats that they utilize as long as they can meet or exceed system coverage and availability. The simulcast method that is chosen for use at the fixed end will be compatible with all P25 subscriber radios from any vendor due to the use of a standardized method. The Macro proposal utilizes several simulcast cells plus a number of stand alone (non-simulcast) sites. The cost of developing simulcast cells is more expensive due to the additional equipment required and may not be required in some cases. ICTAP recommends allowing any potential vendors to propose their breakdown of areas requiring simulcast or if simulcast is even required. 2.3 Interoperability Enhanced interoperability is one of the stated goals for the project. Below is a quick look at the major on and off island radio systems: On island systems: • The State DoT, Airports Division has an 800 MHz Motorola trunked radio system. This is a proprietary radio system. • The State Department of Public Safety, State Sheriffs has an 800 MHz Motorola conventional system. • The State Department of Land and Natural Resources has a VHF conventional system. • The State Medicom system utilizes a UHF conventional system. • Federal Law enforcement is in the VHF band. October 2008