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無線電設備與服務檢測項目報價???解決方案???檢測周期???樣品要求? |
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本標準規定了我國職業的分類結構、類別、代碼及說明。本標準適用于按職業分類的各種普查、調查統計及行政管理和國內外信息交流等。
GB/T 30269的本部分規定了470 MHz~510 MHz頻段高可靠性無線傳感器網絡的物理層和媒體訪問控制層技術規范。本部分適用于短距離智能無線抄表、智能家居控制等應用。
GB/T 30287的本部分規定了衛星定位船舶信息服務系統(以下簡稱系統)的體系結構和功能描述。本部分適用于通過衛星定位技術、采用公眾移動通信網絡或專用移動通信網絡、具有船舶信息服務中心的信息系統,可作為系統設計依據。通過非衛星定位技術、具有船舶信息服務中心的信息系統亦可參照執行。
本標準規定了采用碼擴正交頻分多址(CS-OFDMA)工作方式的SCDMA寬帶無線接入系統的技術要求,包括:系統參考模型;工作頻段、接口、功能、業務等技術要求;基站、業務匯聚網關等設備或模塊的功能、性能指標;電源、環境適應性和電磁兼容等要求;以及操作維護要求。 本標準適用于采用碼擴正交頻分多址工作方式、工作頻段符合無線電管理機構規定的SCDMA寬帶無線接入系統的網絡設備。
本部分規定了家庭能源網關的功能要求、電氣性能、通信性能、電磁兼容要求、機械性能、適應環境、可靠性要求、檢驗規則。本部分適用于家庭能源網關的研發、生產、使用和檢驗。
that HF sky-wave links allow communication over large distances
The ionospheric channel provides the connectivity for the links in an adaptive HF radio circuit or network. To provide proper utilization of this resource the radio system must operate on the ideal frequency or as close to it as practical. This may be the
The passive radio astronomy service (RAS) is studying natural phenomena producing radio emissions at frequencies fixed by the laws of nature. Primary allocations have been made to various space services in the Earth-to-space direction such as the fixed-satellite service (FSS), radionavigation-satellite service (RNSS), mobile-satellite service (MSS) and broadcasting-satellite service (BSS) in bands adjacent or nearby to bands allocated to the RAS.
This Report provides information on the current status of terrestrial electronic news gathering (ENG), television outside broadcast (TVOB) and electronic field production (EFP) systems.
The purpose of the Report is to define the public protection and disaster relief (PPDR) objectivesand requirements for the implementation of future advanced solutions to satisfy the operationalneeds of PPDR organizations around the year 2010. Specifically, it identifies objectives, applications, requirements, a methodology for spectrum calculations, spectrum requirements and solutionsfor interoperability
considering that the Radiocommunication (ITU-R) Study Groups are charged to focus on the following in the study of Questions assigned to them
This Recommendation associates the published core network standards from standards development organizations (SDOs) with those 3GPP2 specifications that were approved as of 17 July 2001 for the IMT-2000 family member \"ANSI-41 evolved Core Network with cdm
This Recommendation associates the published core network standards fi-om the regional standards development organizations (SDOs) with those 3GPP2 specifications that were approved as of 11 July 2002 for the IMT-2000 family member \"ANSI-41 evolved core ne