ETSI EN 302 842-2适用于以下无线电设备类型:甚高频（VHF）数字链路（VDL）模式4航空移动（机载）无线电发射机， 在VHF频段运行的空地和空空通信用收发器和接收器，使用 高斯滤波频移键控（GFSK）调制，信道间隔为25kHz，能够 根据国际民航组织VDL的定义，调谐至112000 MHz至136975 MHz的任何25 kHz信道 SARPs[i.2]。本文件提供了技术规范的第2部分。本文件旨在确保经认证的设备与相关国际民航组织兼容 VDL SARPs[i.2]和ICAO VDL4技术手册[i.1]。注:在第5.1.4条第三时间中，如国际民航组织VDL4技术手册[i。 1] ，还没有 由于ETSI工作组的意见，本文件中的要求包括: 没有足够的证据来验证“浮动网络”的正确运行 第三时间运行的电台。制造商应注意，未来发射器和接收器的调谐范围可能涵盖任何25 kHz 从108000兆赫到111975兆赫的通道。本文件适用于“航空移动式（机载和某些情况下的地面车辆）”设备 以下将被称为“移动”设备。本文件的范围仅限于移动台。地面站的等效规范为 ETSI EN 301 842[i.5]。

ETSI EN 302 842-2 applies to the following radio equipment types:Very High Frequency (VHF) Digital Link (VDL) Mode 4 aeronautical mobile (airborne) radio transmitters, transceivers and receivers for air-ground and air-air communications operating in the VHF band, using Gaussian Filtered Frequency Shift Keying (GFSK) modulation with 25 kHz channel spacing and capable of tuning to any of the 25 kHz channels from 112,000 MHz to 136,975 MHz as defined in ICAO VDL SARPs [i.2].The present document provides part 2 of the technical specifications.The present document is designed to ensure that equipment certified to it will be compatible with the relevant ICAO VDL SARPs [i.2] and ICAO VDL4 Technical Manual [i.1].NOTE: In clause 5.1.4, Tertiary time, as described by the ICAO VDL4 Technical Manual [i.1], has not been included as a requirement in the present document due to the opinion of the ETSI Working Group that insufficient evidence was available to be able to verify correct operation of a "floating network" of stations operating on tertiary time.Manufacturers should note that in future the tuning range for the transmitter and the receiver may cover any 25 kHz channel from 108,000 MHz to 111,975 MHz.The present document applies to "aeronautical mobile (airborne and in some cases ground vehicles)" equipment which will hereinafter be referred to as "mobile" equipment.The scope of the present document is limited to mobile stations. The equivalent specification for ground stations is ETSI EN 301 842 [i.5].