请教300220中narrowband与wideband 怎么判断
ETSI EN300220-1V2.1.1(2006-04)版本中定义narrowband:equipment to be used in a non-channelized continuous frequency bandof equal or less than 200 kHz, or equipment to be used in a channelized frequency band with a channel spacing of equal or less than 200 kHz.相对的宽带设备>200kHz;200KHZ指的是调制带宽?但是在 ETSI EN300220-1V2.3.1(2009-04)版本中定义窄带:equipment to be used in a non-channelized continuous frequency band with a channel bandwidth of equal or less than 25 kHz, or equipment to be used in a channelized frequency band with a channel spacing of equal or less than 25 kHz.宽带对应>25kHz. 怎么定义都变化这么大,另外注意到以前比较老的版本2000版本也是于25kHz .
到底怎么来介定宽带设备还是窄带设备?non-channelized 和channelized又怎么来理解呢?非信道化和信道化,具体怎么理解?
页:
[1]
