{"id":34,"date":"2010-01-26T09:50:53","date_gmt":"2010-01-26T09:50:53","guid":{"rendered":"http:\/\/raveontech.com\/data_radio_info\/?p=34"},"modified":"2018-01-20T21:14:21","modified_gmt":"2018-01-21T05:14:21","slug":"dual-bandwidth-capable-wide-and-narrow-band-explained","status":"publish","type":"post","link":"https:\/\/www.raveon.com\/data_radio_info\/dual-bandwidth-capable-wide-and-narrow-band-explained-34\/","title":{"rendered":"Dual Bandwidth Capable. Wide and narrow-band explained."},"content":{"rendered":"

Raveon Technologies data radio modems can have either wide band IF filters, which are used on 25kHz or 30kHz spaced channels, or narrow-band IF filters, which are used on 12.5kHz spaced channels.<\/p>\n

 <\/p>\n

\"\"<\/a><\/p>\n

As the picture above illustrates, it is possible to have twice the number of radio channels, when everyone uses 12.5kHz narrow band radios.<\/p>\n

So, why is this important?\u00a0 There are two big reasons:<\/strong><\/p>\n

1. Your radio system must have receivers with the proper IF bandwidths to perform properly and meet regulatory specifications.<\/p>\n

2. In the USA, the government has mandated that all all Part 90 Business, Educational, Industrial, Public Safety, and State and Local Government VHF (150-174 MHz) and UHF (421-512 MHz) private PLMR (Private Land Mobile Radio) system licensees convert to narrow-band operation by 2013.<\/p>\n

Raveon Technologies is here to help you migrate your system to narrow-band technology.\u00a0 Our M7 series of radios supports both wide and narrow-band operation, and our new VHF M7 <\/a>supports both in the same radio.<\/p>\n\n\n\n\n\n\n\n
\u00a0<\/em><\/strong><\/td>\nWide Band<\/strong><\/td>\nNarrow Band<\/strong><\/td>\n<\/tr>\n
Channel Spacing<\/strong><\/td>\n25kHz or 30kHz<\/td>\n12.5kHz<\/td>\n<\/tr>\n
Actual receiver IF filter bandwidth<\/strong><\/td>\n15kHz<\/td>\n7.5kHz<\/td>\n<\/tr>\n
Maximum data rate with \u00a0standard modulation<\/strong><\/td>\n9600 baud<\/td>\n4800 baud<\/td>\n<\/tr>\n
Maximum data rate with \u00a04-level modulation<\/strong><\/td>\n19200 baud<\/td>\n9600 baud<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Because the IF bandwidth in a narrow-band radio must be 1\/2 the bandwidth of a wide-band radio, the over-the-air data rate will be 1\/2 also.\u00a0\u00a0 And unlike other brand radio modems that loose sensitivity when operating on narrow channels, the M7 series of radios has the same high receiver sensitivity on both wide and narrow-band channels.<\/p>\n

Raveon’s UHF data radio modem, the RV-M7-U<\/a>, may be ordered as either a wide-band or a narrow-band radio.\u00a0 It is configured at the factory for one or the other.<\/p>\n

Raveon’s new VHF data radio modem, the RV-M7-V<\/a>, is dual-bandwidth capable and user-configurable\u00a0for either\u00a0 wide-band or narrow-band .\u00a0 It has\u00a06-channel memories in it, and each channel may be set to either wide or narrow band.<\/p>\n

A narrow-band radio can usually communicate with a wide-band radio, if they are set to the same over-the-air data rate as the narrow-band radio.\u00a0 But because the wide-band radio has overly-wide IF filters for the signal, the communication range will not be as good as two narrow-band or two wide-band radios communicating.<\/p>\n

A wide-band radio will not communicate with a narrow-band radio.\u00a0 In the voice world it might work, but in the data world, the narrow IF filter in a narrow-band radio will filter off the wide-band signal, and no reliable communications will be possible.<\/p>\n

So, if you are migrating your wire data system, SCADA system, or telemetry system\u00a0from wide to narrow-band, you must make sure all radios in the system have the same IF bandwidths and over-the-air data rates.\u00a0 Please contact Raveon Technologies for either wide-band or narrow-band data radio modems.<\/p>\n

Links to FCC Documents regarding the narrow-band migration:<\/p>\n

< http:\/\/hraunfoss.fcc.gov\/edocs_public\/attachmatch\/FCC-04-292A1.doc<\/a>><\/span><\/p>\n

< http:\/\/hraunfoss.fcc.gov\/edocs_public\/attachmatch\/FCC-04-292A1.pdf<\/a>><\/span><\/p>\n

< http:\/\/hraunfoss.fcc.gov\/edocs_public\/attachmatch\/FCC-04-292A1.txt<\/a>> <\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Raveon Technologies data radio modems can have either wide band IF filters, which are used on 25kHz or 30kHz spaced channels, or narrow-band IF filters, which are used on 12.5kHz spaced channels.   As the picture above illustrates, it is possible to have twice the number of radio channels, when everyone uses 12.5kHz narrow band […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[3],"tags":[],"_links":{"self":[{"href":"https:\/\/www.raveon.com\/data_radio_info\/wp-json\/wp\/v2\/posts\/34"}],"collection":[{"href":"https:\/\/www.raveon.com\/data_radio_info\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.raveon.com\/data_radio_info\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.raveon.com\/data_radio_info\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.raveon.com\/data_radio_info\/wp-json\/wp\/v2\/comments?post=34"}],"version-history":[{"count":13,"href":"https:\/\/www.raveon.com\/data_radio_info\/wp-json\/wp\/v2\/posts\/34\/revisions"}],"predecessor-version":[{"id":1201,"href":"https:\/\/www.raveon.com\/data_radio_info\/wp-json\/wp\/v2\/posts\/34\/revisions\/1201"}],"wp:attachment":[{"href":"https:\/\/www.raveon.com\/data_radio_info\/wp-json\/wp\/v2\/media?parent=34"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.raveon.com\/data_radio_info\/wp-json\/wp\/v2\/categories?post=34"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.raveon.com\/data_radio_info\/wp-json\/wp\/v2\/tags?post=34"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}