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Channels 1-7 are the most popular because they are common between GMRS and FRS radio. The GMRS radios can allow a maximum of 5 watts of power on these channels.Channels 15-22 are GMRS channels that allow enabled full power 50 watts and repeater stations.== § 95.1773 GMRS authorized bandwidths. ==Each GMRS transmitter type must be designed such that the occupied bandwidth does not exceed the authorized bandwidth for the channels used. Operation of GMRS stations must also be in compliance with these requirements.(a) Main channels. The authorized bandwidth is 20 kHz for GMRS transmitters operating on any of the 462 MHz main channels (see § 95.1763(a)) or any of the 467 MHz main channels (see § 95.1763(c)).(b) Interstitial channels. The authorized bandwidth is 20 kHz for GMRS transmitters operating on any of the 462 MHz interstitial channels (see § 95.1763(b)) and is 12.5 kHz for GMRS transmitters operating on any of the 467 MHz interstitial channels (see § 95.1763(d)).(c) Digital data transmissions. Digital data transmissions are limited to the 462 MHz main channels and interstitial channels in the 462 MHz and 467 MHz bands.== 900 MHz ISM and non-ISM Radio ==here are frequencies that have been allocated for Industrial, Scientific, and Medical (ISM) devices to communicate. Some of these frequencies are licensed and some are unlicensed. The FCC first made unlicensed spread spectrum available in the ISM bands in rules adopted on May 9, 1985 * https://paratusradio.com/radio/ism/== Current FRS/GMRS Channels (effective September 28, 2017) ==* Note that the old GMRS channels (the 462 MHz splinter channels and the 462/467 repeater channels) were not required to narrowband.* FRS channel numbers commonly used by 22 channel radios are shown in the leftmost column.* Most 22 channel radios of this type which were formerly marketed as GMRS/FRS combination radios (radios that are not capable of repeater operation, do not include the repeater input frequencies, have a maximum power of 2 watts and have a non-detachable antenna) have been reclassified as FRS radios.See Table at: https://wiki.radioreference.com/index.php/FRS/GMRS_combined_channel_chart