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/* Current FRS/GMRS Channels (effective September 28, 2017) */ new section
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== Part 90 Radios ==* ICOM U-400 16 Channel UHF 450-480 Mhz== FCC Rules: ==§ 95.1773 GMRS authorized bandwidths.Each GMRS transmitter type must be designedsuch that the occupied bandwidth does not exceedthe authorized bandwidth for the channels used.Operation of GMRS stations must also be incompliance with these requirements.(a ) Main channels. The authorized bandwidth is20 kHz for GMRS transmitters operating on any ofthe 462 MHz main channels (see § 95.1763(a )) orany of the 467 MHz main channels (see§ 95.1763(c )).(b ) Interstitial channels. The authorizedbandwidth is 20 kHz for GMRS transmittersoperating on any of the 462 MHz interstitialchannels (see § 95.1763(b )and is 12.5 kHz forGMRS transmitters operating on any of the467 MHz interstitial channels (see § 95.1763(d )).(c ) Digital data transmissions. Digital datatransmissions are limited to the 462 MHz mainchannels and interstitial channels in the 462 MHzand 467 MHz bands. § 95.1775 GMRS modulation requirements.Each GMRS transmitter type must be designed tosatisfy the modulation requirements in this section.Operation of GMRS stations must also be incompliance with these requirements.(a ) Main channels. The peak frequency deviationfor emissions to be transmitted on the mainchannels must not exceed ± 5 kHz.(b ) 462 MHz interstitial channels. The peakfrequency deviation for emissions to be transmittedon the 462 MHz interstitial channels must notexceed ± 5 kHz.(c ) 467 MHz interstitial channels. The peakfrequency deviation for emissions to be transmittedon the 467 MHz interstitial channels must notexceed ± 2.5 kHz, and the highest audio frequencycontributing substantially to modulation must notexceed 3.125 kHz.(d ) Overmodulation. Each GMRS transmittertype, except for a mobile station transmitter typewith a transmitter power output of 2.5 W or less,must automatically prevent a higher than normalaudio level from causing overmodulation.(e ) Audio filter. Each GMRS transmitter typemust include audio frequency low pass filtering,unless it complies with the applicable paragraphsof § 95.1779 (without filtering).(1) The filter must be between the modulationlimiter and the modulated stage of the transmitter.(2) At any frequency (f in kHz) between 3 and20 kHz, the filter must have an attenuation of atleast 60 log (f/3) dB more than the attenuation at1 kHz. Above 20 kHz, it must have an attenuationof at least 50 dB more than the attenuation at1 kHz.§ 95.1771 GMRS emission types.Each GMRS transmitter type must be designed to satisfy the emission capability rules in this section. Operation of GMRS stations must also be in compliance with these rules.(a) Each GMRS transmitter type must have the capability to transmit F3E or G3E emissions.(B) Only emission types A1D, F1D, G1D, H1D, J1D, R1D, A3E, F3E, G3E, H3E, J3E, R3E, F2D, and G2D are authorized for use in the GMRS.== bandwidth - wide or narrow ==The GMRS bandwidth divides into 22 channels that are common with FRS. Also, eight additional repeater channels are solely available to licensed GMRS operators.*Channel 1 @ 462.5625 MHz through Channel 7 @ 462.7125 MHz is 20kHz bandwidth*Channel 15 @ 462.5500 MHz through Channel 22 @ 462.7250 MHz is 20 kHz bandwidth*Channel 8 @ 467.5625 MHz through Channel 14 @ 467.7125 MHz is 12.5 kHz narrow-bandChannels 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