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Talk:FRS/GMRS

2,880 bytes added, 28 February
/* FCC Rules: */ new section
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== 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.
Bureaucrat, administrator
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