47 CFR § 95.1779 - GMRS unwanted emissions limits.
(a)Emission masks.Emission masks applicable to transmitting equipment in the GMRS are defined by the requirements in the following table. The numbers in the attenuation requirements column refer to rule paragraph numbers under paragraph (b) of this section.
|Emission types filter||Attenuation
|A1D, A3E, F1D, G1D, F2D, F3E, G3E with audio filter||(1), (2), (7)|
|A1D, A3E, F1D, G1D, F3E, G3E without audio filter||(3), (4), (7)|
|H1D, J1D, R1D, H3E, J3E, R2E||(5), (6), (7)|
(4) 116 log (fd ÷ 6.1) dB or 50 + 10 log (P) dB, whichever is the lesser attenuation, on any frequency removed from the center of the authorized bandwidth by a displacement frequency (fd in kHz), of more than 10 kHz up to and including 250% of the authorized bandwidth.
(c)Measurement bandwidths. The power of unwanted emissions in the frequency bands specified in paragraphs (b)(1) through (4) of this section is measured with a reference bandwidth of 300 Hz. The power of unwanted emissions in the frequency range specified in paragraph (b)(5) of this section is measured with a reference bandwidth of at least 30 kHz.
(d)Measurement conditions. The requirements in this section apply to each GMRS transmitter type both with and without the connection of permitted attachments, such as an external speaker, microphone, power cord and/or antenna.