systems include existing facilities and additional facilities which may be authorized as a clear and direct expansion of existing facilities. After December 31, 1999, all signaling systems shall be required to comply with the 2 second message duration and 3 message repetition requirements. * * * * * (l) Secondary fixed signaling operations conducted in accordance with the provisions of §§90.317(a) or 90.637 are exempt from the foregoing provisions of this section. * * * * * 18. Section 90.237 is amended by revising paragraphs (a) and (g) to read as follows: § 90.237 Interim provisions for operation of radioteleprinter and radiofacsimile devices. (a) Information must be submitted with an application to establish that the minimum separation between a proposed radioteleprinter
systems include existing facilities and additional facilities which may be authorized as a clear and direct expansion of existing facilities. After December 31, 1999, all signaling systems shall be required to comply with the 2 second message duration and 3 message repetition requirements. * * * * * (l) Secondary fixed signaling operations conducted in accordance with the provisions of §§90.317(a) or 90.637 are exempt from the foregoing provisions of this section. * * * * * 18. Section 90.237 is amended by revising paragraphs (a) and (g) to read as follows: § 90.237 Interim provisions for operation of radioteleprinter and radiofacsimile devices. (a) Information must be submitted with an application to establish that the minimum separation between a proposed radioteleprinter