§ 80.873   VHF radiotelephone transmitter.

   (a) The transmitter must be capable of transmission of G3E emission on
   156.300 MHz and 156.800 MHz, and on frequencies which have been
   specified for use in a system established to promote safety of
   navigation. Vessels in waters of other Administrations are required to
   communicate on any channel designated by that Administration for
   navigational safety in the bands specified in § 80.871(d).

   (b) The transmitter must be adjusted so that the transmission of speech
   normally produces peak modulation within the limits of 75 percent and
   100 percent.

   (c) The transmitter must deliver a carrier power between 8 and 25 watts
   into a 50 ohm effective resistance. Provision must be made for reducing
   the carrier power to a value between 0.1 and 1.0 watts.

   (d) The transmitter complies with the power output requirements
   specified in paragraph (c) of this section when:

   (1) The transmitter is capable of being adjusted for efficient use with
   an actual ship station transmitting antenna meeting the requirements of
   § 80.876; and

   (2) The transmitter has been demonstrated capable, with normal
   operating voltages applied, of delivering not less than 8 watts of
   carrier power into 50 ohms effective resistance over the frequency band
   specified in § 80.871(d). An individual demonstration of the power
   output capability of the transmitter, with the radiotelephone
   installation normally installed on board ship, may be required; and

   (3) It is certificated as required by subpart F of this part.

   [ 51 FR 31213 , Sept. 2, 1986, as amended at  63 FR 36607 , July 7, 1998]

   return arrow Back to Top