§ 80.255 - Technical requirements for reserve transmitter.

Link to an amendment published at 68 FR 46966, Aug. 7, 2003.

(a) The following table describes the operating carrier frequency, emission, modulation and average ship station antenna power requirements for the reserve transmitter.

Operating frequency (kHz)Frequency toleranceParts 1 in 10 6Hz 2Class of emissionPercentage modulation for amplitude modulationModulation for frequency for amplitude modulationPower into an average ship station antenna5003 1,00020A2A and A2B or H2A and H2BNot less than 70; not more 100At least 1 frequency between 300 and 1250 Hertz except for transmitters installed after July 1, 1951, at least 1 frequency between 450 and 1250 HertzNot less than 25 watts.410 and 1 working frequency in the band 415 to 5253 1,00020A2A and A3N or H2A and H3N......do......do......do1 For equipment approved before November 30, 1977.2 For equipment approved after November 29, 1977.3 Except for reserve transmitters whose use is confined solely to safety communications. Such transmitters must maintain a frequency tolerance of 3000 parts in 10.6

(b) A reserve transmitter must operate at its required antenna power when adjusted to the operating frequency and energized by the reserve power supply of the ship station or by an equivalent power supply.

(c) A reserve transmitter must be equipped to measure antenna current.

(d) The antenna power must be determined at the operating carrier frequency by the product of the antenna resistance and the square of the average antenna current both measured at the same point in the antenna circuit at approximately gound potential.

Effective Date Note:

At 68 FR 46966, Aug. 7, 2003, § 80.255 was removed effective October 6, 2003.