channel) that does not exceed 30 watts for transmitters operating on channels 14-69 and 3 watts for transmitters operating on channels 2-13, and must have a transmitter that contains circuits which will maintain the digital average power output constant within 1 dB when the strength of the input signal is varied over a range of 30 dB. 47 C.F.R. § 74.795 Digital heterodyne translators mix the incoming frequencies of the input signal with frequencies generated by a tuned local oscillator to generate an IF frequency (such as 44 MHz) that is passed through a band pass filter and upconverted by the same process to the final RF output channel for amplification. Modification of Digital Transmission Systems and Analog Transmission Systems for
and TV translator stations authorized to operate on TV channels 22-24, (518-536 MHz), 32-36 (578-608 MHz), 38 (614-620 MHz), and 65-69 (776-806 MHz) must provide specific ``out of band'' protection to Radio Navigation Satellite Services in the bands: L5 (1164-1215 MHz); L2 (1215-1240 MHz) and L1 (1559-1610 MHz).'' * * * * * 5. Paragraph 25 of Appendix B, § 74.795(b)(4), should read as follows: ``(4) When subjected to variations in ambient temperature between 0 and 40 degrees Centigrade and variations in power main voltage between 85% and 115% of the rated power supply voltage, the frequency stability of the local oscillator in the RF channel upconverter shall be maintained within 10 kHz of the nominal value.'' * * * *
manner that will prevent the harmonic emission content from reaching the antenna. A description of the low pass filter or equivalent device with the manufacturer's rating or a report of measurements by a qualified individual shall be retained with the station license. Field measurements of the second or third harmonic output of a transmitter so equipped are not required. Section 74.795 is added to read as follows: § 74.795 - Digital low power TV and TV translator transmission system facilities. (a) A digital low power TV or TV translator station shall operate with a transmitter that is either certificated for licensing based on the following provisions or has been modified for digital operation pursuant to § 74.796 of this part. (b)