carrier power การใช้

• Reducing the carrier power results in greater transmitter efficiency.
• European standardization allows a maximum of 4 watts FM power or 1 watt AM carrier power.
• As a special case, the last second of every minute is marked with no carrier power reduction.
• When carrier power is too low, C / I is too low and QoS targets are not met.
• This carrier power reduction saves electricity.
• Maximum output power is 5 watts carrier power in AM mode and 12 watts PEP power in SSB mode.
• This was not possible for many years with positive modulation as the peak carrier power varied depending on picture content.
• Even ( analog ) television, with a ( largely ) suppressed lower sideband, includes sufficient carrier power for use of envelope detection.
• "That's the beauty of the flexibility of carrier power, " he said _ a capability particularly useful in the global war against terrorism.
• The power output from an FM transmitter is constant with modulation, so as power goes into the sidebands, the carrier power is reduced.
• The introduction of negative modulation in later systems simplified the problem because peak carrier power represented sync pulses ( which were always guaranteed to be present ).
• When carrier power is too high, excessive interference is created, degrading the C / I ratio for other traffic and reducing the traffic capacity of the radio subsystem.
• The ratio of power of the analog signal to the digital signal was initially standardized at 100 : 1 (  " 20 dBc ), making the digital signal 1 % of the analog carrier power.
• The maximum legal CB power output level in the U . S . is 4 watts for AM ( un-modulated carrier; modulation can be four times the carrier power, or 16 watts SSB, as measured at the transmitter antenna connection.
• DCC causes the carrier wave level to be automatically reduced when the silence ( no audio ), the carrier power is reduced by 50 %, so the 250 kW transmitter is putting out a carrier of 125 kW during audio pauses.
• The National Association of Broadcasters ( NAB ) requested a 10 dB ( 10?) increase in the digital signal from the FCC . This equates to an increase to 10 % of the analog carrier power, but no decrease in the analog signal.
• Another advantage of negative modulation is that, since the synchronizing pulses represent maximum carrier power, it is relatively easy to arrange the receiver automatic gain control to only operate during sync pulses and thus get a constant amplitude video signal to drive the rest of the TV set.
• The narrator contradicts most of the " facts " that the Japanese leader tells his listeners in Tokyo, Nagasaki and Otaru, and Kobe ( the height of the radio towers shown is assumed to be proportional to the respective station's carrier power : 500 kW for Tokyo; 50 kW for Nagasaki and Otaru; and 10 kW for Kobe ).