A、A.Less signal energy is necessary for receiver operation
B、B.More signal energy is available at the receiver
C、C.It significantly increases the peak power
D、D.It increases the signal capacity
更多“Loran-C uses the multiple pulse system because（）.”相关的问题
A、A.on loran charts covering areas where sky waves are used B、B.in the Radio Aids to Navigation，PUB 117 C、C.in the Loran-C Correction Tables D、D.Sky waves cannot be matched to ground waves in LORAN-C to produce a usable reading
A、High frequency pulses B、Combinations of high and low frequency pulses C、The same frequency for all stations in a chain D、Varied long and short pulses
A、only accurate during daylight hours B、much less accurate C、only accurate at twilight D、more accurate than using ground waves
A、Bell alarm to warn the user B、Lighted alarm signal to warn the user C、Alternate signal keying system D、View finder for each station
A、An atomic time standard B、Daylight Savings Time C、Eastern Standard Time D、Greenwich Mean Time
A、Reflected electron B、Electrical radiation C、Quarterpoint electrical navigation D、Hyperbolic radio navigation
A、every station in one chain to transmit at the same time B、each station to transmit without reference to another station C、on-line transmission of single-line transmitters at the same time D、each station to only depend on the master for synchronization and signal ratio
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