Sources[ edit ] Constantine was a ruler of major importance, and he has always been a controversial figure. These are abundant and detailed,  but they have been strongly influenced by the official propaganda of the period  and are often one-sided;  no contemporaneous histories or biographies dealing with his life and rule have survived.
TDF from Allouis, France, on kHz Radio-controlled clocks receive Bio 330 time calibration signals with built-in long-wave Bio 330. They use long-wave, rather than short-wave or medium-wavebecause long-wave signals from the transmitter to the receiver always travel along the same direct path across the surface of the Earthso the time delay correction for the signal travel time from the transmitting station to the receiver is always the same for any one receiving location.
Longwaves travel by groundwaves that hug the surface of the earth, unlike mediumwaves and shortwaves. These different propagation paths can make the time lag different for every signal received.
The delay between when the long-wave signal was sent from the transmitter when the coded time was correct and when the signal is received by the clock when the coded time is slightly late depends on the overland distance between the clock and the transmitter and the speed of light through the airwhich is also very nearly constant.
Since the time lag is essentially the same, a single constant shift forward from the time coded in the signal can compensate for all long-wave signals received at any one location from the same time signal station. Historic[ edit ] Swedish station SAQ, located at the Varberg Radio Station facility in Grimeton, is the last remaining operational Alexanderson alternator long-wave transmitter.
Although the station ended regular service init has been maintained as a World Heritage Siteand makes at least two demonstration transmissions yearly, on The long-wave broadcasters are located in western, northern, central, and southeastern Europe, the former Soviet UnionMongoliaAlgeriaand Morocco.
Typically, a larger geographic area can be covered by a long-wave broadcast transmitter compared to a medium-wave one. This is because ground-wave propagation suffers less attenuation due to limited ground conductivity at lower frequencies.
Droitwich also broadcasts a low bit-rate data channel, using narrow-shift phase-shift keying of the carrier, for Radio Teleswitch Services.
In and Russia closed all of its LW broadcast transmitters. DXers attempt to listen in to far away transmissions, and they will often send a reception report to the sending station to let them know where they were heard.
After receiving a report, the sending station may mail the listener a QSL card to acknowledge this reception.
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