![]() ![]() So the solution is: each Base station has a DTMF tone decoder that has a unique code to trigger it. So they need a way to filter out and be selective as to where they are talking and receiving. And then there's the delay caused by the phone or data circuits used to back haul the radio communications back to the dispatch center. And of course there could be trains switching or talking to MOW or detectors going off many receivers away and they would all add to the jumble of different audios. some receivers would just barely be hearing the intended signal and that poor noisey signal would cover up the excellent signal that the closest receiver is providing. Thus all those receivers couldn't all be active at the same time putting audio into his speaker or headset or all he would hear is mush. (they may need 20 different sites just to be able to talk to everywhere on their district) They don't normally listen to all the chatter that goes on and for good reason:ĭepending on the territory's size, and terrain (mountainous or flatland or both) they could have upwards of 10 to 20 different Base Stations with which to talk/listen to the trains. ![]() The three digit DTMF tones are in fact used to light a light and sound a tone in the dispatcher's pod at the Harriman Center (or BNSF's dispatch center in Tx) to let them know somebody needs to talk to them. Regarding the DTMF tones Heard on Tehachapi Feed
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