Pure DMR simplex doesn't require synchronisation as the timeslots are ignored. Dual Capacity Direct Mode and repeaters do, of course, require a timing sync signal from either a nominated timing leader or repeater. In both cases, lack of sync doesn't actually make things "fall apart", it's just impossible to gain access and you get the low beep of failure.
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General scanning discussion forum. Talk about anything to do with scanners, equipment, VHF/UHF reception and the art of catching those illusive signals!
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Thanks for that! I wondered how it all worked, I knew there was something to with timing but not sure what as I'm still new to it myself.
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- Joined: 31 Dec 2016, 13:33
hi andy,(i think that you was the you that posted the original post) i have read all off the posts , and although i don't quite know what type of noise you are refering to , there is a company called lh agro which transmit data on lots of freqencies including 449.450 and they have something to do with farm machinery tractor data ect and can wipe out some of the 449 mhz chanells the other one is 453.550 , which is a common railtrack frequency. if you look on the ofcom website you will find out which other frequencies are affected . i have one of these transmitters about 10 miles from me and it some of the 449.mhz chanells are unuseable