449 UK simple irritating noise?

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JohnB57
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Re: 449 UK simple irritating noise?

Post by JohnB57 »

26mb04 wrote: 02 Dec 2019, 17:56 ...one of the drawbacks with DMR over dPMR is that DMR users MUST be synchronised with each other and the repeater (if used) or the whole thing falls apart.
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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Re: 449 UK simple irritating noise?

Post by 26mb04 »

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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Re: 449 UK simple irritating noise?

Post by warlock01 »

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
yagiman
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Re: 449 UK simple irritating noise?

Post by yagiman »

I thought d m r was all suppose to be analogoue
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Andy
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Re: 449 UK simple irritating noise?

Post by Andy »

Thanks for all the suggestions. It's DMR simplex by the sound of it. There seems to be more of it every day.
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yagiman
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Re: 449 UK simple irritating noise?

Post by yagiman »

Sorry I meant I thought all 449 channels had to be analogoue
Sorry my wrong word Andy
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Re: 449 UK simple irritating noise?

Post by scottyboy »

yagiman wrote: 29 Apr 2021, 02:08 Sorry I meant I thought all 449 channels had to be analogoue
Sorry my wrong word Andy

It seems more and more users are migrating to DMR so restricting the 449 and 458 MHz channels to analog only would just create a headache.
I believe as long as conforming to the license conditions then any mode of transmission is acceptable.
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yagiman
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Re: 449 UK simple irritating noise?

Post by yagiman »

That’s annoying
Mototrbo2020
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Re: 449 UK simple irritating noise?

Post by Mototrbo2020 »

The new Mitex DMR handies seem popular.
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Werthers
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Re: 449 UK simple irritating noise?

Post by Werthers »

Time for DMR scanners. I haven't seen any DMR scanners about but I'm sure it wont be long now.

There are a couple handheld DMR radios that offer a scan function which scan color codes, time slots, and talk groups when a DMR signal is found.
Mototrbo2020
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Re: 449 UK simple irritating noise?

Post by Mototrbo2020 »

Werthers wrote: 29 Apr 2021, 21:12 Time for DMR scanners. I haven't seen any DMR scanners about but I'm sure it wont be long now.

There are a couple handheld DMR radios that offer a scan function which scan color codes, time slots, and talk groups when a DMR signal is found.
Looking above £300 for a DMR scanner but they are out there and work.
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Re: 449 UK simple irritating noise?

Post by yagiman »

Is Whistler t r x 1 any good 😌
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Re: 449 UK simple irritating noise?

Post by deadite66 »

using a baofeng dm1801 with the recently deceased opengd77 firmware, using it to listen into DMR. you can disable cc and tg filtering.

it can't scan ranges but i usually find frequencies via SDR.
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Werthers
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Re: 449 UK simple irritating noise?

Post by Werthers »

deadite66 wrote: 30 Apr 2021, 15:02 using a baofeng dm1801 with the recently deceased opengd77 firmware, using it to listen into DMR. you can disable cc and tg filtering.

it can't scan ranges but i usually find frequencies via SDR.
Interesting :think:
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Re: 449 UK simple irritating noise?

Post by yagiman »

Is Whistler any good
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