DMR distances

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DMR distances

Postby mickydt » Wed Jan 16, 2019 10:47 am

i all ways presumed that dmr only could cover shortish distances but was picking one station up with what sounded like Liverpool accent and this morning i confirmed that they are based somewhere around the Liverpool area just goes to show.

just wondering if people on here have picked up good dmr distance transmissions.
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Re: DMR distances

Postby CW-2E0UCW » Wed Jan 16, 2019 8:55 pm

It all depends on the transmit power, height of the antenna and terrain.

I can get into a DMR repeater on a handheld from 11 miles away however I battle with a repeater 2 miles away due to buildings.
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Re: DMR distances

Postby JohnUK » Wed Jan 16, 2019 9:19 pm

mickydt wrote:picking one station up with what sounded like Liverpool accent and this morning i confirmed that they are based somewhere around the Liverpool area just goes to show.


Was it 152.1125 by any chance?
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Re: DMR distances

Postby Metradio » Wed Jan 16, 2019 9:56 pm

Sometimes things are not as they appear, DMR signals travel the same distance as FM ones do, BUT sometimes DMR repeaters are linked together using the internet or whatever, allowing the reception of users of distant repeater on one local to you..
On amateur DMR repeaters you can hear users from all over the world..

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Re: DMR distances

Postby mickydt » Thu Jan 17, 2019 10:22 am

no it is in the 166mhz band i remember years ago 166mhz band around here was used for ambulances along with portables in the 450mhz bands.

i never really thought about the possibility of it going through a repeater setup which could explain the situation.

as for that 152 frequency i will pop that in and see if i get any hits i haven't done any searches in that band for ages.

all the best for now.
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Re: DMR distances

Postby jimh » Thu Jan 17, 2019 9:05 pm

A [legal] transmission in the 166Mhz band will almost always be via a repeater: the input should normally be +4.8Mhz in the 171Mhz range.

The 450Mhz ambulance link you heard was a slightly different thing: The Control to Ambulance link will have been via Repeater (or simply a base transmit) on 166Mhz, and input from Ambulance to Control (via repeater/hilltop base) in the 171MHz range. The Ambulances also carried short range UHF repeaters and the crew UHF handies - the Ambulance repeated the VHF link onto UHF and onto the handies, and the crews could talk back on the VHF link via the UHF handie. 453MHz and 459Mhz if memory serves me correctly.
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Re: DMR distances

Postby Metradio » Thu Jan 17, 2019 9:38 pm

The vehicle repeater could be run UHF/UHF as well, giving crews extended range to each other on scene..
The VHF/UHF repeater was useful during meal breaks, allowing crews more options on where to eat but still be in contact with control if required, otherwise we were tied to somewhere with telephone contact.

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Re: DMR distances

Postby jimh » Thu Jan 17, 2019 10:30 pm

Thanks Mike....good to know :thumbup:
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Re: DMR distances

Postby CW-2E0UCW » Fri Jan 18, 2019 10:17 pm

JohnUK wrote:
mickydt wrote:picking one station up with what sounded like Liverpool accent and this morning i confirmed that they are based somewhere around the Liverpool area just goes to show.


Was it 152.1125 by any chance?


The nearest hit on that frequency is for DCS 2 Way Radio Limited (L5 3QC) - https://www.dcs2way.co.uk/
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Re: DMR distances

Postby G4RMT » Sat Jan 19, 2019 10:44 pm

I'm intrigued with this notion that DMR doesn't go as far. In the commercial sector the main selling point is that digital stays good out to the fringes, when it suddenly just dies, rather than becoming broken up. That to me is more usable range. Digital audio has always like this - it works wonderfully until it doesn't.
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