band occupancy - PMR446 versus DMR 446

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bigbloke
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band occupancy - PMR446 versus DMR 446

Post by bigbloke » 24 Feb 2016, 11:44

Hi All,

From time to time (particularly if im working away for a few days) I like to set up some
analysis / logging tools and inspect different frequency bands looking for low usage services or...
shall we say...unpublished services that would not be picked up in a traditional memory scan.

Given the recent surge in commercial DMR usage, I wondered what the local uptake of DMR 446 was
like.

So I set up my systems and left them rolling for a few days. Below is the result, showing frequency (horizontal)
against strongest signal received (dBm)
pmr dmr 446.png
the "almost flat" results in 446.1 to 446.2 were where I ran the first pass with the squelch open to ensure the
logging was working! :-)

446.1625 is not DMR 446 traffic - its a local business in the Docks who have a legacy technically assigned analogue licence
within the DMR446 frequency range.

bearing in mind that from here I can get PMR 446 as far away as the avon and somerset coast and I overlook the
whole of cardiff and Newport city centres ....I think I can safely say Im "the only DMR446 user in the area !!"

regards

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Re: band occupancy - PMR446 versus DMR 446

Post by MrWeetabix » 24 Feb 2016, 12:43

Good data and an interesting result.... I suppose the majority of people are happy with 446's intended use, short range casual comms. No need for DMR
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Re: band occupancy - PMR446 versus DMR 446

Post by Admiral » 24 Feb 2016, 13:26

There may be more users when the Chinese suppliers realise that no one wants their dPMR sets and they start slashing them to thirty quid a set.
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Re: band occupancy - PMR446 versus DMR 446

Post by kr0ne » 24 Feb 2016, 14:12

A big part of it is also likely to be interoperability with existing equipment.

If you've already invested in analogue gear, you are unlikely to bin it right away. I'd guess that probably, as prices come down, business users will begin to buy digital capable devices but run them in analogue mode until such time that it makes sense to switch over fully.

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Re: band occupancy - PMR446 versus DMR 446

Post by bigbloke » 24 Feb 2016, 20:06

comparing the results of the rest of the comms spectrum audible from here between 136 and 470 MHz:

analogue NFM systems - 177
DMR systems - 109
TETRA systems (excluding Airwave) - 3
other DV modes (excluding ham) -2

so DMR is catching up VERY fast. a year ago the DMR figure was a mere 61 systems

Regards

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Re: band occupancy - PMR446 versus DMR 446

Post by Admiral » 24 Feb 2016, 21:02

Ah, I saw 446 and assumed dPMR, didn't twig you were referring to DMR as in Mototrbo.
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Re: band occupancy - PMR446 versus DMR 446

Post by stanogs68 » 24 Feb 2016, 21:38

I want one I think there great value for money
computers mess with my brain !

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Re: band occupancy - PMR446 versus DMR 446

Post by Panteneman » 28 Apr 2016, 16:15

bigbloke wrote: *snip*

Given the recent surge in commercial DMR usage, I wondered what the local uptake of DMR 446 was
like.
I assume you are using something like a Tytera MD-380 and programmed for the 8 channels above PMR446? If so, I've pondered doing that. As a 'proof of concept', I know a couple of people who did this as an experiment and worked well; they even tried basic encryption and full encryption too.

The next logical step with PMR446 being overcrowded (especially during civilised hourse) is people trying programming DMR radios for the purpose. As to my knowledge I don't think any actual DMR446 stuff per se exists.
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Re: band occupancy - PMR446 versus DMR 446

Post by radiosification » 28 Apr 2016, 19:03

Panteneman wrote:
bigbloke wrote: *snip*

Given the recent surge in commercial DMR usage, I wondered what the local uptake of DMR 446 was
like.
I assume you are using something like a Tytera MD-380 and programmed for the 8 channels above PMR446? If so, I've pondered doing that. As a 'proof of concept', I know a couple of people who did this as an experiment and worked well; they even tried basic encryption and full encryption too.

The next logical step with PMR446 being overcrowded (especially during civilised hourse) is people trying programming DMR radios for the purpose. As to my knowledge I don't think any actual DMR446 stuff per se exists.
Actually there is legitimate DMR446 equipment:
http://www.dmrtier1.com/en/
If you're interested in digital voice, check out my YouTube channel:
http://www.youtube.com/radiosification

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Re: band occupancy - PMR446 versus DMR 446

Post by bigbloke » 29 Apr 2016, 11:04

yes im running compliant radios from hytera

Regards

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