16 new channels for digital.

Licence free two-way radio services that now includes both FM and digital channels. Discuss models, modifications and other similar worldwide standards such as FRS and GMRS.
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ryan_paul
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16 new channels for digital.

Post by ryan_paul » 13 Feb 2006, 16:29

Dear All

I read in Monitoring monthly that there is to be another 16 channels in the PMR446 allocation.

The new channels are for data traffic and are between 446.100 and 446.400 MHz (I think) 12.5 KHz apart and 6.25 KHz offset.

This will include
- Digital voice
- Email and SMS
- Other types of RF digital that I cannot remember.

Anyone heard any more details?

Cheers.

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Post by Guzzy » 13 Feb 2006, 20:23

Here's a section from a document I saw regarding this:
The success of PMR 446 analogue radio is obvious as it corresponds to user needs for short-range communications in peer-to-peer mode. Digital PMR 446 applications are specifically targeted at the small-scale PMR systems in all areas. Digital PMR 446 applications should be interpreted in this ECC Decision as referring to equipment satisfying the spectrum management considerations and market-sector requirements addressed by this Decision.

The transition to digital technology in all sectors of radio communications is vital in order to meet the user expectations whilst improving spectrum efficiency. To date, this market sector of low cost digital PMR handheld equipment has not been addressed. Digital PMR 446 applications will be crucial to the future of the low-end mobile radio market. Digital PMR 446 applications typically have a simplified functionality that should be treated in a similar manner as the analogue PMR 446 equivalent with a limited set of channels and a specification that allows usage to be exempted from individual licensing (or covered by a general authorization to use the equipment).

Industry research has indicated that provision of a small number of key features would increase the value that the users can derive from the equipment, and a significant increase in demand could therefore be expected.

Some of these key features are:
1.Improved audio quality.
2.Improved battery performance.
3.Improved quality of service extending out to the range limit (rather than greater absolute range).
4.Data communication, typically short message.

Finally, it is important that the corresponding frequencies are harmonised throughout Europe. A pan-European harmonised frequency designation would give the economy of scale required to produce terminals at a price that can compete with analogue technology and further encourage users towards early adoption.


The frequency band 446.0-446.1 MHz has been designated for PMR 446 by CEPT/ERC Decision (98)25 of 23 November 1998. PMR 446 is intended for short range voice communications based on analogue 12.5 kHz systems. CEPT/ERC Decisions (98)26 and (98)27 provide provisions on "Exemption from individual licensing" and "Free circulation and use" of PMR 446 equipment.

License exempt digital PMR 446 applications within the band 446.1-446.2 MHz are envisaged as complementing the current analogue PMR 446 applications by providing additional features. The handheld terminals with integral antennas are suitable for simplex, digital peer-to-peer voice and data communications with low bit rates. Initially two variants for low cost handheld digital PMR 446 equipment with integral antenna are under consideration in order to provide solutions optimised for business and consumer user market segments. These are both FDMA systems using either a 12.5 kHz bandwidth according to ETSI TR 102 335‑1 V1.1.2 (2004-10), or using 6.25 kHz bandwidth according to ETSI TR 102 433. In the future there may possibly be other systems covering digital PMR 446 applications.

ETSI has already developed the harmonised European standards EN 300 113‑2 (12.5 kHz bandwidth) and EN 301 166‑2 (6.25 kHz bandwidth) for radio conformance purposes.

The spectrum within 446-446.2 MHz is considered sufficient for low cost, short range communications. Other parts of the radio spectrum in the VHF and UHF ranges are used for the professional market offering repeater mode or trunked mode. The spectrum 446.1 - 446.2 MHz is currently used for licensed systems in some countries and these licences will continue to be valid for several years. Hence digital PMR 446 users have to accept interferences in those areas where incumbent systems are still used.

This ECC Decision describes the spectrum management requirements of, and intends to provide for exemption from individual licensing and free carriage and use for digital PMR 446 applications.
This quote is from a European radio frequency policy document entitled:
  • ELECTRONIC COMMUNICATIONS COMMITTEE
    ECC Decision of 28 October 2005 on harmonised frequencies, technical characteristics, exemption from individual licensing and free carriage and use of digital PMR 446 applications operating in the frequency band 446.1- 446.2 MHz

    (ECC/DEC/(05)12)
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Re: 16 new channels for digital.

Post by rattledrat » 13 Feb 2006, 21:22

ryan_paul wrote:Dear All

I read in Monitoring monthly that there is to be another 16 channels in the PMR446 allocation.

The new channels are for data traffic and are between 446.100 and 446.400 MHz (I think) 12.5 KHz apart and 6.25 KHz offset.

This will include
- Digital voice
- Email and SMS
- Other types of RF digital that I cannot remember.

Anyone heard any more details?

Cheers.

Them PMR446 are great for mod to 70cm ham band and connecting to a Linear Amp with a 4CX500 PA tube. Even a 4CX250 will do for QRP :)

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Re: 16 new channels for digital.

Post by Guzzy » 13 Feb 2006, 23:21

rattledrat wrote:
Them PMR446 are great for mod to 70cm ham band and connecting to a Linear Amp with a 4CX500 PA tube. Even a 4CX250 will do for QRP :)
Erm... modifiying a PMR446 radio to operate on the 70cm ham band in digital mode doesn't seem like a particularly good investment to me.

Why would you bother?
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Re: 16 new channels for digital.

Post by rattledrat » 14 Feb 2006, 20:36

2H2UZ wrote:Erm... modifiying a PMR446 radio to operate on the 70cm ham band in digital mode doesn't seem like a particularly good investment to me.

Why would I waste my money buying a digital PMR446 when I have the capability here to add digital modes to transmitters using a Laptop :)
I would mod a PMR446 to another frequency to make it more usefull
just like mod CBs to 10Mtr or 6Mtr band.

Why would you bother?
Why look a gift horse in the mouth. :)

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Post by Guzzy » 14 Feb 2006, 22:10

The PMR radio would hardly be pocket portable, with a laptop attached to it!

These new digital modes are all about adding text messaging, and data modes to portable devices ( like you have on your mobile phone).

But, I guess if you have a use in mind. Why not.
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Post by rattledrat » 15 Feb 2006, 20:28

2H2UZ wrote:The PMR radio would hardly be pocket portable, with a laptop attached to it!
That depends on how big you' pockets be. :)
These new digital modes are all about adding text messaging, and data modes to portable devices ( like you have on your mobile phone).
Old hat Jon, been about for years, their just letting the public loose with it now. While I type this my Transceiver is sending & receiving DRM data, makes a change from fast scan TV or MT63
But, I guess if you have a use in mind. Why not.
Well you just guess right. Yes mod to 70cm, like I wrote earlier.

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