DMR: - Digital mobile radio
DMR is the new kid on the block . . . . and the reason that the normal analogue bands are less busy (appart from the internet that is)
en.wikipedia.org
Digital mobile radio (
DMR) is a limited open digital
mobile radio standard defined in the
European Telecommunications Standards Institute (ETSI) Standard TS 102 361 parts 1–4
[1] and used in commercial products around the world. DMR, along with
P25 phase II and
NXDN are the main competitor technologies in achieving 6.25 kHz equivalent bandwidth using the proprietary
AMBE+2 vocoder. DMR and P25 II both use two-slot
TDMA in a 12.5 kHz channel, while NXDN uses discrete 6.25 kHz channels using frequency division and
TETRA uses a four-slot TDMA in a 25 kHz channel.
DMR was designed with three tiers. DMR tiers I and II (conventional) were first published in 2005, and DMR III (Trunked version) was published in 2012, with manufacturers producing products within a few years of each publication.
The primary goal of the standard is to specify a digital system with low complexity, low cost and interoperability across brands, so radio communications purchasers are not locked into a proprietary solution. In practice, given the current limited scope of the DMR standard, many vendors have introduced proprietary features that make their product offerings non-interoperable with other brands.
There were various standards in the beginning from the big boys . .
These have now filtered down to the four main players. D-STAR, DMR, (will edit + +)
You can access the DMR world by connecting to a local repeater, or run your own "hotspot"
DMR differers from traditional analouge radio as not point to point.
the DMR system uses your radio to link to a "hotsot" - this is connected to the internet and routs the voice data over the globe to another "hotspot" then to a radio at the other end.
This means that the DMR system is truly global . . . and not geographically locked.
The user groups work like internet chat rooms. . . . . with one to many people chattinf.
The DRM system uses a gloabal databse for users and chatrooms that can be loaded into the radio in whats called a "code plug"
This is where i got to and hit a brick wall - - - - =[
To get access to the DMR world i need a UK callsign (licence) to apply for a DMR id (usermane) . . .
so for now im stuck . . .
This is what i have at the moment. . . . the new radio.
Anytone AT-D878UV PLUS DMR Dualband con Bluetooth PTT
Free delivery and returns on eligible orders. Buy Anytone AT-D878UV PLUS DMR Dualband con Bluetooth PTT at Amazon UK.
amzn.to
The Anytone AT-D878UV Plus Bluetooth has DMR Roaming, a faster processor and larger memory for future upgrades. Get your own at Moonraker now!
www.moonraker.eu
Anytone AT-D878UV PLUS BLUETOOTH Digital DMR Dual-band Handheld Commercial Radio with Roaming and GPS VHF/UHF Dual-band Digital/Analog Part 90 DMR commercial transceiver with 1.77 inch colour TFT display and GPS.
New AT-D878 model includes DMR Roaming, faster processor and larger memory for future enhancements. Ideal for Fire, Search & Rescue, EMS, Police, Sheriff, Forestry and Security operations. Frequency coverage 140-174 / 400-480 MHz.
Includes USB Programming cable.
- Roaming : Built-in DMR Repeater Roaming feature
- APRS / GPS Capable : DMR-APRS and Analog APRS Capable (GPS)
- VHF/UHF Dual Band : Monitor two bands at the same time (V+V, U+U & V+U)
- Digital DMR and Analog: Features both DMR digital and analog modes on any channel.
- High Power Output : 6.0W, 4.0W, 2.5W, 1.0W selectable TX power output
- 2 & 5 Tone Paging Includes built-in : 2 Tone and 5 Tone Paging feature
- Programming Cable : Includes USB Programming Cable, free software available for download.
- Color TFT Display :1.77 inch color TFT screen for Day or Night operation. User changeable display and font colors.
- Roaming : New Built-in Roaming Feature
- APRS (GPS): DMR-APRS and Analog APRS Capable (GPS)
- Processor :Faster Processor over the D868UV
- Additional Memory: Larger Memory for Future Enhancements TFT Display Background Display and Font Colors are User changeable
- Digital Monitor :Monitor One or Two Timeslots
- Zone Select :Selectable Zones from Keypad
- Auto RX Mode Receiver : Auto Selects to incoming Digital or Analog Signal
- GPS : Built-in GPS feature
- Memory Channels: 4,000 channels
- DMR Talk Groups : 10,000
- Digital Contacts: 150,000 (complete worldwide database from DMR-MARC)
- Power Levels : 4 programmable power levels: 6/4/2.5/1 Watt Transmit Power Levels.
- Zones : 250 zones, up to 250 channels per zone.
- Display: 1.77 inch color TFT Screen with selectable dual channel or single channel display.
- Battery: Operate 35+ hours between charges with the supplied 3100 mAh lithium ion battery in the power saver mode.
- Bandwidth : 12.5 / 25.0 kHz Analog, and 12.5 kHz DMR
- Import/Export :Enhanced CPS allows direct input and export of channels, digital IDs and talkgroups.
- DMR Compatibility: Supports both Tier I and Tier II operation, making it compatible with DMR repeaters that utilize two-slot TDMA technology.
- Amateur Radio: Also operational on amateur radio DMR networks and analog frequencies. Software importable worldwide amateur contact database.
- Programmable : FCC 47CFR90.203 requires the keypad locked in the shipping configuration. Software keypad unlocking and re-programming are available with the included USB Programming Cable.
- Speaker Connection :2-pin style Kenwood/Wouxun type earphone and speaker mic connection for a variety of accessories.
- Quiet Tones :CTCSS/DCS tone squelch with split tone and custom tone capability.
- Frequency Range : 140-174 / 400-480 MHz RX/TX
+++
this is my one . . .
im getting my own local hotspot too . . . so watch this space for that . . .
...
www.essexham.co.uk
I used to get up very early on Sundays to get some long range comms all over Europe... I also had a couple of digital scanners used to listen to planes and other service that used analogue simplex transmission.
