Digital Voices

Digital Voices – The Formats Presently Being Used in Public Safety and Amateur Radio

APCO P25 Phase I is the present version that is in used across the country for Digital Public Safety, the P25 “open” standard has been reworked by some manufacturers limiting some of the standardization that the P25 was hoped to present..

P25 Phase I has the ability to function as a analog system or digital system.

P25 Presently operates via FDMA (Frequency Division Multiple Access) with the plan for P25 Phase II to use TDMA (Time Division Multiple Access), P25 Phase II will also have the capability to “roll-back” to FDMA for “conventional emergency operations.”


D-STAR is a Amateur Radio system which offers digital voice and data communication. It connects repeater sites over microwave links and the Internet and forms a wide area Amateur Radio network.

The D-STAR system provides a new capability and functionality to the Amateur Radio world and increases the efficiency of emergency communications.

D-STAR provides digital voice at 4k8 baud and data is available via 1.2GHz at a rate up to 128kbps via GMSK modulation – Gaussian Mask Shift Keying,

On VHF and UHF digital voice plus 950bps data can coexist on the same channel.

At the present time only Icom is making transceivers with D-STAR capability. With experimentation one can modify other transceivers for D-STAR Connectivity.

Fixed Base (i.e. repeaters) do not have analog capabilities – Strictly Digital Only.

Mobile/Porable D-STAR enabled equipment have both analog and digital capabilities.


MotoTRBO(tm) MotoTRBO is a product of Motorola with the primary market being Industrial-Business Sector. MotoTRBO is designed to operate digital only on a single 12.5kHz channel by slicing the digital transmissions into time slots thus creating to available channels via TDMA (Time Division Multiple Access).

Data throughput is 2k0 per time slot.

MotoTRBO has analog capability (repeaters can be programmed to operate analog or digital, mobiles and portables can operate analog and digital).


NXDN was designed by Icom and Kenwood primarily for the Industrial-Business Sector.

NXDN is marketed by Icom as IDAS (Icom Digital Advanced System) and Kenwood as NEXEDGE. With channels at true 6.25kHz channel spacing using FDMA (Frequency Division Multiple Access).

NXDN provides 9k6 @ 8.3kHz bandwidth and 4k8 @ 4kHz bandwidth.

NXDN is compatible with analog systems thus making migration from analog to digital easier. Some of the companies participating in NXDN equipment development include: Daniel Electronics, Icom, Kenwood and Ritron among others.

RepeaterGear.com

RepeaterGear.com professional quality gear for industrial, public safety and amateur radio. Custom built communication transportable systems, wireless networks including 4.9GHz, 900MHz NLOS, 2.4GHz, 5.8GHz as well as VHF, UHF and Satellite connectivity.

Communications … the act or process of communicating.

Experience within the Commercial Land Mobile Communications industry since 1980 along with experience in Amateur Radio operations since 1991. From our experience we continue to find that communications failure is one of the greatest problems facing any organization. With the multitude of different communications systems in use it is very difficult to get adequate information to those who need to have it. Solutions are available that can help your business in the utilization of these technology resources.

Computers … an electronic machine capable of accepting and processing data.

With over 20 years of technical knowledge, ResourceOne has the capability to provide technical support, service, training and solutions to special needs. Resources are available to assist with network applications, design of wire and wireless digital networks.

Networks … a group linked together.

Technology is advancing ever so quickly and the need for interoperability is ever increasing. Through networks the mission can be accomplished. From in-house local networks to global wide area networks that link voice and radio via the Internet.

ICOM FR5000 Series

Icom FR-5000/6000 Repeater

Double your channel capacity – IDAS doubles the capacity of the current 12.5kHz channel allocation. Icom allows you to meet any narrow banding requirements today, and provides a solution to any future spectrum deficiencies.

Digital/Analog mixed mode operation – The IC-FR5000 series can receive both analog and digital signals on a signal channel. You can partially introduce the IDAS system, while using the existing analog radios in a system. The IDAS system allows you to scale migration to narrow band digital at your own pace and need.

Network Interface (Option – Available in the future) – The IDAS repeater will have a network interface (option) and can be connected to a LAN or the Internet via Ethernet cable. Communication range is vastly extended by the Internet connection and eliminates the need for expensive leased lines. When connected to a PC via a LAN or the Internet, you can remotely maintain the repeater configuration remotely via your PC.

Digital Trunking capability is another future option that will be available.
MUCH MORE:

  • IDAS Digital / Analog FM
  • Two RF Modules in one unit (option)
  • 50 Watt RF Output 25 Watt Full Duty
  • 5-Tone, DTMF, CTCSS, DTCS
  • 2U height rackmount
  • 32 Channel memory, dot-matrix LCD Display

See more on the ICOM page.

ICOM FR5000 Series

Icom FR-5000/6000 Repeater

Double your channel capacity – IDAS doubles the capacity of the current 12.5kHz channel allocation. Icom allows you to meet any narrow banding requirements today, and provides a solution to any future spectrum deficiencies.

Digital/Analog mixed mode operation – The IC-FR5000 series can receive both analog and digital signals on a signal channel. You can partially introduce the IDAS system, while using the existing analog radios in a system. The IDAS system allows you to scale migration to narrow band digital at your own pace and need.

Network Interface (Option – Available in the future) – The IDAS repeater will have a network interface (option) and can be connected to a LAN or the Internet via Ethernet cable. Communication range is vastly extended by the Internet connection and eliminates the need for expensive leased lines. When connected to a PC via a LAN or the Internet, you can remotely maintain the repeater configuration remotely via your PC.

Digital Trunking capability is another future option that will be available.
MUCH MORE:

  • IDAS Digital / Analog FM
  • Two RF Modules in one unit (option)
  • 50 Watt RF Output 25 Watt Full Duty
  • 5-Tone, DTMF, CTCSS, DTCS
  • 2U height rackmount
  • 32 Channel memory, dot-matrix LCD Display

See more on the ICOM page.

RepeaterGear.net

RepeaterGear.net professional quality gear for industrial, public safety and amateur radio. Custom built communication transportable systems, wireless networks including 4.9GHz, 900MHz NLOS, 2.4GHz, 5.8GHz as well as VHF, UHF and Satellite connectivity.

Communications … the act or process of communicating.

Experience within the Commercial Land Mobile Communications industry since 1980 along with experience in Amateur Radio operations since 1991. From our experience we continue to find that communications failure is one of the greatest problems facing any organization. With the multitude of different communications systems in use it is very difficult to get adequate information to those who need to have it. Solutions are available that can help your business in the utilization of these technology resources.

Computers … an electronic machine capable of accepting and processing data.

With over 20 years of technical knowledge, ResourceOne has the capability to provide technical support, service, training and solutions to special needs. Resources are available to assist with network applications, design of wire and wireless digital networks.

Networks … a group linked together.

Technology is advancing ever so quickly and the need for interoperability is ever increasing. Through networks the mission can be accomplished. From in-house local networks to global wide area networks that link voice and radio via the Internet.

DICE

Digital Intertie Communication Enhancement (DICE) is mobile communications package designed for interoperability between analog and digital networks as well as diverse communications systems. DICE will fit in with the Communications Transportable System (CoTS) concept for Rapid Deployment Operations (RaDeO).

Forward-thinking Digital Imagining

1) HSMM capabilities at least in the 70cm band and even in 1.25m band.

2 ) Long range HSMM networks with data/video/voice capabilities. (With products like the Ubiquiti Networks Bullet[ubnt.com] should be able to get some decent range)

3) Low-cost Digital Interface that can plug into any radio with a data port (most new radios have a data port present, plus by regulation {at least for Part 90 equipment} they have to be able to handle at least 4k8 baud data – definitely not high speed, but it lets messaging take place).

4) Compact Rapid Deployment Links (RaDL) based on Asterisk that can be quickly delivered to any location thus providing phone and radio connectivity. ** Come up with a way to do it with the Gumstix Overo boards everything could fit in a radio. Add a Ethernet pigtail on the back of the radio one would have access to local SIP/IAX2 phone capabilities plus the radio could provide long-haul capabilities for at least one call to the outside world. Instant dispatch capabilities with the package too, along with intertie to other radio systems.**

The radio itself would work as a link/remote base anyone in the local network could connect through the LAN/wLAN to the RF side to transmit/receive via the radio itself. Plus they would still have local network capabilities. Since the original gumstix/Asterisk package was able to handle 10 to 15 calls, the new package should be able to increase that by at least (to 15 to 20 calls). Attach another wLAN to the RaDL would create another sub-network as well as capability for a second RF Gateway channel.