Enhanced Digital Access Communications System (EDACS)

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Enhanced Digital Access Communications System (EDACS)
EDACS96 Waterfallthmb.png
Frequencies 160 MHzMegaHertz (MHz) 10^6 Hz160,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
160,000 kHzKiloHertz (kHz) 10^3 Hz
,450 MHzMegaHertz (MHz) 10^6 Hz450,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
450,000 kHzKiloHertz (kHz) 10^3 Hz
,700 MHzMegaHertz (MHz) 10^6 Hz700,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
700,000 kHzKiloHertz (kHz) 10^3 Hz
,806 MHzMegaHertz (MHz) 10^6 Hz806,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
806,000 kHzKiloHertz (kHz) 10^3 Hz
,870 MHzMegaHertz (MHz) 10^6 Hz870,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
870,000 kHzKiloHertz (kHz) 10^3 Hz
,896 MHzMegaHertz (MHz) 10^6 Hz896,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
896,000 kHzKiloHertz (kHz) 10^3 Hz
,941 MHzMegaHertz (MHz) 10^6 Hz941,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
941,000 kHzKiloHertz (kHz) 10^3 Hz
160,000 kHzKiloHertz (kHz) 10^3 Hz
160 MHzMegaHertz (MHz) 10^6 Hz
941,000 kHzKiloHertz (kHz) 10^3 Hz
941 MHzMegaHertz (MHz) 10^6 Hz
Frequency Range 160 MHzMegaHertz (MHz) 10^6 Hz160,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
160,000 kHzKiloHertz (kHz) 10^3 Hz
- 941 MHzMegaHertz (MHz) 10^6 Hz941,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
941,000 kHzKiloHertz (kHz) 10^3 Hz
Mode NFMNarrowband Frequency Modulation
Modulation GFSKGaussian Frequency-Shift Keying
ACF edacs48: 60 msmilliseconds (.001 of a second) . edacs96: 30 msmilliseconds (.001 of a second)
Bandwidth 12.5 kHzKiloHertz (kHz) 10^3 Hz12,500 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
0.0125 MHzMegaHertz (MHz) 10^6 Hz
,25 kHzKiloHertz (kHz) 10^3 Hz25,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
0.025 MHzMegaHertz (MHz) 10^6 Hz
12.5 kHzKiloHertz (kHz) 10^3 Hz
0.0125 MHzMegaHertz (MHz) 10^6 Hz
25 kHzKiloHertz (kHz) 10^3 Hz
0.025 MHzMegaHertz (MHz) 10^6 Hz
Location United States
Short Description EDACS is a trunked radio system developed by General Electric and Ericsson. EDACS was invented by General Electric in the mid-80s and is currently owned by Harris Corporation. Harris has announced that EDACS systems will no longer be supported by 2017.
I/Q Raw Recording
Audio Sample
EDACS is a trunked radio system developed by General Electric and Ericsson. EDACS was invented by General Electric in the mid-80s and then further engineered by Ericsson and is currently owned by Harris Corporation. Harris has announced that EDACS systems will no longer be supported by 2017, urging customers to switch to newer P25 systems.

EDACS is primarily seen with it's trunking channels; the voice can either be analog FMFrequency Modulation or digitally encoded with AEGIS or ProVoice. AEGIS was the original format, but was soon replaced by ProVoice.

EDACS has three modes, Wideband, Narrowband, and Encrypted. Wideband EDACS is the most common form of this channel, and uses a 25kHz wide 9.6kbit/s trunking channel, where Narrowband EDACS uses 12.5 kHzKiloHertz (kHz) 10^3 Hz 4.8kbit/s trunking. The Encrypted version of EDACS (called EDACS Security Key (ESK), M/A-COM's trademark name for this feature) is a variant of the Wideband EDACS format, using specially coded frames that require a specific security key for two EDACS radios to communicate.

Transmitted using GFSKGaussian Frequency-Shift Keying digital modulation over working channels at either 4.8kbit/s or 9.6kbit/s. EDACS is a type of ESMR (Enhanced Specialized Mobile Radio) network.


Samples[edit]

EDACS 4800 EDACS 9600 EDACS Fire Disp. Callguard
EDACS48.jpg
EDACS96.jpg

EDACSfirecallguard.jpg

Frequencies[edit]

Frequency bands: 160 MHzMegaHertz (MHz) 10^6 Hz, 450 MHzMegaHertz (MHz) 10^6 Hz, 700 MHzMegaHertz (MHz) 10^6 Hz, 806 MHzMegaHertz (MHz) 10^6 Hz-870 MHzMegaHertz (MHz) 10^6 Hz, 896 MHzMegaHertz (MHz) 10^6 Hz-941 MHzMegaHertz (MHz) 10^6 Hz

Decoding Software[edit]

Hobby Level Software

Decoding Tutorials[edit]

Additional Links[edit]

Additional Images[edit]