Tetrapol

Tetrapol

Frequencies	370 MHz,400 MHz
Frequency Range	370 MHz - 400 MHz
Mode	NFM
Modulation	GMSK
ACF	20 ms
Emission Designator	—
Bandwidth	12.5 kHz,10 kHz
Location	Europe
Short Description	Tetrapol is a digital professional mobile radio standard for digital voice and data communication used by public safety and military throughout Europe. Tetrapol was originally developed by Matra Communication (Currently part of EADS/Airbus Group) in France in the 1980's.
I/Q Raw Recording	Download file
Audio Sample

Tetrapol is a digital professional mobile radio standard for digital voice and data communication used by public safety and military throughout Europe. Tetrapol was originally developed by Matra Communication (Currently part of EADS/Airbus Group) in France in the 1980s. At the time, the system was known as "Matracom 9600".

The first Tetrapol customers were the Gendarmerie (mid-1992) and the police (early 1995) in France. Today, Tetrapol technology is supported and is being further developed by two organisations: the Tetrapol Forum (predominantly manufacturers) and the Tetrapol User's Club (user organisations). Tetrapol is not to be confused with the similar sounding TETRA system.

Characteristics

Tetrapol uses a documented data format with undocumented voice codec and optional undocumented encryption algorithms. Tetrapol is FDMAFrequency Division Multiple Access with a channel width of 10 kHzKiloHertz (kHz) 10^3 Hz or 12.5 kHzKiloHertz (kHz) 10^3 Hz.

Tetrapol runs at 8000 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. with an ACFAutoCorrelation Function of 20.069 msmilliseconds (.001 of a second). The raw data rate is 8000 bpsBits per second (bps).

Samples

Idling with Traffic	Trunking Control Channel

Additional Samples

Digital Voice Traffic:

Idling:

Frequencies

380-383, 390-393

370-400 MHzMegaHertz (MHz) 10^6 Hz. Usually more channels in a group together.

Video Examples

• Tetrapol & Tetra
• Jobporträt IT-Feldwebel Tetrapol
• Převodník Hytera - Tetrapol

Decoding Software

Hobby Level Software

• brmlab Tetrapol Kit
• brmlab Tetrapol Audio (only unencrypted and requires tetrapol hardware)

Professional Software

• go2DECODE
• go2MONITOR

Additional Links

• Tetrapol Forum
• Tetra Watch: Tetrapol and TETRA: a briefing
• shoc Database: Tetrapol
• Tetrapol factsheet
• RadioScanner.RU Tetrapol
• Wikipedia Tetrapol
• Switzerland Federal Office of Communications: Tetrapol Factsheet
• RadioScanner.RU GMSK Analysis

Additional Images

Tetrapol GMSKGaussian Minimum-Shift Keying Phase Analysis