How many channels does a TETRA have?
32 channels
The TETRA standard provides 32 channels as against 16 or 8 of the GSM and traditional PMR technologies in the 200 kHz bandwidth.
What is TETRA communication?
TErrestrial Trunked RAdio (TETRA) is a digital trunked mobile radio standard developed to meet the needs of traditional Professional Mobile Radio (PMR) user organizations such as: Public Safety. Transportation. Utilities.
What frequency is TETRA?
Latest version of standard supports 115.2 kbit/s in 25 kHz or up to 691.2 kbit/s in an expanded 150 kHz channel.
How does a TETRA system work?
TETRA uses the TDMA (Time Division Multiple Access) channel access method, with four physical channels (time slots) or user connections on a single 25 kHz radio channel. If necessary for greater transmission capacity, an individual user can also occupy several (up to four) time slots.
What does TETRA stand for?
Definition of tetra- (Entry 2 of 2) 1 : four : having four : having four parts tetravalent. 2 : containing four atoms or groups (of a specified kind) tetrachloride.
What does TETRA mean in numbers?
| prefix | number indicated |
|---|---|
| tri- | 3 |
| tetra- | 4 |
| penta- | 5 |
| hexa- | 6 |
Is TETRA analog or digital?
DMR and TETRA are digital standards, and they provide some similar benefits to end users — encryption, which is more robust in TETRA; efficient data communications for GPS positioning, messaging and others; automatic handover and roaming; authentication; direct mode communications; and private and conference calls.
How do I listen to TETRA radio?
The easiest way to do this is to open SDR# or another program like GQRX and look for them. TETRA signals are continuously broadcasting with a bandwidth of around 25 kHz. In most European countries they can be found at 390 – 470 MHz. In some countries they may be found around 850 MHz or 915 – 933 MHz.
How much do neon tetras cost?
Neon Tetras are most likely to be sold at $1-$2 per fish.