Motorola TETRA Takes off at Barcelona Airport

[N_Jay]

Originally Posted by Raccon

So what's a real-world practical figure that allows the radio to still reach the base station and allow the user to communicate properly (@ what base station power output, frequency, HAAT etc.)?

YES!

Your question is ridiculous.

It is like asking some one to tell you exactly what wattage light-bulb is needed to read the newspaper!

[ElroyJetson]

I'm not very familiar with Tetra (or MPT1327, for that matter) and would like to read a
primer covering these and other trunked systems which will allow me to understand how
they're different from other systems such as SmartNet or EDACS.


Does anyone know of such an article that they can point out for me?


Elroy

[N_Jay]

Originally Posted by ElroyJetson

I'm not very familiar with Tetra (or MPT1327, for that matter) and would like to read a
primer covering these and other trunked systems which will allow me to understand how
they're different from other systems such as SmartNet or EDACS.


Does anyone know of such an article that they can point out for me?


Elroy

http://www.google.com/search?hl=en&q=TETRA+radio

http://www.google.com/search?hl=en&q=MPT1327

[Raccon]

Originally Posted by N_Jay

YES!

Your question is ridiculous.

It is like asking some one to tell you exactly what wattage light-bulb is needed to read the newspaper!

Uh, I just wanted to ensure that I don't get smart-ass answers like "Until it is below the receiver threshold or background noise level" or "forever". So "allow the user to communicate properly" means that the radio receives a signal from the base station and can still reach the system and transmit the voice in an understandable manner (rather than hiss or constant drop-outs or whatever). Dunno how this is objectively measured or defined in P25, but let's just say that it has to be mostly error free.

The claim was made that P25 covers larger areas than TETRA, so obviously someone must know how far the signal can travel under the given conditions. Or was the statement incorrect?

[N_Jay]

Originally Posted by Raccon

Uh, I just wanted to ensure that I don't get smart-ass answers like "Until it is below the receiver threshold or background noise level" or "forever". So "allow the user to communicate properly" means that the radio receives a signal from the base station and can still reach the system and transmit the voice in an understandable manner (rather than hiss or constant drop-outs or whatever). Dunno how this is objectively measured or defined in P25, but let's just say that it has to be mostly error free.

The claim was made that P25 covers larger areas than TETRA, so obviously someone must know how far the signal can travel under the given conditions. Or was the statement incorrect?

Yes, P25 has a much larger "Link Budget" than TETRA, for lots of reasons.
Power, acceptable Carrier to Interference ratio, threshold sensitivity, and equipment power; all figure into the equations.

It is in dB and not miles, and even in dB it is not always the same.

Back to my lightbulb analogy.