OK I basically understand the ProVoice types of EDACS systems, but would like a simple (if there is one) explanation of how opensky works, and if there is a single scanner that could monitor it?
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OpenSky???
- Thread starter INDY72
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N_Jay
Guest
milf said:
2 or 4 slot TDMA 800 MHz about 9600 BPS per slot.
Each slot will carry data or voice, the voice is trunked much like iDEN or TETRA private and group calls.
To the best of my knowlege no scanners receive it.
So OpenSky is P-25 Compliant?
GlacierClipper
Member
OpenSky is a digital radio system sold by M/A-COM. It uses a two-slot TDMA transmission method in 25 kHz bandwidth with an aggregate data rate of 19.2 kbps. The airlink protocols are based on modified CDPD.
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N_Jay
Guest
milf said:
No, it is not P25 Phase one and at this time is not one of the P25 Phase two proposals.
Thanks guys. I am a long time Motorola fan, and have been trying to find out about the other flavors recently. Mainly learning about LTR stuff in hopes that one day there will be a scanner made that can trunk track Passport stuff, but trying to comprehend how all of them work, especially digital stuff since the wave of digital rolls on.
PJH
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ProVoice (the digital audio end of OpenSky as I understand it) is IMBE, however, MA/COM has is modified slightly which makes in unusable with all the other IMBE radio's out there. Same with thing with OpenSky.
Just when you come of with a standard, someone else has to buck the system!
Just when you come of with a standard, someone else has to buck the system!
With the new emphasis on interoperability that the 9/11 hearings and the entire 9/11 eppisode has highlighted, one ponders if Ma-Com/Tyco will be pressured to get on the train and make a interoperable P-25 digital system that would work with Motorola, and with E.F.Johnson P-25 systems? Anyway my next question is about the ability of Motorola 9600 P-25 systems: Can a radio user on one of these systems communicate to a 3600 system if it needs to without dropping to a conventional freq?
PanJurekMrJerry
Member
:arrow: Good point!!!! Now what about the other way around from 3600 to 9600? Can users from 3600 systems communicate with
users from 9600 systems?
users from 9600 systems?
PJH
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Yes, if they have the P25 option in their radio and the other system is setup on it.
For instance, a Motorola radio with just Smartzone in it, cannot talk to a P25 Smartzone system. If they radio has the P25 option in it, it can talk to other P25 systems (if they are setup in the radio) and any other Motorola based trunking system (Smartzone, Type II etc).
For the most part, you can go down, but not up.
For instance, a Motorola radio with just Smartzone in it, cannot talk to a P25 Smartzone system. If they radio has the P25 option in it, it can talk to other P25 systems (if they are setup in the radio) and any other Motorola based trunking system (Smartzone, Type II etc).
For the most part, you can go down, but not up.
"ProVoice (the digital audio end of OpenSky as I understand it) "
ProVoice and OpenSky are _completely_ unrelated. ProVoice is digital EDACS.
- Rob
ProVoice and OpenSky are _completely_ unrelated. ProVoice is digital EDACS.
- Rob
ProVoice is EDACS IMBE digital, and as I now know OpenSky is TDMA digital and niether are APCO-P-25 caompatable, and no scanner will doi iether. I am learning, scary aint it.
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N_Jay
Guest
PJH said:
Yes and no!
Just because two systems use the smae family of vocoder, or the same family of channel access, does not make them simlar.
There are many other factors.
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N_Jay
Guest
PJH said:
Yes I know.
The issues is when complex things are oversimplefied, people end up believing that they understand things they don't! :twisted:
Maybe its the who world, or maybe its just this board, but people here lik eto use one defining factor per system.
i.e. It is a 3600 BPS system or a 9600 BPS system, or it is IMBE, or it is TDMA.
We end up in discussions that don't make much more sense than "Which is a better a blue car or a dark truck?"
The idea is to start off simple then progress technically to each level of understanding. If you just start the usual insults that apply to the ones that are trying to learn and are not super techie whizzes that get paid to do this stuff on a daily basis, then you get the cat and dog show your reffering to. How does a person learn? By levels, this is true no matter what medium. You crawl, then stand, then totter, then walk, then run, then if your gifted with the things you learn, you drive! Were you born an expert at any radio systems? No you learned the skills you have. Now lets not get a fight going and keep trying to help each other.
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N_Jay
Guest
milf said:
I guess it comes down to the old saying "There are no stupid questions."
But some here love to provide stupid (word used for poetic symetry) answers.
PanJurekMrJerry
Member
Do any radio systems use C.D.M.A. or F.D.M.A.?
FDMA
Hello
APCO25 is a FDMA type system as is Tetrapol and MPT1327 so yes. CDMA is used by mobile phone companies around the world using the new UMTS standard and it is used by some US mobile phone companies using an older system.
Regards
Ian
Hello
JerryNone said:
APCO25 is a FDMA type system as is Tetrapol and MPT1327 so yes. CDMA is used by mobile phone companies around the world using the new UMTS standard and it is used by some US mobile phone companies using an older system.
Regards
Ian
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