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Digital Talkgroups

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emsguy

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I've been monitoring a local Motorola trunking system. I have noticed that the Fire and EMS talkgroups are 3 and 4 digits and are analog. The digital talkgroups for the police are 5 digits and are encrypted. Is there any rule of thumb that says when analog talkgroup id's turn into digital?
 

WayneH

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With Motorola you segregate analog and digital talkgroups into TG number ranges. The default seems to be the standard 8 block ranging like 001h to 1FEh, 200h to 3FEh (TT format being 16 to 8160, 8208 to 12256, etc). Admins have the flexibility to specify any ranges but not many are that trunking guru-ish to go out of the norm.

So what you are seeing is common but it's not related to number of digits.

-Wayne
 

FPO703

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I've heard of some systems with analog & digital TGs intermixed within a range. Also, seen some where one side is analog and the other side is digital.

Now, how realistic that is, I don't know. But..........
 

WayneH

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FPO703 said:
I've heard of some systems with analog & digital TGs intermixed within a range. Also, seen some where one side is analog and the other side is digital.

Now, how realistic that is, I don't know. But..........
Right, I sure won't believe the analog and digital on the same talkgroup. It just doesn't work that way. The intermixing is possible, but not very logical. Depends on systems needs if they didn't plan out their talkgroup map well enough.

-Wayne
 

PJH

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Digital and analog cannot be on the talkgroup. Any talkgroup in any mode (analog/digital/encypted) can be placed anywhere.

Most systems are setup in groups. Be it analog 1-50, digital 50-100...fire 1-50, public works 50-100...whatever. It just helps with table making, programming setup's, etc. Just makes life easier.
 

INDY72

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Correct, a TG can not be analog, and digital at the same time. But ANY TG, be it analog, or digital can be encrypted at any time if the radios on that TG are set up for encryption.
 

WayneH

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milf said:
But ANY TG, be it analog, or digital can be encrypted at any time if the radios on that TG are set up for encryption.
Yeah, interesting thing, with some of the 6809 systems you can use the system illegally running encryption and no one will ever know what's going on unless you have watchful admins. The system has to already be set up for encryption though and most cases it'll be for 12kbit. The radios will ignore the call; if they are enc enabled they'll jump to the VC, then jump back since the key will be wrong.

No one go out and do that though! :roll::lol: SmartZone systems it's a bit more difficult as you have to do a bit more probing to figure what's enabled or disabled.

The systems never care about the key, all they care is the CT is correct, the RID is good, and the TG is enabled.

-Wayne
 
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