Brock213 said:
Thanks my friend. When I am on
http://www.radioreference.com/modules.php?name=RR&sid=604 - I see more Talkgroups than frequencies. Are all of those Talkgroup ID's, covered by the handful of frenquencies, that are listed on that page?
YES.
Or does every Talkgroup ID, have it's own frequency?
NO
Brock213 said:
Thanks my friend. When I am on
http://www.radioreference.com/modules.php?name=RR&sid=604 - I see more Talkgroups than frequencies. Are all of those Talkgroup ID's, covered by the handful of frenquencies, that are listed on that page? Or does every Talkgroup ID, have it's own frequency?
Talk Groups are not related to frequencies. A TG is an identifier assigned to an agency.
Apparently you do not understand how trunking works. Please read the following I wrote to explain it. Although written specifically for the PRO-95 it explains trunking in general.
How a Motorola trunking system works:
The object of trunking is to allow many users to share a relatively few frequencies.
A trunking system is controlled by a computer. Information is sent and received from the radios on a control channel, sometimes called a data channel. It sounds like a strong buzz.
A large system can have up to 28 freqs., 4 of which may be used as control channels. The control channel may be changed once a day or as often as the programmer decides. Although the PRO-95 needs only the control channels to track the entire system, it is best to put in all the freqs. in case they change the CC some day.
Each group of users (Fire, Police, etc.) is assigned TALK GROUPS. In a Motorola Type II system, the most common type, TGs are usually in 32 number steps starting with 16 and going up to 65536; 16, 48, 80 --- 4656, 4688, 4720 --- 28944, 28976, etc.
The system radios can have more than 100 TGs programmed into them.
When a mic is keyed, data is sent to the computer. The computer chooses an unused freq. and sends that data to all the radios using the TG of the originating unit. This all happens in a fraction of a second and it happens EVERY time a mic is keyed.
EXAMPLE:
Fire Dispatch calling Engine 4 (TG 4528 on 856.7125)
Engine 4 answering Dispatch (TG 4528 on 867.2625)
Respond to 73 Elm Street (TG 4528 on 866.9625)
Engine 4 responding to 73 Elm Street (TG 4528 on 858.4375)
If you have entered TG 4528 into your PRO-95, it will decode the control channel data and change your scanner freqs. to follow the conversation on TG 4528.
The PRO-95 has trunking 2 modes, OPEN and CLOSED.
OPEN (shows a + sign under the bank number) Receives all active TGs using the system.
CLOSED (shows a - sign under the bank number) Receives only the TGs YOU have put in to the scanner.
This should get you started, but you should read the manual carefully. You may need to read it several times.
NOTE: Uniden scanners, such as your BC895 use the terms SEARCH and SCAN instead of OPEN and CLOSED.
Dick
