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How do 2 people talk (same time) on a trunked system??

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Desert-Rat

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I apologize if this question has been asked before. . .

On Car 54, Where Are You?, an old TV program, they used to say "Car 19, go to Channel 2". But on trunked frequencies, there is no "channel two". Channel 2 could be any of a number of frequencies. Does this mean that there has to be non-trunked frequencies so, for instance, two police officers could talk privately in addition to the transmissions going on on the trunked frequencies??

Thanks in advance, for replies. I've learned a lot using this web site!

Dave Benner
 

KCChiefs9690

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Usually there is just a "Secondary Talkgroup" to accomplish this. Units on the main talkgroup would just drop down to the secondary talkgroup when needed.

Other places (like my area), DO use conventional frequencies as secondaries to the main trunking talkgroup. There is no "better" way to do it, it's just how the agency wants to do it. ;)
 

fmon

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To add to Colin's note, Trunked systems use a control freq (CC) to match an available voice freq (VC) with a tactical (Tac) or talk around talkgroup (TG). Many agencies (PD, Fire, EMS, Garbage, PW, and Schools) can share these few frequencies by using several talkgroups for each agency.

The CC matches the TG on push to talk (PTT).
 

richster

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Also users of a given TRS will talk privately with each other as "individuals".

Example would be lets say two users of that TRS had something pesonal to convey to each other and didn't want any body else to hear. Obviously they wouldn't go to the secondary talkgroup because as a "group" anyone else privy to that TG can hear.

The two radio users can contact each other one-on-one away from any TG and prying ears. When an "individual" user of the TRS hits the PTT, their message doesn't transmit on a given TG, but rather directly to the individual Radio-ID (AKA other person) specified by the one who is sending the message.

Back in '99 when I bought my first trunktracker that was able to follow EDACS systems, I was perplexed to find traffic on the TRS that I couldn't hear when in trunking mode, but I could hear them when scanning the system conventionally. That's because the users were not talking on a "talkgroup" but rather privately as "individuals".

That was my 245XLT, but todays Uniden scanners are able to track "individual" users as well.

I'm willing to bet if you hear private conversations when scanning the system conventionally, most likely they are talking in "individual mode".

Regards,
Richster.
 

n4voxgill

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most police departments on trunked systems have one or more car-to-car talkgroups that are used for this purpose. Fire departments frequently have TAC talk groups for communications between radios at a fire scene. All of these are done within the trunked radio system.
 

richster

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Hi Dave,

I looked through you're other posts and found that you are running a BCT8. I looked through the manual on that radio and it appears the BCT8 cannot track "individual" users of a TRS (trunked radio system). :(

It will do LTR systems though.

Regards,
Richster.
 

Desert-Rat

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One Main Talk Group?

KCChiefs9690 said:
Usually there is just a "Secondary Talkgroup" to accomplish this. Units on the main talkgroup would just drop down to the secondary talkgroup when needed.

Other places (like my area), DO use conventional frequencies as secondaries to the main trunking talkgroup. There is no "better" way to do it, it's just how the agency wants to do it. ;)

- - - - Colin, could the "main talk group" be only one talk group, leaving three others for the "secondary one"?? I have found four talk groups.

Thanks for the quick response!

Dave Benner
 

kikito

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Desert-Rat said:
On Car 54, Where Are You?, an old TV program, they used to say "Car 19, go to Channel 2". But on trunked frequencies, there is no "channel two". Channel 2 could be any of a number of frequencies. Does this mean that there has to be non-trunked frequencies so, for instance, two police officers could talk privately in addition to the transmissions going on on the trunked frequencies??
To put it simply and not going into detailed and complicated explanations, they can do exactly the same nowadays with trunked systems.

When they say "Go to Channel 2", they'll be most likely going to a different talkgroup. No need to worry about the particular frequencies, just let the trunked system take care of that. Channels are just that, channels. Regardless of them being a particular frequency or a particular talkgroup.

The same applies to "I-Calls" or "Private Calls".
 
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car2back

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richster said:
...I looked through you're other posts and found that you are running a BCT8. I looked through the manual on that radio and it appears the BCT8 cannot track "individual" users of a TRS (trunked radio system)...
What scanner on the market can track individual radios on a TRS? :confused:
 

richster

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wayne_h said:
Folks we have a sticky at the top of this forum.

:sigh: ;)

-Wayne
Hi Wayne,

I found that the Wiki has next to no information on I-calls. I even did a seach on "I-call" and nothing comes up unfortunatley, including which radios are capable of tracking them.

Phil, there is a great web page where you can evalute and compare all sorts of scanners, including finding out which ones are capable of tracking I-calls.

http://myweb.cableone.net/marksscanners/Comparison/comparison.html

Regards,
Richster.
 
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