Tones?

[INDY72]

Again-
On a scanner with tone capability.. if you set the tone on a freq... you will only hear the agency using that one... whether its CTCSS or CDCSS
Buy a scanner and try it..
You will be surprised...

The PRO-92 in closed mode with tones set will only break squelch when that tone is recieveed....

I am not going to get into a catfight with you.. that is just not worth it...

Tones on Professional radios prevent you from hearing the interference from other users on the same freq, and are a control feature used to prevent interference from being passed , and controlling who accesses the radio system. You seem to like to argue this... If you are using a radio and it is set for a certian tone... It will NOT break squelch on just any transmission.... Only upon transmission of the same tones. Why the systems I monitor seem to not interfere is a mystery to me.. I state actual facts as they are happening.... You can argue all day....

This was also covered in trunking under single freq trunking.... And something called a community repeater was mentioned.. that allowed multiple users with multiple tones to access the single repeater and NOT interfere with the other users.....

Seems that someopne needs to chill.. but its not my place to say it .. so I will go on.

 

[loumaag]

The PRO-92 in closed mode with tones set will only break squelch when that tone is recieveed....

Almost. It also has to be scanning. PL/DPL does not work on the Pro-92/2067 in manual or program modes, only Closed Mode Scanning.

 

[INDY72]

Yes.. and thus one scanner was set up to scan certian tones, the other with other tones in closed mode and scanning... I use this a lot to verify various usage on systems. I own only one 92 B right now but I have a friend that has one, and has a 2067, and well he has a lot of fun "toys" dealing with radios.....

He also has an Motorola HT that I am going to trade with him soon... his is VHF, mine is 800... He needs an 800, and I need another VHF... Not to mention he has all the RSS, RIB's PC set up for programming.... Just wish I could get him to jump on this site.. but he has some issues reqarding the net.. lol.. (everyone has some kind of phobia)

 

[nmfire10]

What the hell are you talking about? You are so out there in the stratosphere on this, it is almost sad. What you've just said is so ludicrous, I am actually laughing at it. People like you are what make the so-called "scanning community" look like fools to the rest of the professional and public safety communications community. I'm not even going to waste my time explaining why what you've just said is so stupid, it would only be a re-wording of what I and others have already said. I've said it clearly and nicely up to this point. Now you're pushing it. If you can't figure it out from all of that, then nothing else will help anyway. Do yourself and others a favor, stop now while you aren't too far behind. :roll:

By the way, you should come up with a better defense than "you need to chill out". That seems to be the response whenever I tell someone they are wrong and use things like "fact" and "logic" to do it. You obviously haven't seen me when I actually need to chill out if you think this is me going off the wall. :roll:

 

[n4voxgill]

Milf, your missing the point. when you program for a tone, once the tone is received it opens up the receiver to everything that is on the frequenccy.

 

[Voyager]

And something called a community repeater was mentioned.. that allowed multiple users with multiple tones to access the single repeater and NOT interfere with the other users.....

Actually, they do not HEAR each other. If they both try to talk at the same time, they most certainly will interfere with each other. Community repeaters (single repeater - single site - one - uno - same repeater) CANNOT be used at the SAME time by more than one user without using CDMA or TDMA technology (which is not compatible with CTCSS/CDCSS).

CTCSS/CDCSS DOES NOT eliminate interference - only only keeps users from hearing interference or other users and will not open the RX until a signal with the tone/code is received. If someone else keys up, and they are as strong or stronger than the signal you want to receive, you WILL NOT receive the weaker signal - period. The tone/code will be lost, and the receiver will mute.

This applies to ONE RX - no multiple RXs with yagi antennas - no wireline links with RXs in separate geographical areas - no radio links with the same, etc.

Joe M.

 

[ILbandit]

I think I got it now. It's basicaly a way for several different groups to use the same freq., only their radios are set up to only recieve the transmissions preceded by their individual tone.

Above is my main question, I have an understanding of how the radios work now.
Remeber,,,, I am just getting started, so all the tech. stuff is flying right over my head.

Thanks for all the info, Didn't mean to cause such a uproar. :?

 

[Voyager]

I think I got it now. It's basicaly a way for several different groups to use the same freq., only their radios are set up to only recieve the transmissions preceded by their individual tone.

Above is my main question, I have an understanding of how the radios work now.
Remeber,,,, I am just getting started, so all the tech. stuff is flying right over my head.

Thanks for all the info, Didn't mean to cause such a uproar. :?

Actually, ' preceded ' is not correct. The tone/code is transmitted for the entire transmission (minus a short period at the end where the STE is - that's Squelch Tail Elimination).

Joe M.

 

[ILbandit]

OK, I thought it just had a burst at the beginning. Thanks for the correction.
I'll eventually get this stuff figured out.

 

[nexus]

yeah like a lot of other people on here said...

The tones keep your radio SILENT until another radio transmits with the exact tone.

There are thousands of public safety agencies and not much radio spectrum for them all. It's not uncommon to find say two police departments using the same frequency even though they might be several cities or counties or even a state or two away, and on ocasion will interfere with one another due to weather conditions. Since they can't just pick an choose their frequncies, they can however pick and choose their CTCSS or motorola trademark name PL tone. Another one is called DCS or motorola trademark name DPL.

Both CTCSS and DCS are subaudible. Meaning you won't hear the tone. But it's being transmitted the entire time a radio is keyed up. Once the radio unkeys and the transmission stops, your radio goes back to silent. Even though there could be other users within range (if they aren't sending the same tone)

Just keep in mind that you won't hear the tones.. and it sends it at the same time as the station is transmitting. It isn't required to have the tones entered in to hear the agency or users, BUT it sure does help if you want to filter out any unwanted signals from other agencies which might come in due to weather conditions, or other interference.