What Trunking and Digital Systems sound like on analog scanners

[mkewman]

Could someone post a couple wav files of what the control channels of EDACS and LTR sound like and also digital control channels? I know what MOT sounds like, but i'd like to be able to identify using my ears if thats possible.

would that be possible?

thanks

 

[bassmkenk2508]

Check out this website.
http://www.kb9ukd.com/digital/
Has tons of stuff! It is really interesting... I came across sounds I have randomly heard on my scanner on that site

But since the page is quite filled with numerous files, here are
EDACS - 9600 baud,
EDACS - 4800 baud, Narrowband

LTR is different though.
Here is a link on LTR: LTR - RRWiki
Each repeater in the system sends out data bursts or "chirps" to all of the radios using the system. Not a continuous data stream as Motorola and EDACS. The bursts are typically heard every ten seconds.

 

[lowboy654]

thanks for the cool links very helpful

 

[BirkenVogt]

Our LTR system is set to not send the bursts and I suspect many others don't either. It sounds like regular analog radio because that's what it is. You do not normally hear the control information at all. There is no control channel on an LTR system.

One thing that might clue you into an LTR system is that if a user on his home channel gets trunked away because somebody else is using the home channel at the same time and then that other user stops transmitting but the first guy is still on the trunked away channel, the home channel will transmit what sounds like a dead carrier, but it is really the LTR data which you can't hear, telling those users what the other channel the system has sent them too.

Birken

 

[grem467]

i have never heard of an LTR system that does not send the data bursts.

are you listening to the system on a commercial radio programmed on the system, or a scanner?

 

[SCPD]

i have never heard of an LTR system that does not send the data bursts.

LTR can send idle bursts. However, the data is always sub-audible - much like a CTCSS or PL tone. Unless someone is talking, you won't hear anything. The "chuff" sound you hear is the squelch tail at the end of each idle burst.

 

[BirkenVogt]

are you listening to the system on a commercial radio programmed on the system, or a scanner?

I program the system. It is my system. I have the option to turn the bursts on, or not.

I use only Kenwood TK-780s and 7180s, so far. There is apparently no reason to turn the bursts on with these radios so they are not turned on.

The main reason, though, is when I set the system up I had the stack of 3 radios, amps, etc. all paralleled off one 30A power supply in the shop for testing. When all 3 radios would key up at the same time it would collapse the power supply so I turned it off and have not turned it back on since.

Birken