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Digital Voice Formats Discussions regarding different digital radio voice formats, including AMBE, IMBE, VSELP, GSM, CELP, MELP, and others.

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Old 10-11-2013, 8:02 PM
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Default New Transmission Type?

I apologize if this is not the proper forum for this.

Our fair started last week and last year I found their frequencies that were in the clear. This year the transmissions seem to be using something to mask their transmissions. It's nothing I've heard before. I've posted a recording here: https://docs.google.com/file/d/0B-6q...it?usp=sharing

It's an mp3 that you have to download to listen. If anyone can recognize this 'sound' I would appreciate it.

Jason
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Old 10-11-2013, 11:27 PM
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It's digital. Sounds sort of like NXDN, but I could be wrong. Likely rental radios they are using, or they just upgraded since last year.

If it is NXDN, the only way to decode it is using an external connection to a computer.

Last edited by mmckenna; 10-11-2013 at 11:34 PM..
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Old 10-11-2013, 11:47 PM
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Quote:
Originally Posted by mmckenna View Post
It's digital. Sounds sort of like NXDN, but I could be wrong. Likely rental radios they are using, or they just upgraded since last year.

If it is NXDN, the only way to decode it is using an external connection to a computer.
That doesn't sound like any NXDN/IDAS that I have ever heard.... not be a longshot. Seems to me that it's more like an analog signal with some type of digital scrambling on it.

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Old 10-12-2013, 8:26 AM
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It is some type of TDMA format. Maybe the input to a TRBO repeater.
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Old 10-12-2013, 9:44 AM
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could be a gps telemetry for the locos what freq did you hear it on ?
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Old 10-12-2013, 3:32 PM
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Too many file requests have been made, it is not available at this time. I guess I will have to try later.
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Old 10-13-2013, 11:09 AM
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Quote:
Originally Posted by mtindor View Post
That doesn't sound like any NXDN/IDAS that I have ever heard.... not be a longshot. Seems to me that it's more like an analog signal with some type of digital scrambling on it.

mike
That's what it sounds like to me. They are using the same frequencies as last year so I'm not sure they rentals.

The freqs are 453.9875, 456.1875, 458.6625, 459.2250

Someone suggested it could be simplex mototrbo.
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Old 10-13-2013, 11:32 AM
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Default New Transmission Type?

It's TRBO simplex.
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Old 10-14-2013, 8:10 AM
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I concur, sounds like TRBO simplex, which if I understand won't be decoded by
DSD as it does not handle simplex or repeater input format.

Dave
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Old 10-14-2013, 8:17 AM
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DSD 1.6 (Windows) decodes simplex TRBO fine. I've done it with my radios here.
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Old 10-14-2013, 5:43 PM
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Thanks everyone for the help. I was in the Fair office today and saw their base station which is a Motorola and above that was a list of the different channels they use (I presume each frequency is a channel).

Jason
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Old 10-16-2013, 6:47 PM
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Oh totally DMR.
On simplex, it'll have that sputtering motorboat sound.
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