TRX-2: Mototrbo reception issue.

[KF0SKV]

I got a puzzler here. I have 3 industries in my town programmed into my TRX-2. They are all Mototrbo systems. My first 2 come through very clear, both single channel systems, 4-5 bars of signal strength.

I have 1 industry on 5 channels, not a trunked system, good signal strengths, 4-5 bars but every time I hear a transmission, it sounds like harsh "whispering" or someone gasping for air. Am I missing a step somewhere? Any ideas???

 

[KevinC]

I got a puzzler here. I have 3 industries in my town programmed into my TRX-2. They are all Mototrbo systems. My first 2 come through very clear, both single channel systems, 4-5 bars of signal strength.

I have 1 industry on 5 channels, not a trunked system, good signal strengths, 4-5 bars but every time I hear a transmission, it sounds like harsh "whispering" or someone gasping for air. Am I missing a step somewhere? Any ideas???

Encrypted?

 

[KF0SKV]

Encrypted?

No, not encrypted. Doesn't trigger the encryption alert on my scanner.

 

[KevinC]

No, not encrypted. Doesn't trigger the encryption alert on my scanner.

Ok. Mine sounds the exact same way when "basic" encrypted is used as it doesn't always detect it's encrypted.

 

[KF0SKV]

Ok. Mine sounds the exact same way when "basic" encrypted is used as it doesn't always detect it's encrypted.

Well crap....maybe the system I want to listen to is encrypted.....

 

[sibbley]

it sounds like harsh "whispering" or someone gasping for air. Am I missing a step somewhere? Any ideas???

Sounds like Voice Inversion. That won't show as "encrypted".

 

[KevinC]

Sounds like Voice Inversion. That won't show as "encrypted".

Voice inversion on DMR??? Hmm...

 

[sibbley]

Voice inversion on DMR??? Hmm...

I believe the basic encryption on DMR radios sounds like voice inversion.

 

[StoliRaz]

The power of inversion! Just ask Roger Teeter 😂

Just wondering, what is this this that you're listening to that's encrypted?

 

[KF0SKV]

Nucor Steel

 

[Wackyracer]

Back in the day I bought a gadget to cope with voice inversion...I wonder if it would work in this instance?

 

[Whiskey3JMC]

Back in the day I bought a gadget to cope with voice inversion...I wonder if it would work in this instance?

Specifics on said "gadget"?

 

[CycleSycho]

Back in the day I bought a gadget to cope with voice inversion...I wonder if it would work in this instance?

Was it something like putting on headphones upside down and reversed? LOL


.

 

[amcferrin90]

Voice inversion on DMR=negative unless they managed to buy some vocoder option board that is compatible with their radios.
Encrypted DMR (called enhanced privacy on Motorola radios) on a scanner or decoder sounds like broken scrambled audio. You'll hear garbage with occasional muting and every once in awhile will sound like a blurb of speech inversion. The scanner will not show encrypted.

Each brand of radio has their own way of doing "encryption". My Moto 7550's sound like what I said above. My Baofeng DM-1701's sound like the unintelligible speaking portion of the Tasmanian Devil with no muting or any thought of intelligibility. The Motos use an 8-digit hex code. The BF uses a 32-digit hex code. So I'm sure neither will talk to each other when encrypted.

It seems like our out of luck.

 

[Wackyracer]

Specifics on said "gadget"?

it is in storage, but basically it takes the audio out of the earphone or speaker jack then it inverts it and outputs it to headphones etc.

 

[racingfan360]

Post a recording here for the audio and we'll be able to better advise. Even better if you use the duscriminator i/f option on the trx to record raw audio. If it's moto basic privacy its relatively easy to recover.

 

[merlin]

Is RAS possible ?

 

[KF0SKV]

Voice inversion on DMR=negative unless they managed to buy some vocoder option board that is compatible with their radios.
Encrypted DMR (called enhanced privacy on Motorola radios) on a scanner or decoder sounds like broken scrambled audio. You'll hear garbage with occasional muting and every once in awhile will sound like a blurb of speech inversion. The scanner will not show encrypted.

That description of the audio pretty much sums up what is being heard. I could not get a audio clip loaded into my laptop and post for review as I just purchased this TRX-2 and still learning on how it works. I will post the audio once I get that part figured out!

Far cry from my Pro106, besides the Object Oriented Scanning.

 

[racingfan360]

I've never heard of voice invesrion (an analog scambling method) used on DMR. RAS wont affect the audio, and not in the way you describe. Basic Privacy or Enhanced Privacy are most common. From what's been described BP is most likely. The raw audio will reveal more.

 

[KF0SKV]

Here is the audio......