EDACS Provoice garbling

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dstew67

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Has anyone else noticed an occasional garbling sound? It seems to be sporadic, with a slight-to-moderate garbling of voice transmissions. It doesn't seem to affect dispatchers any more or less than other individual users.

It sounds like a bandwidth issue...
 

dstew67

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Digital transmissions are actually data. If there is not enough bandwidth, some of the data is lost along the way, leaving a garbled-sounding, and sometimes a broken, transmission.

This is similar to pixilating that you see in some satellite transmissions on television. If the satellite is not aimed correctly, the bandwidth is reduced.

Of course, this is just an educated guess...it could be something else
 

MMIC

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Inside of the circuit....
There is plenty of bandwidth available in a 12.5 kHz RF channel to carry the voice data. There is probably some sort of RF interference issue you are seeing. It could really be anything from time differential interference (TDI) to Nextel.
 

dstew67

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The question was if anyone else had noticed. Bandwidth was just my offering of what it sounded like.

I suppose it really doesn't matter what the cause is, as long as it's going to get fixed.

Back to the question, has anyone else noticed?
 

Thayne

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I don't know about your location, but it sounds typical of any digital system at times, not just ProVoice.
 

freqscout

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It was happening alot last night. It was kinda bad for a while. It was also reminiscent of low/loss of signal where there are massive packet losses to the point of completely degrading the voice.

We were joking around about it because someone got on the air and said it sounded like the dispatcher was "talking in hieroglyphics".
 
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dstew67

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Interesting....Wil Rogers dispatcher just said one M/A-Com tech is there, and another is on the way to determine the cause of the garbling....that tech told the dispatcher that he was not hearing anything wrong on his handheld while he was on the way in.

I guess someone else did hear what I was hearing.

Thayne, I agree...has nothing to do with the system being Provoice...has everything to do with the system being digital. It is exactly what you might hear on your cell phone, for example, when the signal is less-than-optimum. The difference in this case is that it has been happening with a regularity last night and today that we haven't heard before.

A low signal reduces bandwidth, but RF saturation seems not to be an issue at all. I haven't heard anyone complain that they have experienced any low spots. The only issue I still hear about with regularity is where there is sometimes no audio when someone transmits. That still seams to be happening. You'll see the radio ID on the display, see the BSY light, but won't hear audio. The next time that user transmits, you hear them just fine. At least on the surface, there doesn't seem to be any rhyme or reason for that issue.
 

dstew67

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freqscout said:
We were joking around about it because someone got on the air and said it sounded like the dispatcher was "talking in hieroglyphics".

Isn't that a second language for some dispatchers? :wink:
 

Dispatch6

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d_stew said:
Isn't that a second language for some dispatchers? :wink:


Oh real funny!

We notice the garbling but it just adds to all the other issues...and we just used to it all.
 
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