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Weird audio quality issue on one TG

madrabbitt

madrabbitt

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First a caveat: Not my system, not my problem. Just curiosity.

Local government system is a analog voice EDACS trunked, multi site system.

Lately, say 4-5 days, only on one specific talkgroup, all mobile/portable units have some severe modulation. Dispatch console still sounds clear as day.
It almost sounds to me like old school voice inversion scramble which was all the rage in the 80's and 90's on toy and consumer grade walkies.

Its not any type of modern encryption either, since i can understand a good majority of whats being said (Or is that just years of being a dispatcher giving me that superpower)

I'm going to try and capture an audio recording at some point, but that requires more effort then i have curiosity.
 
merlin

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That is definately a problem with the repeater. The dispatch console uses a different path than the uplink but why it is disciminating talkgroups,I dont know. can you monitor another site with that particular talkgroup ?
 
madrabbitt

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merlin said:
That is definately a problem with the repeater. The dispatch console uses a different path than the uplink but why it is disciminating talkgroups,I dont know. can you monitor another site with that particular talkgroup ?
Click to expand...
monitoring that talkgroup in the coverage area of all 3 sites on the system give me the same poor audio. Tried that last night when i was bored and couldnt sleep.

The audio issue is limited to that specific TG.

Also, as many years as i've been in radio/dispatch, it should have occurred to me the dispatch console is hard lined to the sites. Dont know why i didnt even think of that.

Also, same results on multiple scanners. The HP2 in the truck, the two base scanners at the house (which are only picking up one of the three sites)
 
KevinC

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Have you noticed if that TG is steered to the same channel? This could back up the "problem with the repeater" thought.

Not sure about EDACS, but in both 3600 and 9600 Motorola you can steer a TG to certain frequencies.
 
madrabbitt

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KevinC said:
Have you noticed if that TG is steered to the same channel? This could back up the "problem with the repeater" thought.
...
Click to expand...

I may have to sit in the truck and watch it. Good thing i have heated seats.
 
madrabbitt

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Well, i was going to say "nope, appears to be normal trunking operations"

And then i realized as i sat there watching it, its also not doing the weird distorted audio anymore. Guess I can unlock that channel in the feed again
 
madrabbitt

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madrabbitt said:
Well, i was going to say "nope, appears to be normal trunking operations"

And then i realized as i sat there watching it, its also not doing the weird distorted audio anymore. Guess I can unlock that channel in the feed again
Click to expand...
Wait no. When i got back in my office and unlocked them for the feed, i noticed SOME units are distorted still. Dispatch is clear, some units are clear.
Watching the frequency display to see if theres any common factors on the distorted ones.
 
S

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It almost sounds like they may have built a rudimentary patch (ie. back to back radios) and have this patched to another system? I would watch the radio IDs that come up when they talk. If the distorted radios all come up with the same radio ID number, this might be what is going on.
 
madrabbitt

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Since its not my system and not my problem, i've put as much brain energy into this as i wanted, however, my observations:

Dispatch is always clear (as explained above why)
Units on the site closest to the town this TG is for are always distorted
Units roaming on one of the two other sites are clear (occasionally a unit comes to the larger city, and when they're here, i can hear them clearly, even if they were distorted on the home site)
Only affects this specific talkgroup.
Doesnt seem to be a problem for the units in the field or the dispatcher hearing each other well.

-When i sit in the area of their home site and lock on that TG on the truck's scanner:
Dispatch is still clear, units are still distorted
The TG is hopping frequencies on the trunk as normal
Individual unit ID's are broadcasting normally as expected (so its not related to a single subscriber)

-From my office (which is closest to the big city primary site and not in range of this TG's home site):
The TG is behaving correctly
Individual subscriber id's are popping up correctly
Same clear audio on dispatch and distorted on mobile units, except when one unit came to the city, i heard them clearly when they were here.
 
madrabbitt

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I'm going to BTT this, because that community had a shooting, and theres a ton of traffic on the feed from this talkgroup right now.
 
madrabbitt

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Oh and how's this for weird.

I heard an officer talking while responding to the call, and while his voice seemed extremely distorted, the siren in the background was extremely clear and not distorted.
 
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