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MotoTrbo novice questions

merlin

Active Member
Joined
Jul 3, 2003
Messages
3,102
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DN32su
I have been trying to monitor a site and a particular talkgroup using DSD+. Biggest fail is 75% of what should be voice is not decoded.
A notion I have is how much issue would be involved, programming up an XPR6550, just for one talkgroup (maybe two)
and where to start. Can most of the settings be left in default ? (Save for some obvious). I am guessing what few RIDs would be placed in contacts.
This site is a 3 repeater, (6 channel) CAP+. do those 6 channels go into the channel pool?
TNX for any input.
 

redbeard

OH, PA, WV Regional Admin
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If DSD+ isn't decoding it, you have a terrible signal or aren't using DSD properly. You should probably sort that out first to find out whether the system is using RAS or not. If they are you won't be monitoring with your XPR.
 

merlin

Active Member
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Jul 3, 2003
Messages
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DN32su
After several years with DSD+FL, I think I have all the proper settings.
Yes, the system uses RAS. Funny, the school busses have to monitor this site, why won't the XPR ?
Good example, school district is TG 30. One RID is 6111, probably dispatch is 6007.
When slot 1/2 shows, USUALLY audio is good and clear, but not always.
Often, there are other RIDs on other channels like hijacking audio. Again, not always.
There are periods of channel activity showing voice but no audio.
Like DSD+ needs to do a lot better with decoding.
It isn't signal, the site is 100 watt, 3.5 miles LOS.
TNX
 

redbeard

OH, PA, WV Regional Admin
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After several years with DSD+FL, I think I have all the proper settings.
Yes, the system uses RAS. Funny, the school busses have to monitor this site, why won't the XPR ?
Good example, school district is TG 30. One RID is 6111, probably dispatch is 6007.
When slot 1/2 shows, USUALLY audio is good and clear, but not always.
Often, there are other RIDs on other channels like hijacking audio. Again, not always.
There are periods of channel activity showing voice but no audio.
Like DSD+ needs to do a lot better with decoding.
It isn't signal, the site is 100 watt, 3.5 miles LOS.
TNX
Since you said it's a Cap+ system, it's the LTR of DMR. You are probably on a rest channel and don't have your traffic channel frequencies, slots, and LCNs set up right in your data files. So you are missing traffic and seeing the rest channel data indicate traffic on an LCN you don't have defined. Other RIDs are maybe from other companies sharing the same Cap+ system.
 

merlin

Active Member
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Jul 3, 2003
Messages
3,102
Location
DN32su
I have been meticulate setting up the data files with needed info.
I log a dozen groups and all do have some RIDs that are clear, but not always consistent.
My target is group 11, the metro bus company, RID 1401 is the B bus. when I see it come up on channel activity
sometimes, it is clear, others no audio.
Not much different with group 30, the district school bus, with about 8 RIDs.
The site is a 3 repeater, channels 1/2, 3/4, 5/6. the rest channel changes to any one of those.
When the site gets active, it is like an RID hijacks the clear RID I want weather clear or not.
somewhere, someone posted an edit to FMP where you only get a certain group or RIDs and dumps everything else.
That part I lost, but would be nice for what I want.
Logic dictates I only will hear one voice channel at a time.
 

merlin

Active Member
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Jul 3, 2003
Messages
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Location
DN32su
Anytone still won't decode RAS transmissions
Yea, I understand RAS a bit and programming receive has switches that circumvent this simple security.
It means being connected to the site and looks like cloning may be an only option.
 

TampaTyron

Beep Boop, Beep Boop
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Feb 1, 2010
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Phoenix, AZ
RAS corrupts the audio packet checksums, so not correct RAS key shows up as bad frames which are discarded. With RAS key, the checksums are corrected and packets are passed. TT
 

merlin

Active Member
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Jul 3, 2003
Messages
3,102
Location
DN32su
RAS corrupts the audio packet checksums, so not correct RAS key shows up as bad frames which are discarded. With RAS key, the checksums are corrected and packets are passed. TT
Then explain to me why some packets are corrupt and some are not. My study shows RAS does not bother voice packets.
 
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