SDS100/SDS200: DMR Slow Scanning?

[Ubbe]

When you program a DMR frequency as conventional it will stop and monitor the idle bursts and any non voice data signalling. If you instead program one frequency per site in a OFT system, as Whiskey3JMC suggested, it will stop briefly on the frequency and only stop longer if it detects voice communication.

/Ubbe

 

[AngWay]

When you program a DMR frequency as conventional it will stop and monitor the idle bursts and any non voice data signalling. If you instead program one frequency per site in a OFT system, as Whiskey3JMC suggested, it will stop briefly on the frequency and only stop longer if it detects voice communication.

/Ubbe

Ok so i should program each dmr freqs in as a one frequency . i will test that out

 

[dave3825]

Only if you actually hear audio, otherwise its a waste of time.

 

[AngWay]

What is the best way to figure out the slot number i have let the scanner run for awhile and then i loaded the folder into universal player and it's showing the same freqs with both slots. you can see in the screenshot below the same freqs is giving both slots. how to i figure out the right one?

 

[AngWay]

I still can't figure out why if i put dsdplus on 155.7000 i will hear traffic but if i put the sds100 on that freqs i don't hear anything

 

[dave3825]

it's showing the same freqs with both slots. you can see in the screenshot below the same freqs is giving both slots.

Its supposed to

DMR is a TDMA mode (Time Division Multiple Access) which means that it allows several users to share the same frequency channel by dividing that signal into different time slots. Each frequency has a slot 1 or slot 2 and each slot can be used by different users. Each user transmits in rapid succession using their own time slot. This allows multiple stations to use the same frequency channel while only using part of the channel's capacity.

 

[dave3825]

I still can't figure out why if i put dsdplus on 155.7000 i will hear traffic but if i put the sds100 on that freqs i don't hear anything

Because your using two different devices that process received digital transmissions differently. Your trying to compare a 700 dollar scanner to a 30 dollar dongle using free software. Latter is going to perform better in most cases.

 

[AngWay]

U are not understanding what i'm asking in sentinel will let you choose slot one or slot two or any ok now how do i know which slot to set the freqs to if it's showing both slots in universal player or do i leave it set to any and thats it. by the way i got it working by setting up DMR one frequency like @Ubbe told me to do now i hear traffic on both dsdplus and the scanner. . and the latter wasn't performing better thats why i asked why is dsdplus picking it up and the sds100 wasn't

 

[AngWay]

does anyone know if it's better to specify a certain slot or just leave it as any?

 

[dave3825]

U are not understanding what i'm asking in sentinel will let you choose slot one or slot two or any ok now how do i know which slot to set the freqs to if it's showing both slots in universal player or do i leave it set to any and thats it.

by the way i got it working by setting up DMR one frequency like @Ubbe told me to do now i hear traffic on both dsdplus and the scanner.

If you set it up like Ubbe said, and your hearing audio, why do anything else?

Do you have tgid for any users on the freq? If not, don't worry about it.


In general, if a specific user (police) always uses slot 1, all the time, and uses the same tg, and another user (fire) uses slot 2, all the time, and a different tg, then you could program as such but would have to have another entry for second slot. You also nee tgid's I believe.





If you leave it to Any, you will hear both slots.

 

[dave3825]

Looking in the db in my area, security always uses slot 2 and maintenance always uses slot 1. So if you wanted things separate in Proscan logs or Univerasal scanner player, you would create 2 DMR One Freq entries and provide the necessary info in each entry. Slot, tgid and cc if needed.

 

[AngWay]

If you set it up like Ubbe said, and your hearing audio, why do anything else?

Do you have tgid for any users on the freq? If not, don't worry about it.


In general, if a specific user (police) always uses slot 1, all the time, and uses the same tg, and another user (fire) uses slot 2, all the time, and a different tg, then you could program as such but would have to have another entry for second slot. You also nee tgid's I believe.

View attachment 172286



If you leave it to Any, you will hear both slots.

yes i have a tg and i was just curious if the slot matters or sped up scanning . it's still funny beacuse it's nxdn encrypted in the database but it's showing DMR now i remember it use to be NXDN encrypted don't know what happened

 

[dave3825]

yes i have a tg and i was just curious if the slot matters or sped up scanning .

Unless 6your able to detect milliseconds in real time, you will never notice.

it's still funny beacuse it's nxdn encrypted in the database but it's showing DMR now i remember it use to be NXDN encrypted don't know what happened

Until you can determine who is actually transmitting and in which mode, you will never know. Don't lose sleep over it. And again, your talking about freqs from a leasing company. Most likely other users on the same freq using different modes besides nxdn.

 

[Ubbe]

What is the best way to figure out the slot number i have let the scanner run for awhile and then i loaded the folder into universal player and it's showing the same freqs with both slots. you can see in the screenshot below the same freqs is giving both slots. how to i figure out the right one?

Looking at the signal strengths in your log your SDS100 seems to be compromised by interference.
At 1:54pm at 155.700MHz you have a -84dBm signal but at 1:52pm you have -108dBm, a 24dB difference.

It could be that you sometimes completely loose the signal, and that never logs, and you get the issues you report that do not always hear from the SDS100 what you can hear from the dongle+DSDplus.

You can often improve SDS100 reception by playing around with different filter settings and also switch the IFX on and off at each filter selection.

/Ubbe

 

[AngWay]

Looking at the signal strengths in your log your SDS100 seems to be compromised by interference.
At 1:54pm at 155.700MHz you have a -84dBm signal but at 1:52pm you have -108dBm, a 24dB difference.

It could be that you sometimes completely loose the signal, and that never logs, and you get the issues you report that do not always hear from the SDS100 what you can hear from the dongle+DSDplus.

You can often improve SDS100 reception by playing around with different filter settings and also switch the IFX on and off at each filter selection.

/Ubbe

Ok i will give that a shot.

I have been playing around with priority scan and trying to figure that out does it work like this, when i'm scanning a bunch of freqs and i set some freqs to priority scan whenever one of those freqs becomes active does the scanner go straight to it? if it's set to DND does that make it do it without interupting the traffic thats currently active? is that how that works?

Oh and i was looking in sentinel and i don't see a option to turn on or off priority scan in it am i missing it?

 

[Enjoi19]

Ok i will give that a shot.

I have been playing around with priority scan and trying to figure that out does it work like this, when i'm scanning a bunch of freqs and i set some freqs to priority scan whenever one of those freqs becomes active does the scanner go straight to it? if it's set to DND does that make it do it without interupting the traffic thats currently active? is that how that works?

Oh and i was looking in sentinel and i don't see a option to turn on or off priority scan in it am i missing it?

SDS100/200 Easier to Read Manual - Priority Scanning

 

[Ubbe]

when i'm scanning a bunch of freqs and i set some freqs to priority scan whenever one of those freqs becomes active does the scanner go straight to it?

No. Prio channels will be scanned more often that other channels. If you have 10 prio channels set to be active then after perhaps 100 conventional channels have been scanned it scans your 10 prio channels, then 100 more of other channels and then your 10 prio again. So it can be a 1-2 sec dealy until a conversation on a prio channel are heard.

if it's set to DND does that make it do it without interupting the traffic thats currently active? is that how that works?

Yes, DND only scans prio channels during a conversation when the squelch closes. If you have many prio channels you will notice that when one user release his PTT and the squelch closes and the responding part instantly starts to transmit, that it can be a delay while the scanner are monitoring the prio channels and the squelch appear to react sluggish and not open fast enough.

For trunked systems there's no prio function active but another TG priority function are instead activated that makes prio on other TG's in the same site when the scanner rests on its control channel.

/Ubbe

 

[AngWay]

Ok Thanks for that.

I am listening to a NXDN48 site and i have found the right RAN for it only problem is i can't put in the tg id because in the sentinel database the freqs is already set . what should i do in these cases should i create a NXDN single freqs and add it there or just leave it how it was in the database.

I'll attach a pic so it might be easier to understand what i'm saying. the highlighted channel is how it is in the seninel database but when it's like that i can't put in a TG id so what should i do?

 

[AngWay]

deleted

 

[AngWay]

What about a NXDN channels will priority work on it say i'm scanning and i have a NXDN48 channel set to priority will it also interrupt or is it only for conventional channels?