rkillins
Member
I continue my quest in deciphering a local, somewhat inactive, DMR Tier 3 system (MRC SYSTEMS).
In my previous posts, the support and help was phenomenol, and with a better antenna, managed to finally get FMP24 to actually decode the voice frequencies.
I pretty much feel I've figured out Site 2 Wilmot as I have missed no voice transmissions.
TIIInonStd, L6, 2, 1079, 420.7500, 0.0, 0 ;Wilmot
TIIInonStd, L6, 2, 1080, 420.7500, 0.0, 0
TIIInonStd, L6, 2, 1096, 420.8500, 0.0, 0
TIIInonStd, L6, 2, 1095, 420.8500, 0.0, 0
TIIInonStd, L6, 2, 1096, 420.8500, 0.0, 0
This configuration appears to provide accurate tracking.
I have played with this tool to check accuracy, and the Channel IDs (displayed in DSD+ = LSN in the calculator). This tool provides, I believe, and entire system map of LSN (Channel IDs) based on, in my case of known reference of ChID 1079, 420.7500, at 12.5 spacing.
So, I'm now analyzing a new site, site 12. I am actively decoding the CC on 422.7875. DSD+ ,from info gathered from monitoring site 2, claims the ChID number to be 8189. There are voice communications being decoded, but the voice is not being picked up by FMP24 VC. I am clearly missing a frequency - or frequencies.
Question 1 - Where does DSD+ get the channel IDs from, specifically for identifying neighbouring CC ids & frequencies? Are they decoded by DSD+ from within the CC, or does it rely on the user's DSD+ configuration (ie frequency file)?
I do know that 422.7875 is the control channel. DSD+ reports from information gathered from neighbouring site information that it is ChID 8189, which matches what RadioReference has. But I am questioning the accuracy of RR. If the ChID is system provided information via the actual CC, then RR would be accurate. But if DSD+ got 8189 from my frequency file, which was created using RR data, it may be wrong if the RR data is wrong.
The reason I question 8189 being the ChID number for 422.7875, is it does not fit into the system map that the calculator provided, assuming that the system map is consistent with each site within the system (ie site 2 and site 12 share the same system map). The calculator reveals 422.7875 as having a ChID of 1405.
As I mentioned, I am clearing missing one or more frequencies. As I was monitoring this site, my Channel Activity window as some time populated with a ChID number of 1056 and frequency of 420.6000. This frequency is licensed to that the system ower (MRC Systems), so it seems possible this may be the missing frequency. I added this frequency to my frequencies file with CHID number 1055 and 1056. I am not getting any FMP24 VC activity with this frequency. If I use a ChID of 8189 and frequency of 422.7875, with a target ChID (LSN) of 1056 in the calculator, I am getting a frequency of 378.2 which would make no sense.
So, I've approached this process on these assumptions:
1) DSD+ is getting CC ChID and frequencies from the CC data stream. The same information would be provided whether I had a frequencies file for that site or not?
2) ChID 1079 (as broadcast by DSD+) with associated frequency of 420.7500 and channel spacing of 12.5 is an accurate base for the system map
3) DSD+ broadcasts a CHID of 8189 for 422.7875 despite the System map having that frequency assigned to ChID 1405. Which is correct?
4) DSD+ populated a ChID of 1056. Where did that come from? (I'd only added it to my frequency file after it had popped up in my CC Channel Activity with no frequency and associated the calculator frequency with it)
5) The system map (via the calculator) would reference allocate that ChID to 420.6000, which is possible, but not not net any traffic via FMP24 on VC. This could be a reception issue, or improperly reported ChID by DSD+
Based on what I've shared, what can you as someone better understanding of DSD+ and tier 3 systems than I, deduce? I'm trying to use information and tools to better assist me, but I need to know what sources of information to use as a baseline (ie DSD+ reported data like the neighbouring site data for baseline certianties, or data in RR)
In my previous posts, the support and help was phenomenol, and with a better antenna, managed to finally get FMP24 to actually decode the voice frequencies.
I pretty much feel I've figured out Site 2 Wilmot as I have missed no voice transmissions.
TIIInonStd, L6, 2, 1079, 420.7500, 0.0, 0 ;Wilmot
TIIInonStd, L6, 2, 1080, 420.7500, 0.0, 0
TIIInonStd, L6, 2, 1096, 420.8500, 0.0, 0
TIIInonStd, L6, 2, 1095, 420.8500, 0.0, 0
TIIInonStd, L6, 2, 1096, 420.8500, 0.0, 0
This configuration appears to provide accurate tracking.
I have played with this tool to check accuracy, and the Channel IDs (displayed in DSD+ = LSN in the calculator). This tool provides, I believe, and entire system map of LSN (Channel IDs) based on, in my case of known reference of ChID 1079, 420.7500, at 12.5 spacing.
So, I'm now analyzing a new site, site 12. I am actively decoding the CC on 422.7875. DSD+ ,from info gathered from monitoring site 2, claims the ChID number to be 8189. There are voice communications being decoded, but the voice is not being picked up by FMP24 VC. I am clearly missing a frequency - or frequencies.
Question 1 - Where does DSD+ get the channel IDs from, specifically for identifying neighbouring CC ids & frequencies? Are they decoded by DSD+ from within the CC, or does it rely on the user's DSD+ configuration (ie frequency file)?
I do know that 422.7875 is the control channel. DSD+ reports from information gathered from neighbouring site information that it is ChID 8189, which matches what RadioReference has. But I am questioning the accuracy of RR. If the ChID is system provided information via the actual CC, then RR would be accurate. But if DSD+ got 8189 from my frequency file, which was created using RR data, it may be wrong if the RR data is wrong.
The reason I question 8189 being the ChID number for 422.7875, is it does not fit into the system map that the calculator provided, assuming that the system map is consistent with each site within the system (ie site 2 and site 12 share the same system map). The calculator reveals 422.7875 as having a ChID of 1405.
As I mentioned, I am clearing missing one or more frequencies. As I was monitoring this site, my Channel Activity window as some time populated with a ChID number of 1056 and frequency of 420.6000. This frequency is licensed to that the system ower (MRC Systems), so it seems possible this may be the missing frequency. I added this frequency to my frequencies file with CHID number 1055 and 1056. I am not getting any FMP24 VC activity with this frequency. If I use a ChID of 8189 and frequency of 422.7875, with a target ChID (LSN) of 1056 in the calculator, I am getting a frequency of 378.2 which would make no sense.
So, I've approached this process on these assumptions:
1) DSD+ is getting CC ChID and frequencies from the CC data stream. The same information would be provided whether I had a frequencies file for that site or not?
2) ChID 1079 (as broadcast by DSD+) with associated frequency of 420.7500 and channel spacing of 12.5 is an accurate base for the system map
3) DSD+ broadcasts a CHID of 8189 for 422.7875 despite the System map having that frequency assigned to ChID 1405. Which is correct?
4) DSD+ populated a ChID of 1056. Where did that come from? (I'd only added it to my frequency file after it had popped up in my CC Channel Activity with no frequency and associated the calculator frequency with it)
5) The system map (via the calculator) would reference allocate that ChID to 420.6000, which is possible, but not not net any traffic via FMP24 on VC. This could be a reception issue, or improperly reported ChID by DSD+
Based on what I've shared, what can you as someone better understanding of DSD+ and tier 3 systems than I, deduce? I'm trying to use information and tools to better assist me, but I need to know what sources of information to use as a baseline (ie DSD+ reported data like the neighbouring site data for baseline certianties, or data in RR)
