I knew that question would be asked sooner or later. Assuming the Madison Co. SO transmitter site is on Fork Mtn., that is approximately 120 air miles from my location in south central Va. But I do receive the STARS P25 transmission from Fork Mtn. strong enough to decode. I occasionally hear the Madison Co. SO MOTOTRBO on 154.8000 mhz. but their transmissions tend to be short and infrequent. Additionally there are a couple of analog users in MD or NC also on that frequency I hear who are stronger and easily override the Madison Co. SO transmissions. Currently other digital formats reception testing and MOTOTRBO "fine tuning" actions are my higher priority.Thanks for sharing that info. I was just wondering: Have you been able to successfully decode Madison County Sheriff's Office? I imagine it would big help to others if you share whether some of these MOTOTRBO public safety channels could be heard or if they were encrypted (scrambled). If they aren't encrypted, more people might be motivated to pursue the DSD option.
Tnx. That's good news.I can confirm that Madison is not using privacy on 154.8000. Running the DMRDecode program on the signal, here is the information I've obtained:
Color Code 1
Time Slot 1
Group 30901
Orange Sheriff has switched to TRBO on 155.3700 and 155.6850 as well. Here is the information for those two frequencies:
155.3700
Color Code 1
Time Slot 1
Group 10900
155.6850
Color Code 1
Time Slot 1
Group 10902
These two frequencies are not using privacy either. All three should be monitorable using DSD.
Dave
Look again....W2NJS said:Has anyone noticed that, while the listed title of this thread is P25 it's actually about TRBO?
I can confirm that Madison is not using privacy on 154.8000. Running the DMRDecode program on the signal, here is the information I've obtained:
Color Code 1
Time Slot 1
Group 30901
Orange Sheriff has switched to TRBO on 155.3700 and 155.6850 as well. Here is the information for those two frequencies:
155.3700
Color Code 1
Time Slot 1
Group 10900
155.6850
Color Code 1
Time Slot 1
Group 10902
These two frequencies are not using privacy either. All three should be monitorable using DSD.
Dave
Digital Speech Decoder (software package) - The RadioReference WikiIs the DMRDecode program available for download?
No it is not. It is MOTOTRBO/P25!Has anyone noticed that, while the listed title of this thread is P25 it's actually about TRBO?
If you or anyone read my first post on this subject they will understand. It is a link to a another forum thread that documented my trials and tribulations attempting to decode MOTOTRBO signals. Subsequently in tuning vhf/uhf using DSD software additionally some P25 signals were decoded hence the title of this thread "MOTOTRBO/P25 Decode Success". The two threads are subject interrelated.You guys kill me. The thread title is Mototrbo/P25 but nowhere do I see anyone talking about P25.
That is the point of my remark, unless some poor uninformed soul thinks that the two modes are the same thing, which of course they're not.
If you had followed the link included in the original post and read through it, you would have seen statements such as "Tuning several of the VA. vhf frequencies for the statewide digital STARS radio system I heard P25 audio on several active voice repeater systems." The title of this thread is completely valid - the original poster was talking about MOTOTRBO and P25. After the first post in this thread, I asked a question specifically about MOTOTRBO systems, but that doesn't make the title of the thread invalid.You guys kill me. The thread title is Mototrbo/P25 but nowhere do I see anyone talking about P25.
That is the point of my remark, unless some poor uninformed soul thinks that the two modes are the same thing, which of course they're not.
I heard a Madison Co. SO traffic stop comm today at 1220 EDT on 154.8020 mhz.(best reception) MOTOTRBO positive polarity.Thanks for sharing that info. I was just wondering: Have you been able to successfully decode Madison County Sheriff's Office? I imagine it would big help to others if you share whether some of these MOTOTRBO public safety channels could be heard or if they were encrypted (scrambled). If they aren't encrypted, more people might be motivated to pursue the DSD option.
First I recommend you get educated (i.e., learn) as much as possible about digital signals reception in general and specifically MOTOTRBO. Read the RR Wiki links on the subject and all previous RR posts on the subject to include all links within this thread. Do Google searches on the subject. Assemble the necessary system components that technically are "worthy" for decoding digital signals. Make any equipment modification required. Download the appropriate RR Wiki link software. Last learn by doing/experimenting as I did. If you need help ask in the digital voice decoding software forum not here.. Digital signals reception is not as forgiving as analog reception. Like the weakest link in a chain determines its strength, the configuration equipment components used will impact audio reception quality. Receiving MOTOTRBO digital signals additionally requires the correct polarization of the received signal (i.e., either positive or inverted) and MOTOTRBO has a "private" user option which basically encrypts the signal..How do u decode it
Could you list the MOTOTRBO users you've logged? Thanks.In the central Va. area so far I have logged 19 MOTOTRBO users one of whom uses a 2 channel trunked system.
Per your request attached is a screen capture of MOTOTRBO signals received so far. It's a time consuming work in progress effort. As with analog and NBFM comms MOTOTRBO comms also tend to be infrequent, short and non-descriptive. Additionally licensing information may not be available in the FCC database for every MOTOTRBO comm heard. Why I do not know.. Also I may be hearing a couple of signals more distant than my typical central Va monitoring area. Two good DMR signals that frequently system poll with no audio heard so far are in the 454-455 mhz. assigned paging range. They are not analog or digital paging signals.Could you list the MOTOTRBO users you've logged? Thanks.
Dave