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- Nov 16, 2004
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Duke Energy P25 System
- Thread starter AESFTW
- Start date
I guess it depends on what you call a scanner. The P25RX-II and the latest firmware/software does allow you to monitor a TDMA control channel. It has done so before any other solution existed (aside from the subscriber units).
reconrider8
Member
MSS-Dave
Member
Sorry but a straight-up SDR receiver is never going to decode a TDMA control channel.
Just in case the last couple of posters weren't joking. Here is the history of how it unfolded.
forums.radioreference.com
P25 TDMA Control Channel decoding -- requesting help from experts
Hi Folks, It has been reported that some suspect portions of the new AEP P25 multi-state system (a Harris P25 system) being built out, specifically some sites in Texas at this point, are using the P25 TDMA control channel format. I am not aware of any publicly available software that can...
No problem. You obviously don't pay attention to the progression of this. The P25RX and P25RX-II were decoding audio from these systems before anyone else had a chance. I guess I have to go dig it up now. I knew you ****ers would do this.
for the record, DSD+ Fastlane works great on TDMA control channels as well (using standard SDRs - Airspy/RTL, etc)
MSS-Dave
Member
AFIAK and one of the things I learned in the Mastr V class is Harris is the only manufacturer doing TDMA CC, makes it proprietary to them for now. Supposed to be included in the next update to the P25 II standards. @btt , I really need to check into what you have been doing, really cool stuff. Unfortunately, Duke chose to 100% encrypt AES so monitoring just isn't going to happen.
slicerwizard
Member
Be sure to not mention any of the help (TDMA CC samples, etc.) that the community provided you with.
P25 TDMA Control Channel decoding -- requesting help from experts
Ok, was finally able to figure out the base frequency and offsets so I can help verify the site summaries. I still haven't figured out the CRC, so this summary has an X at the end of the line if it occurred multiple times in the file, or (not confident) if it wasn't consistent. I've also...
Read the thread I linked. You were given credit as credit was due. I knew you guys would act like this from your previous posts. Whaterever. I don't give a **** anymore. You take the credit alll you want, but I was the first one to get the decode started on this. The OP25 guy said it couldn't be done from those beautiful 4-FSK samples in the beginning. I decoded them and showed that they were in fact P2/TDMA control channel. The P25RX receivers where the first to decode voice from these new TDMA CC systems. I want credit for that.Be sure to not mention any of the help (TDMA CC samples, etc.) that the community provided you with.
P25 TDMA Control Channel decoding -- requesting help from experts
Ok, was finally able to figure out the base frequency and offsets so I can help verify the site summaries. I still haven't figured out the CRC, so this summary has an X at the end of the line if it occurred multiple times in the file, or (not confident) if it wasn't consistent. I've also...
slicerwizard
Member
I have no clue what set you off or why this is so important to you. At least three decoder projects were involved in this and they all got P25 TDMA CC decoding working in fairly short order. IMO, community members who gathered clean samples also deserve honorable mention. Seems like you have a short fuse or you've been steaming over this (or something) for a while. Don't know what drama (if any) you've been dealing with.
Don't worry dude. I'm use to Jews taking credit for every ****ing thing I do. This is no different. I'll expose them more if you want me to.
MSS-Dave
Member
It's great that you're passionate about your work however your responses now are taking this whole thread way off the rails. Can we keep it on topic and the bigotry to a minimum please? Damn.....
You posted in this thread, but you haven't added anything to it. Why do you post? i'm giving up my career here. You have nothing to add.
Thread cleaned up, reopening.
I don't think I would use the term "proprietary". If other vendors can do it without violating copyrights, but have chosen not to, then it's not proprietary. I think "single-source" would be more correct.
It's funny. If MSI had a TDMA CC people would scream it's just to lock users into buying only MSI radios, Harris does it and it's cool. Funny how that works.
