MTS2000des,I support a 15 site Astro 25 800MHz system release 7.16 (will be at 20.xx later this summer) with most talkgroups provisioned DDM, some strapped TDMA, using CQPSK-LSM. I ordered one of your units and look forward to playing with it on my system. I'd be glad to provide whatever samples needed to get TDMA working. Most of our subscribers are TDMA capable, but as is often the case, dispatch talkgroups are operating in FDMA mode due to legacy radios affiliating with our zone core and thus downgrading the talkgroup for the duration of their affiliation.
I am glad folks like you are out there keeping the fire going. For what an APX RSM costs, your product has potential. I don't expect "error free" operation or perfection. It's important that folks give products like this a chance. Nothing against Uniden/Whistler (I own an SDS200 and two BCD996XTs), but the delta in price between $250-300 and $600-700 for an SDS is pretty wide. I think the form factor and build of your product is the future of scanning.Thank you! I am looking forward to getting P25 Phase 2 ready. You made my day. You have no idea how close I was to giving up on this whole thing after many months of work (and many more on a related project before that). I have also been getting DMR ready. Mostly working now. I will get an experimental version of that ready for release soon.
Thanks again! I will get the P25RX shipped first thing tomorrow. I am looking forward to your assesment from testing in a challenging environment. I will DM later regarding the P25 P2 samples. I am committed to getting phase 2 added to the firmware. Thank you for offering to help on this!Don't give up on your passion. When you do what you love for a living, it's like being on vacation and receiving a paycheck. I look forward to playing with your product. I have a good system to test it on. Where I live I am dead center between 4 sites and actually right along side them, if that makes sense. Raw RSSI is around -95dbM, symbol error rate on subscriber radios is low (I usually tote my agency issued APX6000 and APX8000, or Kenwood VP6430). The SDS200 has no problem with solid decode and low BER. The 996XTs are horrible OTOH.
Thank you for the reply Falcon4. I realize phase 2 is something that many people will want. I do think that I can offer something different from the op25 / raspi4 solution. The firmware for the P25RX is bare-metal and written in 'C'. (no OS interrupt jitter). The P25RX has a really good RF chain with RF shielding. The other critical part is the symbol syncronizer. This part was critical to getting good performance in our LSM area. I think another engineer who designed subscriber equipment addressed issues related this elsewhere in the "simulcast distortion" threads on this site. I'm sure we will get into that eventually.If you wanna garner serious interest you absolutely have to make it phase 2 capable and it has to compete with op25 and raspi4. If this is a plug and play solution for people unable to do Linux and raspi4 this might seriously pick up traction.
As of the current version of the configuration software, it just does trunked P25 graphically. You can manually enter console commands to enable conventional mode: undocumented example:Will it do conventional P25 or just trunked P25 systems?
Yes, the general configuration page allows you to manually type in a frequency for the control channel to monitor.Can I program a trunked system in manually instead of using the database?
Not yet. What would you like to see demonstrated in a video? Would it be helpful if I made a video demonstrating monitoring a conventional channel with the current software?Any more videos of the radio in action?
Thank you!I'm down to give this a shot. I just ordered one.
From responses so far, I know that I need to add the conventional support into the graphical configuration software.An option in the software for conventional would be appealing especially if you have a long list of frequencies.
This is on my to-do list now.Video of the logging and recording.
You probably noticed I didn't specifically mention sensitivity specs directly in the user-manual. Instead, I chose to specify the first LNA characteristics which are good. Very high IP3 on all bands, level gain on all bands, and good noise figure on all bands. From my bench testing, the sensitivity is good in all the bands. I have quite a few years experience designing RF circuits and board layouts, so I don't think you will be disappointed. Almost all of the monitoring I have done with the device during development has been in the 85x MHz band. I have also been able to receive systems in the 172 MHz, 450 MHz, 770 MHz bands locally. I have not seen any 150 / 900 MHz P25 systems locally, but they should also work great.Have you measired sensitivity on the different bands?