SignallyCurious2

Not enough traffic to confirm this morning - dump trucks seem to be a common phrase leading me towards this.

That would be the offending signal - I’m listening to them crystal clear right now. Truck 850 just got back in the yard

The NEXEDGE48 system is construction workers working somewhere in downtown Detroit. Lots of broken English / heavy Spanish accents, talking about Congress street and Jefferson, heading back up Woodward. I’ll upload calls a little later when I have a bigger batch

The radio alias is populating via the decoder, dsd+ doesn’t hook into RRDB like sdrtrunk does.

I had to make some adjustments, it’s picking up 2 systems. A NEXEDGE 48 system on 462.5325 which is the offending signal and a IDAS system which is delta com single site on 462.5375, which they confirmed as theirs. The nexedge 48 site just keyed up and the guy is at Jefferson and Congress, downtown Detroit currently.

I’ll update this once I have enough humint to determine what the business is

Yes, that is too far away. You lose signal completely by 13 and greenfield

Yes, I have a subscription. It is populating customer radio ID data, which I’m confirming with delta com. So far nothing correlates to the RRDB listings, nothing even close.

at this point my focus is gathering calls and extrapolating who it is, which will lead us to the result. I understand what you’re saying in theory, but it doesn’t add up to the real world results.

It says it’s an IDAS system as well

I’m waiting to hear back from delta com now its 100% a landscaping company - couple dozen calls so far. Unable to determine who it is yet - still doesn’t add up to being a deltacom customer because there is no repeater in this area. We’re gonna see though!

DSD Fastlane decoders are working - I got 3 voice calls clear as day. Now we listen in for the details.

This is the calls using a nxdn decoder. I have samples of encrypted P25 traffic from MPSCS system that sound just like that, I’m hoping the dsd+ fast lane decoders will work better.

And it’s possible I don’t understand what you’re asking too, this has been a whirlwind of information.

I know it isn’t delta com because he keyed up those two frequencies, separately, from three different repeaters so we could get a read on them and rule them out.

Here are 10 calls decoded from sdrtrunk - with message blocks saying it’s encrypted Trunking Recorder_Site-Signal Find_Signal Find_Calls-1-9_2024-03-24_163128.mp3

The frequency I’m measuring is the transmitter as I have confirmed multiple times through this process by adjusting the PPM of the oscillator via software used against stable, confirmed signals in the same band. The SDR is not part of the equation as I’ve done multiple controlled tests to rule it out. Not to mention it’s a RSP1A, not some cheapo China boy. What we are left with is a transmitter that is inbetween those channels. That’s what I’m here to figure out.

I created a catch-all talkgroup recording setting in SDRTrunk, got this back so far. Which is the same result as I’ve been getting, im hopeful I can catch some sort of bit or piece from it. 2024-03-24_122737_2-DMR_-_Signal Find_Signal Find.mp3

This is the amount of message blocks, not necessarily calls from the above data

This is what I’ve captured so far plain_decodes.pdf

That’s the thing, There’s SO MUCH in the area and the signal is so random it’s just not possible. I have a HT but again, the freq they’re on isn’t centered so using anything it will sort of pick it up but it’s just interference between multiple channels unless you can tune inbetween channels. Anyone who wants to go check it out in person will see what I mean, there is so much vehicle traffic and so very little place to just stop and wait for the next one. It might be 2 hours in between bursts. im organizing the data logs and will post them shortly.

The other thing that just crossed my mind - what if this is a residential based signal and it’s just someone who bought a cheapo repeater from alibaba.

The gold star is the water tower, and the signal is strongest within 1/4 mile radius of the star.

The modulation is different, the signal is weak, and they’re centered on the freqs they use. When I say this thing is strong, it would take ALOT for my man to blast the front end out of my SDR on low gain, inside my 1st floor townhouse, with a rubber duck antenna not near a window, from Southfield. Im a disabled combat vet, this is not my first foray into hunting down signals, what is so difficult is how many antennas and how much industrial businesses are in the area of interest The next step is DSD+ Fastlane, it has better NXDN decoders than SDRTrunk, if I’m unable to extrapolate who it is / what they’re talking about, delta com and myself are going halfsies on a KrakenSDR and finding the signal for good. By the time you purchase the SDR, their 5 antennas, a raspberry Pi 4 and an android tablet is about $1k, but having the setup and being able to track any signal moving forward is worth the investment.