Hello, I am a newby SDS100 owner with a new DMR upgrade and also new to this forum. I heard that there are some DMR unencryped LAW frequencies for St Louis & St Charles Counties, and surrounding areas, that are not contained in the DMR Digital Frequency Search database. Are these DMR LAW frequencies posted anywhere in this forum or could someone please share them with me, or provide me guidance on how best to determine what they are? Thanks!
Unpublished DMR LAW Frequencies - St Louis & St Charles Counties, MO
- Thread starter mgavan
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Your going to have to be a little more specific on what you are referring to . Whatever anyone knows of, should already be in the database. There is very little DMR law, except in Franklin County. St Louis and St Charles are ALL going to be on the P25 Trunked systems.
Go to digitalfrequencysearch.com, it'll allow you to search licensees with DMR emissions by state and county. Although the caveat about this site is just because DMR is listed in the frequency emissions doesn't necessarily mean it's in use, just highly probable. I perused through the long list of licenses in the St Louis area and haven't seen any LE agencies. It is highly uncommon, though not totally unlikely for law enforcement to utilize DMR as a voice standard. I can't speak for Missouri but there are a select few, very few in my area who use DMR or NXDN for car-to-car ops
436isthe1
Whistler ws1080/Uniden 436hp/GD-77and Cobra 29 ltd
Yes correct on P25 systems.
436isthe1
Whistler ws1080/Uniden 436hp/GD-77and Cobra 29 ltd
If only they show color codes and time slots. Also there are several countys that use DMR and some on NXDN systems here in Missouri.
well that would spoil the fun of IDing them for us signal stalkers
436isthe1
Whistler ws1080/Uniden 436hp/GD-77and Cobra 29 ltd
Thats why some of us have scan search and wildcards capabilities.
Yes thanks. I have loaded everything from Radio Reference and the DRM database. Someone on Facebook mentioned there being some unpublished LAW frequencies from the St Louis area on DMR. I thought maybe there was an "underground" list that everyone except me knew about. Appreciate the response.
Ha! I don't enjoy so much looking for unpublished frequencies, hearing something interesting then having to determine who/what it is. I'm moreso interested in listening to frequencies that I already know exist and I know who/what they are. Maybe my interests will expand with more experience in this new hobby. Thanks for responding.
What technique would you recommend for me to find UNpublished frequencies? I have an sds100. What frequency range for DMR, and is there a way to SEARCH but EXCLUDE any published frequencies that are already in my Favorites (I loaded into a Favorite all of the DMR db) so I ONLY see those frequencies that are NOT already in my favorite list? Thanks for the guidance while I'm limping along with my new toy.
With DMR you're going to have to land on a control channel and then monitor the voice traffic and figure it out from there. I think DMR can be utilized in all the frequency bands with the exception of the low vhf bands. Wireless USA has a 900mhz DMR trunking system you could start with. I . I highly doubt any legit law enforcement agency is using DMR within St. Louis County, city, and or St. Charles County as everyone upgraded and went to SLATER or MOSWIN. Maybe they are talking about security or something but I doubt its genuine LE.
Thanks for the response and the guidance.
nd5y
Member
Where did you learn that they are using DMR and not some other mode?
How do you know it isn't really a PTT app on a cellular carrier or FirstNet?
How you you know you were not fed BS and believed it?
Which specific law enforcement agency are you trying to find unpublished frequencies for and what system does the agency normally use?
You need to determine that first.
If they are really using radios (DMR or any other) on "secret" frequencies it could be:
1) Existing licensed frequencies that aren't in RRDB. Check all FCC licenses for the city or county in question. Not all of them are in RRDB. They could be using frequencies licensed to one of their neighbors, their county or maybe their state. Federal VHF/UHF interop and 700 MHz interop frequencies might be a place to hide.
2) Leasing air time on a commercial SMR system. You will have to search them individually and not all commercial trunked systems are in the RRDB.
3) Leasing Part 22 Paging frequencies. Search those.
Least likely but still possible:
4) Illegally using frequencies that somebody pulled out or their @$$ and programmed in the radios like marine, amateur, FRS, MURS, broadcast auxiliary, UHF TV, federal government, or anything between 136-174, 380-512, 769-869 MHz depending on the frequency range of the equipment used.
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nd5y
Member
If it's a conventional repeater or simplex there is NO control channel.
I learned about it from a post in a scanners Facebook group. The guy was trying to locate these unpublished frequencies. I was hoping they actually exist. It sounds like possibly not. Thanks for the info above!!
I should have specified that if a legit LE is utilizing DMR for everyday use, and moved off of SLATER or MOSWIN they're likely going to be on some form of infrastructure (control channel = trunking), maybe not but if they're using simplex then good luck. I think this is a waste of time trying to find these. If anyone in LE is using DMR then it's either for some extra special event use or maybe interop with their city or public works. Pretty much every city in St. Louis County is on SLATER in some form. Why would you need to utilize a whole other standard and carry around another radio when 99% of LE in STL is encrypted anyway. There's plenty of interop encrypted talk groups to use as well. Doesn't make sense to me and I think you were fed BS.
Yes. I am thinking the same. Thanks for sharing your perspective. The channels should be busy tonight with the holiday. Happy New Year!
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