NFPA recommends against using trunked systems for fireground operations
I would think an 800 MHz. conventional/simplex channel might work out. I think some suburbs did that for a while when they moved operations to trunked systems and it seemed to work well. Of course they don't have the taller buildings CFD has to deal with.
ChicagoRadio736
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LAFD has been using 800Mhz repeated fireground channels for years with no issues so I would guess simplex would work great. Did Schaumburg use a 800mhz fire tac back when they were analog?
Very interesting spot on CH2-CBS at 6pm news how CPD encrypted transmissions all garbled up putting officers in jeopardy
Chicago2210
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And on second city cop Second City Cop: Shooting Issues
MtGreenRdo
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If you listen to the audio from the incident, hard to gather that this is a radio issue perse. The dispatchers and officers seemed all over the place. It was chaotic with no one taking control.
Also odd they choose the scanner guy from twitter and some lawyer as the main source for the story. Maybe CPD should be asked for comment?
Becuse the media wants to slant it in their favor
This is true. As you're reading all of this, keep in mind, the media is no friend of CPD. They want so desperately to have a radio to monitor live as if they're something special, or an advocate for "getting out information for the public". I'm calling BS, and have seen what the local media has done to drive a wedge between CPD and the general public. A lawsuit will not have any bearing on changing the way things are. So everyone can calm down and don't get all excited over this "breaking news". I'm all on board to unencrypt, but watching and reading the way some behave with X (Twitter) postings and all the other nonsense, I understand the reasoning.
Chicago2210
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And I would say the encrypting drove it even farther.
MtGreenRdo
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The twitter folks have become more and more unhinged, probably in some despiration that everything went encrypted and they lost their edge. Curious if Johnson will actually push for unencryption as he said in his campaign, but I doubt it.
Noticing many spare apparatus have been reporting to the radio shops and upon their departure now have apparatus 800 radios. Buggies, Ambulances, Engines. Engine 38 did this yesterday, reported to the OEMC they were special duty to the radio shops (on their portable), and when they returned in the afternoon, had a spare apparatus radio signature. Older spare apparatus radios were UHF only up until recently so not sure what this means as to the future radio system?
Chicago modified the license to add an additional 5 frequencies to Site-1:
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After I looked at this a little further, the additions are from O'Hare's Site 3. 851.8125 has been seen on Site-1 carrying voice traffic for awhile, the other 4 have not been seen in use. Since O'Hare only has CPD and CFD in use on the city's system, it makes sense to do this.
The database could be updated to reflect these changes if desired for O'Hare Site-3:
851.5625v 852.100c 852.7375c 853.100c 853.350c
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I see the change was made for Site-1, but looking at the O'Hare Site-3, I noticed the NAC is now 870 and and no longer 873? I'm not close enough to monitor the O'Hare site to confirm myself. In the near future if someone close by can verify which voice frequencies are in use. The changes might not happen right away, but you never know.
@cubn
Can you remove these talk groups since they're not in use on this system? The departments are using the TETRA system only, but until Uniden adds a TETRA upgrade option, I don't have the talk groups used.. If anything changes, I'll submit the updates.
Can you remove these talk groups since they're not in use on this system? The departments are using the TETRA system only, but until Uniden adds a TETRA upgrade option, I don't have the talk groups used.. If anything changes, I'll submit the updates.
| 2513 | 9d1 | T | ORD SEC | Security | Security |
| 2514 | 9d2 | T | ORD TMA | Traffic Management Authority (TMA) | Law Tac |
| 2515 | 9d3 | T | ORD AMC | Association Management Center (AMC) | Business |
| 2516 | 9d4 | T | ORD MECH | Mechanics | Public Works |
Thanks. I've been going through the talk groups and looking for discrepancies. Can anyone confirm NAC 870 is in use and not 873 at O'Hare?
Yes, NAC 870 is used.
Since I'm not in range of this site, do you know when it changed from 873 that was originally reported? I recall being up there a couple years ago and was monitoring them on the O'Hare site which I had programmed NAC 873. I know it's not a heavily used site, and the System ID is showing as 87D, just making sure it's not being confused. Since Site-1 is 871, Site-2 is 872, and "originally" was reported as Site-3 being NAC 873, that's why I'm asking. Do you monitor it regularly?
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I can also confirm NAC 870. DSD+ currently showing the following for this P25 Phase II site:
853.350 - control channel
852.100 - voice
852.7375 - voice
853.100 - voice?
851.5625 - cwid WQTZ378
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