Chicago Fire Dept. 2012
- Thread starter werinshades
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Project 25 digital does not have selectable wide/narrow mode. The specification for deviation is something like 2.7kHz or 2.8kHz if I recall. That's a little bit wider than narrow analog FM.
Funny, but you can sure program the Motorola Quantar for P25 CAI in wideband. All but one ham repeaters in Chicago are running wideband. I know that it was meant to be used in a 12.5khz narrowband spacing. I really have no comment on the modulation C4FM, CQPSK question this is a scanner forum.
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Switched Sunday and all appears to be going well from both the user and listener end. Have some occasional "user blips", but no major "failures" to report. What a difference...enjoying the crisp, clear sound.
I started tweaking this on Monday on my 996XT. This is a unique system as it's a one-channel trunk system, and two seperate talkgroups are used for the disaptch and the ambulances. That is the challenge to catch both sides of the transmission. What I ended up doing is putting both EMS North & South in one system, Radio ID Group (No GQK assigned), set the Delay and System Hold to 0. This makes it more tolerable listening and doesn't cause the scanner to miss replies. I have 1 scanner dedicated to EMS, so it doesn't have to scan numerous systems.
I also have programmed the 2 systems seperatley in 2 different SQK in the event of a major incident and I only want to monitor EMS North or South. Have one System dedicated to the analog channels under it's own SQK. This seems to be the best way that I can find that I can monitor this single channel trunk system using two seperate talkgroups for dispatch and ambulances.
Switched Sunday and all appears to be going well from both the user and listener end. Have some occasional "user blips", but no major "failures" to report. What a difference...enjoying the crisp, clear sound.
I started tweaking this on Monday on my 996XT. This is a unique system as it's a one-channel trunk system, and two seperate talkgroups are used for the disaptch and the ambulances. That is the challenge to catch both sides of the transmission. What I ended up doing is putting both EMS North & South in one system, Radio ID Group (No GQK assigned), set the Delay and System Hold to 0. This makes it more tolerable listening and doesn't cause the scanner to miss replies. I have 1 scanner dedicated to EMS, so it doesn't have to scan numerous systems.
I also have programmed the 2 systems seperatley in 2 different SQK in the event of a major incident and I only want to monitor EMS North or South. Have one System dedicated to the analog channels under it's own SQK. This seems to be the best way that I can find that I can monitor this single channel trunk system using two seperate talkgroups for dispatch and ambulances.
Sadly, the new system is close to unmonitorable for me in NW Cook county.
It will decode the NAC but that's about it on a rubber duck. Spotty decode on an external antenna.
The signal strength is there, it's the simulcasting that's causing the problem, just like SC21.
It will decode the NAC but that's about it on a rubber duck. Spotty decode on an external antenna.
The signal strength is there, it's the simulcasting that's causing the problem, just like SC21.
sixtytwo;1741238The signal strength is there said:
Simulcast and trunking are not the same thing.
You can have a simulcast system that's trunked, and one that isn't.
You can have a trunked system that's simulcast, and one that isn't.
Simulcast refers to having multiple, synchronized transmitters working at the same time on the same frequency transmitting the same message. You can use this transmitting technique on non-trunked systems, and on trunked systems. Correctly used, it fills gaps in base station coverage, which is why it's used. Unfortunately, it also causes problem with scanners, especially those outside the intended coverage area, like mine.
Also, you keep referring to this system as a single-channel trunked system. This doesn't make any sense. I suspect you want to see unit IDs displayed and the only way you can make this happen with your scanner is by programming with one frequency. That's fine, but that doesn't make it a single-channel trunked system, which is pretty non-sensical. It's like a 1-lead EKG or a defibrillator with one paddle.
The CFD system, as it stands now, is simply a collection of repeated frequencies with no control channel - hence there's just no trunking involved - there can't be.
You can have a simulcast system that's trunked, and one that isn't.
You can have a trunked system that's simulcast, and one that isn't.
Simulcast refers to having multiple, synchronized transmitters working at the same time on the same frequency transmitting the same message. You can use this transmitting technique on non-trunked systems, and on trunked systems. Correctly used, it fills gaps in base station coverage, which is why it's used. Unfortunately, it also causes problem with scanners, especially those outside the intended coverage area, like mine.
Also, you keep referring to this system as a single-channel trunked system. This doesn't make any sense. I suspect you want to see unit IDs displayed and the only way you can make this happen with your scanner is by programming with one frequency. That's fine, but that doesn't make it a single-channel trunked system, which is pretty non-sensical. It's like a 1-lead EKG or a defibrillator with one paddle.
The CFD system, as it stands now, is simply a collection of repeated frequencies with no control channel - hence there's just no trunking involved - there can't be.
Thanks for the "schooling". To clarify, the "single-channel trunked system" I refer to is for programming purposes on the XT models of Unidens. Yes...to monitor Radio ID's (If that interests you of course), then that will work. I do not know how the GRE models are set up, so if anyone cares to chime in...
FireBuffChgo23
Member
Need help with Pro106,197 programming.I'm using PSREdit500 set as follows: system as P25 auto,multi-site off,ID as wildcard & object as talkgroup but i'm getting nothing. I have the new digital freq. in same scanlist as the conv. CFD,it should work this way correct ?
Its not a P25 Auto, thats for Starcom which is a trunk system, its a P25 UHF freqy repeated...Program it as a normal conventional freqy and in the PL menu mark it P25 and it will show the "NAC".....
"New" Radio ID's
Numerous radio checks this morning on the Main Fire Channel this moning. Seeing numerous different ID's...low numbers...probably portable radios...maybe future fire company officer radios?
Numerous radio checks this morning on the Main Fire Channel this moning. Seeing numerous different ID's...low numbers...probably portable radios...maybe future fire company officer radios?
Mikepepd
Member
"Shades",
First, thanks for keeping us all up to date. I have been lurking and using the useful information posted for sometime.
Regarding programming the Uniden digital series, I am about to put the new EMS freqencies into my 996T using the messages posted previously. However, to clarify, does each frequency need its own "system" in Uniden speak? Can they be grouped? You also touched briefly on how your were going use QK setup. Could you give me the "for dummies" review of how to enter them?
Thanks,
Mike (formerly 623)
First, thanks for keeping us all up to date. I have been lurking and using the useful information posted for sometime.
Regarding programming the Uniden digital series, I am about to put the new EMS freqencies into my 996T using the messages posted previously. However, to clarify, does each frequency need its own "system" in Uniden speak? Can they be grouped? You also touched briefly on how your were going use QK setup. Could you give me the "for dummies" review of how to enter them?
Thanks,
Mike (formerly 623)
More Updates....
I was at 31st Sacramento yesterday for some ambulance maintenece issues, and stopped off at the radio shops to nose around a bit. I don't know how some of you are monitoring (Radio ID feature...if available), but went to get some clarification on the number scheme they were/will be using:
Engines: i1xxxxxx
Trucks: i2xxxxxx
Battalion Chiefs: i3xxxxxx
EMS Field Chiefs: i4xxxxxx
Ambuances: i5xxxxxx
Cars/Command Staff: i6xxxxxx
Specialty Vehicles: i7xxxxxx
Spare Vehicles: i8xxxxxx
Spare Portables: i9xxxxxx
Miscellaneous Vehicles: i0xxxxxx
**Look for all CFD companies to be on the Digital system before the NATO Summit***. Alot of testing going on "new" Radio ID's.
I was at 31st Sacramento yesterday for some ambulance maintenece issues, and stopped off at the radio shops to nose around a bit. I don't know how some of you are monitoring (Radio ID feature...if available), but went to get some clarification on the number scheme they were/will be using:
Engines: i1xxxxxx
Trucks: i2xxxxxx
Battalion Chiefs: i3xxxxxx
EMS Field Chiefs: i4xxxxxx
Ambuances: i5xxxxxx
Cars/Command Staff: i6xxxxxx
Specialty Vehicles: i7xxxxxx
Spare Vehicles: i8xxxxxx
Spare Portables: i9xxxxxx
Miscellaneous Vehicles: i0xxxxxx
**Look for all CFD companies to be on the Digital system before the NATO Summit***. Alot of testing going on "new" Radio ID's.
Chicago2210
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According to this article the Fire side will start training in June and will switch before the end of the year e « CBS Chicago
I am pretty sure Werinshades has a little more instight than the channel 2 news
LOL....thanks FFPM! I just ask people who know or are in the job of programming our radios. Their were boxes of radios there...some programmed, some being programmed as I stood there. I was told months ago during a union health & safety meeting that "EMS will be first to switch, followed shortly by Fire Supression". March for EMS, April for Fire. So, based upon this schedule, April for EMS, May for fire would probably be correct. Radio shops may be working Saturdays to make this happen...so if you hear testing on the Digital Fire Channels on weekends, that's it.
fullmoon
Member
I have a 396XT and have no idea how to program these.
Two ways actually. Program it as conventional, group each frequency as you would...or, if you want to see the Radio ID's, P25, One-Channel Trunked.
fullmoon
Member
Got it and Thank You kind Sir. Very easy actually. I live in Kankakee County, so sometimes I get good reception and sometimes I have trouble getting the transmissions.
FireBuffChgo23
Member
I believe the metro 2 freq. listed to be wrong as all I hear on it is Cta transmissions.I talked to a friend today who is a PO during the Cermak/Mich. protests who had his radio on and he was getting nonstop activity of the goings-on in that area.
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