Nobody ever said I was an “entry level technician” or a technician at all, so not sure where you get that?
There are more TG’s on the system such as the ones used by the specialized investigative units as mentioned above in post 224.
Los Angeles Regional Interoperable Communications System (LA-RICS) - Master Thread
Nobody ever said I was an “entry level technician” or a technician at all, so not sure where you get that?
There are more TG’s on the system such as the ones used by the specialized investigative units as mentioned above in post 224.
krazybob
Member
As I said, no disrespect intended. I wasn't aware that you were a special investigator as well as a technician great amateur radio operator. Working east LA in Walnut must be fascinating? You may even know a few of the people I know from OSS.
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I beg to differ. The APX8000 in my hand with RICS talkgroups in use would say you are wrong.
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I am pretty sure you are right with the talkgroups being encrypted, but have you tried a scanner to see if your test is the same? Not sure how your APX 8000 is programmed or if you are a valid subscriber. But I won't ask anymore questions. Make sure you have the offset and the channel spacing configured right since its on the 400 mhz and 700 mhz system
interagency roll call
Hi, does LARICS still conduct a weekly roll call radio check with regional agencies?
Hi, does LARICS still conduct a weekly roll call radio check with regional agencies?
krazybob
Member
What are the site(s) and specific TG's being used? I've read the LA-RICS page and noted the low power output of the repeaters and I'm curious as a repeater owner how such low coverage area is calculated by RR. Relatively low altitude sites would likely be using 9dBd gain antennas to maximize coverage from a low altitude. Simulcast optimized HCQPSK modulation allows for ≥ –100-dBm BER reception and I'm wondering if they are simulcasting yet or just testing individual sites.
krazybob
Member
I don't know who the frequencies or license to.
All LA RICS frequencies are licensed to the County of Los Angeles.
krazybob
Member
I checked for Los Angeles County Of and didn't find LA-RICS by that name. What name is it listed as?
You will not find anything under LARICS on the FCC. They are licensed to the County of Los Angeles as stated above
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http://www.radioreference.com/apps/db/?fccCallsign=WQUP813
http://www.radioreference.com/apps/db/?fccCallsign=WQUF432
Anywhere from 100 to 225 to 250 watts.
http://www.radioreference.com/apps/db/?fccCallsign=WQUF432
Anywhere from 100 to 225 to 250 watts.
krazybob
Member
Then you can understand why when I see a range of 15 miles I asked.
https://www.radioreference.com/apps/db/?siteId=23120
https://www.radioreference.com/apps/db/?siteId=23120
Not necessarily. Simulcast optimization and frequency reuse considerations could dictate highly directional patterns, heavy down tilts, and either very high or very low ERP. Not all of these factors show up in the published licence, but could be reflected in the engineering work done during the coordination process. It's really not possible to accurately reverse engineer a system just on license data.
krazybob
Member
I am very familiar with simulcast and utilize it on my repeaters. But in this case you will find that each site has a different power level. I am familiar with all of the sites. I've been to most. But that wasn't the original question. The question was why RR indicated a range of 15 miles from a site licensed for 300 watts. Oat Mtn. is licensed for 225 watts but claims a 10 mile coverage. Yet my repeater on Oat at 100 watts covers considerably more. Why license for 225 W if the intent is extreme down tilt which I doubt. The sites will undoubtedly have overlapping coverage forming cellular like service. I don't think RR has engineering information that suggests that a particular site has such low power level. Not all users will be affiliated county-wide in actual use.
It's OK. I was just curious and don't need to drag this out. It was just a curious question.
Many talkgroups are active but they are just simulcasts of the 480 system, the field units are actually broadcasting on. The OCS desk (850 or 830 David) might be the exception. When talking directly with them last week on countywide L-Tac they had that digital sound.
Um... OK.
That's a good question. What is RR's source for that data? It doesn't come from the license.
The coverage requirements of a public safety system are defined differently than an amateur system. The system designer may be looking for 95/95 coverage inside commercial structures. Where your repeater may talk out 75 miles to your mobile, it might not be heard 10 miles away in the 7-11 with the portable on your hip.
Signal density in close without providing coverage in the next county. Not saying that's what's being done here, just saying it DOES get done that way sometimes.
Sometimes with enough overlap that the loss of a site can be tolerated.
I don't think so, either, which gets back to my question of where they get that range information.
Well, it's a good question. I offered up possible explanations. Sometimes current coverage design technique runs counter intuitively to how an amateur system might approach the problem.
