phillydjdan
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Can anyone confirm if the 700 sites are all simulcast or seperate "cells"? Meaning is all traffic carried over all sites or just traffic specific to that 1 site?
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troymail
Silent Key
I can say with probably 99.9% certainty that all traffic is NOT carried on all sites.
There are four simulcast "cells" (officially "radio frequency sub-systems" or RFSS for short). Calls are carried on RFSSs based on subscriber units affiliated (or registered, in Harris lingo) to that sub-system. If no subscriber unit is affiliating a particular talk group to a particular cell, that cell will not carry calls on the talk group. This protects the channel capacity of the smaller sub-systems from being bogged down by unnecessary traffic. The central system, because of its footprint, probably carries MOST system calls. So if you're within earshot of it, it may be the best bet to hear most system activity.
On the 500mhz system, some talk groups were "forced" to all cells, meaning that calls on those talk groups were carried system-wide regardless of whether there was an affiliation (this was helpful for scanning users, since a subscriber is only affiliating with the current talk group, and not talk groups being scanned). I'm not sure if this carried true for 700mhz.
When the 700 system was being tested this past year I WAS receiving it on my Uniden 396XT. Now I don't. I haven't changed a thing. It does receive the Control Channel (and even the data on it), but doesn't switch to any frequency for the audio. I use FreeScan and the current RRDB for York County to program. Any ideas? Thanks.
Kris Bearscove
Ham KB1EAR
Kris Bearscove
Ham KB1EAR
That's what I read and understood, but I was in fact receiving it up until 1 or 2 months ago. Talk groups and all. Was it tested in P1 (which I know is a silly question but I promise I was receiving it)? Don't know if I have a late model 396XT or something (I can also receive other P2 across the country during my travels). But ultimately I must resign to the fact that these must be anomalies and I can't truly track P2, at least properly. Thanks for the confirmation! Kris
troymail
Silent Key
Yes - there was quite a bit of Phase 1 activity a few months ago before things started switching - probably because of patching from the old system. I suspect that over time as the transition occurred and more units are fully on the new system and Phase 2, there's probably little to no Phase 1 activity (non surprisingly). Once fully operational (which could be already?) the only time a non-Phase 2 capable scanner will hear activity on the system will be if/when a Phase 1 radio "affiliates" with any given talkgroup (i.e. out of county mutual aid units typically) and then only for the duration of that unit being on the talkgroup.
Time to get a Phase 2 radio.....
EDIT: Also keep in mind that many systems are listed on RRDB as "Phase 2" but they operate full time as Phase 1 ... it's all about what people know/assume/read and submit to RRDB. In many cases, it is true that a given system is Phase 2 capable or compliant but it does not always mean they are actually operating as Phase 2... they've simply prepared themselves to switched if/when they decide to do so. On the other hand, some are truly Phase 2 from the start.
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That's a very good point. I was trying to avoid the inevitable! At least I have a goal now. Thanks again for your time
KrisThat's a very good point. I was trying to avoid the inevitable! At least I have a goal now. Thanks again for your time
You won't see any more phase 1 activity on the system because of the capacity issue. A phase 1 voice call takes up entire voice channel, of which there are a limited number, especially outside the central cell. All mutual aid users who have the ability to connect directly to the York system on the 700mhz side are already using phase 2 equipment, so I doubt you'd even see a phase 1 revert that that purpose.
troymail
Silent Key
From the south, Baltimore and Harford Counties still operate on Phase 1 systems. It is possible that they have/use Phase 2 equipment on their Phase 1 systems but if not, I'd expect at least those mutual aid units to pull a talkgroup down to Phase 1 when a radio affiliates. Just speculating though.
I thought I understood that the old 12xxx talk groups are phase I but the new 5xxxx talk groups are phase II only. You don't want Phase I on the 700MHz though because there are already fewer voice channels so capacity could be an issue. The fewer number of voice channels is because of Phase II.
troymail
Silent Key
Based on what I've seen on other systems, the amount of Phase 1 activity on a Phase 2 system is pretty small and for short durations (exception being possible large structure fires and the like) - typically more for mutual aid fire/ems which runs automatic mutual aid on pretty much a daily basis in most counties. Good systems are designed to anticipate the load and shouldn't have a problem. I suspect/believe there are also "priorities" assigned to talkgroups such that if the system channels do become (over) loaded, the low priority users will be pushed out/off (not permitted to transmit) should that situation occur (speculation but it makes sense in a system carrying critical emergency communications).
Baltimore and Harford Counties (on the fire end of things) are using almost exclusively APX series portables for a few years now.
Anyone know what these are?
Been getting these via the South 500 site. Patches of some sort would be my guess?
Dates indicate when each was first observed.
Channel 1000 ? (07-19-2017)
Channel 1004 ? (02-25-2017)
Channel 1005 ? (02-25-2017)
Channel 1008 ? (02-26-2017)
Channel 1010 ? (02-26-2017)
Channel 1011 ? (07-03-2017)
Channel 1013 ? (02-26-2017)
Channel 1014 ? (07-29-2017)
Channel 1022 ? (02-18-2017)
Channel 1023 ? (02-18-2017)
Channel 1024 ? (07-28-2017)
Channel 1025 ? (07-29-2017)
Channel 1026 ? (02-18-2017)
Channel 1030 ? (07-09-2017)
Channel 1038 ? (03-04-2017)
Channel 1039 ? (03-04-2017)
Channel 1042 ? (03-04-2017)
Channel 1043 ? (07-10-2017)
Channel 1051 ? (07-23-2017)
Channel 1056 ? (08-08-2017)
Channel 1072 ? (08-10-2017)
Channel 1073 ? (08-10-2017)
Channel 1075 ? (06-03-2017)
Channel 1079 ? (08-11-2017)
Channel 1081 ? (06-03-2017)
Channel 1082 ? (08-11-2017)
Channel 1093 ? (07-19-2017)
Channel 1097 ? (07-20-2017)
Channel 1098 ? (07-19-2017)
Been getting these via the South 500 site. Patches of some sort would be my guess?
Dates indicate when each was first observed.
Channel 1000 ? (07-19-2017)
Channel 1004 ? (02-25-2017)
Channel 1005 ? (02-25-2017)
Channel 1008 ? (02-26-2017)
Channel 1010 ? (02-26-2017)
Channel 1011 ? (07-03-2017)
Channel 1013 ? (02-26-2017)
Channel 1014 ? (07-29-2017)
Channel 1022 ? (02-18-2017)
Channel 1023 ? (02-18-2017)
Channel 1024 ? (07-28-2017)
Channel 1025 ? (07-29-2017)
Channel 1026 ? (02-18-2017)
Channel 1030 ? (07-09-2017)
Channel 1038 ? (03-04-2017)
Channel 1039 ? (03-04-2017)
Channel 1042 ? (03-04-2017)
Channel 1043 ? (07-10-2017)
Channel 1051 ? (07-23-2017)
Channel 1056 ? (08-08-2017)
Channel 1072 ? (08-10-2017)
Channel 1073 ? (08-10-2017)
Channel 1075 ? (06-03-2017)
Channel 1079 ? (08-11-2017)
Channel 1081 ? (06-03-2017)
Channel 1082 ? (08-11-2017)
Channel 1093 ? (07-19-2017)
Channel 1097 ? (07-20-2017)
Channel 1098 ? (07-19-2017)
As an end user with Police programming, all I know is that the warning came over my home TG with a warbling alert tone unlike any I had ever heard from YCC. The tone was very similar to the one used by my home NOAA/SAME radio. It certainly got my attention.
I see the TGs for the P2 system no longer include all of the County patches. Can I assume they are being eliminated and patches will be set up on the standard FG TGs?
I guess they are tossing them. Seemed unnecessary anyway.
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