scottyhetzel
Member
Makes sense,,ICIS users use the access channel TG, non joint powers use the non trunking old channel.
ICI Trunked System - Posts your new findings here!
Makes sense,,ICIS users use the access channel TG, non joint powers use the non trunking old channel.
The Montebello site is always the strongest at my QTH in Cerritos. Just reading this message at about midnight. The CC on 482.0375 is strong with 100% decode. I hear absolutely nothing on 482.6125. Perhaps it is not on at night. Will listen during day sometime.
Steve AA6IO
Steve AA6IO
Same here as @sshermanmd. Analog on .0375 100%, nothing on .6125. Will give it another listen later in the day.
I heard some activity on Sierra Madre ICIS channel 1 this morning and one officer said to go to channel 2 and so I went to Sierra Madre Admin and did not hear anything so does this mean it's encrypted or is there channel 2 one of there VHF old channels.
Running 536HP with ARC536PRO today looking for Irwindale and La Verne on old frequencies on LA Cities. Have 65 hits for Irwindale PD on 460.250 analog and 15 hits for La Verne on 506.2125 P25 NAC A7D. So it looks like they still use the old channels, at least some of the time. BTW, during same 6-hour period, 398 hits for Beverly Hills PD Dispatch analog on 453.5250.
Steve AA6IO
Steve AA6IO
I guess Glendale having some interference issues which is causing intermittent outages as site alarms shut frequencies down.
Glendale 4.1 "narrowband" cell (Site 1) received numerous "Illegal Carrier" alarms, each temporarily making a given RF channel unavailable. Indications are that this may be the result of the recent warm weather causing radio signals from Mexico to propagate farther than usual and interfere with our receivers. This would also account for the surge of bleed-over events reported by GPD in recent days. Normal system responses to diminished capacity likely caused the brief and intermittent outages experienced today.
As Glendale transitions from the legacy narrowband 4.1 cell ("Site 1") to the new P25 cell ("Site 11") the actual RF channels where conversations take place are spread among the two cells. There are 8 channels currently used in Site 1 and 6 currently used in Site 11. It appears that while the high-level “Zone” controller knew that certain channels are unavailable in Site 1 the cell’s “Prime Site” simulcast controller did not. When less than 50% of channels are usable the affected transmitter and receiver locations (“sub-sites”) are automatically disabled. Since the Prime Site controller already considered 43% of its channels to be out of service simultaneous Illegal Carrier alarms on any two channels caused specific sub-sites to be taken offline. When the interference was received at all sub-sites the entire Site 1 cell became unavailable. This was reporting by monitoring applications to have occurred very briefly 5 times today. No reports were received from users.
In order to prevent further outages the parameters of Site 1 were changed late this afternoon such that it does not detect or report Illegal Carrier alarms. This will keep all 8 RF channels available and prevent the entire cell from going offline. Garbled audio may be heard should an ICIS transmission take place on a channel currently receiving interference if the interfering signal is sufficiently strong. This will not normally be the case as the interfering signals are believed to be quite distant and thus quite weak.
This is a short-term Band-Aid solution. A more proper remedy is to tell the Site 1 Prime Site controller that the channels moved to Site 11 do not exist in Site 1. This will increase to 4 the number of channels that can be out of service before a sub-site is disabled. Illegal Carrier detection could be re-enabled at that time to protect the quality of ICIS transmissions by making a channel receiving interference temporarily unavailable. We will be working with Motorola to effect this or another appropriate change and provide notifications when and if they are necessary.
In other news, I hear the new SGV site had some pretty serious interference issues as well since they are using business band frequencies so Motorola a while back took some of them off line.
If any one can check the control channel and reconfirm what the current set up is on SGV, that would be great. Please post/submit findings.
Glendale 4.1 "narrowband" cell (Site 1) received numerous "Illegal Carrier" alarms, each temporarily making a given RF channel unavailable. Indications are that this may be the result of the recent warm weather causing radio signals from Mexico to propagate farther than usual and interfere with our receivers. This would also account for the surge of bleed-over events reported by GPD in recent days. Normal system responses to diminished capacity likely caused the brief and intermittent outages experienced today.
As Glendale transitions from the legacy narrowband 4.1 cell ("Site 1") to the new P25 cell ("Site 11") the actual RF channels where conversations take place are spread among the two cells. There are 8 channels currently used in Site 1 and 6 currently used in Site 11. It appears that while the high-level “Zone” controller knew that certain channels are unavailable in Site 1 the cell’s “Prime Site” simulcast controller did not. When less than 50% of channels are usable the affected transmitter and receiver locations (“sub-sites”) are automatically disabled. Since the Prime Site controller already considered 43% of its channels to be out of service simultaneous Illegal Carrier alarms on any two channels caused specific sub-sites to be taken offline. When the interference was received at all sub-sites the entire Site 1 cell became unavailable. This was reporting by monitoring applications to have occurred very briefly 5 times today. No reports were received from users.
In order to prevent further outages the parameters of Site 1 were changed late this afternoon such that it does not detect or report Illegal Carrier alarms. This will keep all 8 RF channels available and prevent the entire cell from going offline. Garbled audio may be heard should an ICIS transmission take place on a channel currently receiving interference if the interfering signal is sufficiently strong. This will not normally be the case as the interfering signals are believed to be quite distant and thus quite weak.
This is a short-term Band-Aid solution. A more proper remedy is to tell the Site 1 Prime Site controller that the channels moved to Site 11 do not exist in Site 1. This will increase to 4 the number of channels that can be out of service before a sub-site is disabled. Illegal Carrier detection could be re-enabled at that time to protect the quality of ICIS transmissions by making a channel receiving interference temporarily unavailable. We will be working with Motorola to effect this or another appropriate change and provide notifications when and if they are necessary.
In other news, I hear the new SGV site had some pretty serious interference issues as well since they are using business band frequencies so Motorola a while back took some of them off line.
If any one can check the control channel and reconfirm what the current set up is on SGV, that would be great. Please post/submit findings.
hpycmpr
Member
Per Pro96com the control channel is now 451.6000. Also 461.4875 is gone from the site activity list and 451.1625 is added as an alternate. The rest of the alternates are the same, so far. I'll submit this shortly.
Just checking other ICIS cells on Pro96com and found Pasadena has DELETED the following from their list: 477.1625, 477.3125, 477.4625 MHz. This leaves the Pasadena cell with 12 channels.
Also, Glendale has ADDED 470.1375 and 470.2125 MHz to their cell.
Control and alternates are unchanged for both of the above. This submitted too.
Steve
Just checking other ICIS cells on Pro96com and found Pasadena has DELETED the following from their list: 477.1625, 477.3125, 477.4625 MHz. This leaves the Pasadena cell with 12 channels.
Also, Glendale has ADDED 470.1375 and 470.2125 MHz to their cell.
Control and alternates are unchanged for both of the above. This submitted too.
Steve
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Unitrunker sitting on Pasadena shows 477.4625 last used at 00:18:50 (roughly 6.5 hours ago). 477.3125 shows a last of 1/12/15 and 477.1625 shows 2/4/15.
Additional pair of frequencies for Glendale P25 site added.
On Glendora site are you sure about 451.1625? I cant find a corresponding license that matches.
And for Pasadena, I suppose we leave in the 3 frequencies alone as there has been recent activity noted. Maybe there wa some temporary work occurring which kept them off the air when you were monitoring.
Thanks for updates.
On Glendora site are you sure about 451.1625? I cant find a corresponding license that matches.
And for Pasadena, I suppose we leave in the 3 frequencies alone as there has been recent activity noted. Maybe there wa some temporary work occurring which kept them off the air when you were monitoring.
Thanks for updates.
hpycmpr
Member
451.1625 is still shown as an alternate channel in the Pro96com site activity list tonight.
I agree with not being too hasty to remove channels. The move to P25 is supposed to be concluded this Spring. So many changes, permanent and temporary, should be expected.
Steve
I agree with not being too hasty to remove channels. The move to P25 is supposed to be concluded this Spring. So many changes, permanent and temporary, should be expected.
Steve
hpycmpr
Member
Listening off and on since yesterday I'm hearing only encryption from Azusa, Covina, and Glendora. Nothing from the other three cities. This is thru ICIS, not conventional. CC is 451.600.
Steve
Steve
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In listening tonight to this feed in 5-0 radio on iPhone I am defiantly hearing Azusa based on calls and locations. Is it possible that traffic is going out not encrypted. I would think if this is going out in a PC stream someone is picking this up in the clear.
Aero125
Member
The online broadcastify stream has the red star, which indicates it is an official stream originating from the department, not going out on the air to someones radio. It is still encrypted on ICIS over the air.
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