randyK
Member
Had a few hits on TG# 55584 on the Cane mtn site, This is one of the new Duke Talkgroups. Thanks Randy
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Cumberland co sheriff dept calling in cars to radio shop,testing monitored on viper tg#64880
C92D-011 (MEADWS) site is down, troopers aren't receiving any replies from communications and T88 confirms that site 19 is "Local Trunking Only", so I don't think failsoft is in effect, but a link has died with the otehr sites. Maybe someone else with more knowledge on the subject can explain.
In a Motorola SZ 4.1 system anytime the site looses the link back to the Zone Controller the site will go into site trunking. Since this system does not have an on site zone switch any drop between the site and switch will cause this problem. This can be caused by several scenarios just a few listed below:
1) If the microwave or leased telco T1 back to the Zone Controller is dropped for some reason then the site will do this.
2) If something happens to the site data connection between the site and the zone switch the site will go into site trunking. IE if the DS0 has some errors or something like that out of tolerance
3) If the power supply on the station that controls site data fails this will cause site trunking. There is only one physical connection on all of the the Quantar's backplane's to the site data DS0. That being said the site data can be moved to another station but that would require someone to physically be on site to move the adapter to the other station.
Something to keep in mind here is also that the IntelliRepeater setup has a limited controller in the master Quantar that will allow the site to remain on the air during disruption of any of the above. That being said any units will not be able to communicate with anyone outside of that site at all. They will be able to communicate with other users on that site exclusively. The problem there is that most radios will automatically scan for another Wide Area site upon seeing site trunking..
I hope that helps a bit..
That definitely clears it up, I'm sure a few others will learn from that post as well, excellent job. I was confused as to how the radio techs could talk to local troopers, but those on the other side of the county (on another site) couldn't hear them. Now I understand the local trunking deal and how that works. T88 showed that it switched from LOCAL TRUNKING mode to NO VOICE, as the radio tech worked. He just came up and announced that the local units need to pass it along to switch to Lo-Band to talk to communications. MEADWS is the primary site that the SHP comm ctr affiliates to since it's only a stones throw away. Thank God for back ups & low band.
Is there a way that communications can use a directional antenna and force themselves onto another site? HIWNDY is close by...
EDIT: This is site # 19, MEADWS (Meadows), not site #11 CLNGMN (Clingman's Peak). Sorry for the confusion.
Is there a way that communications can use a directional antenna and force themselves onto another site? HIWNDY is close by...
EDIT: This is site # 19, MEADWS (Meadows), not site #11 CLNGMN (Clingman's Peak). Sorry for the confusion.
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Depending on which direction their control station yagi is pointed in will dictate what site they are primarily affiliated with. That being said I would bet the G4 800 control station yagi is pointed towards Meadows/Peach Knob but I can't say for certain. 800 does bounce around a lot but I doubt the main control station would affiliate with HiWindy off the back and side even with it being bounced off the other mtns. I would suspect it would affiliate with Clingman's instead. Again just an educated guess..
What you heard is exactly how site trunking works. It does not leave you completely without comms. but you are very limited as to whom you can speak with. If one site covers an entire county then that is not an issue if everyone needs to communicate with people inside the county. It becomes a problem when you need to talk with someone on another site or when you need to speak with someone in another zone all together. That gets into Omni-Link and I do not want to get into all those details.
Happy monitoring.
Awesome, thanks for clearing that up.
Bill28227
Member
I just heard a Charlotte Medic unit call for Charlotte Presby Hospital Main on the Charlotte-Mecklenburg Trunk system. The dispatcher replied to the medic unit to go to VIPER system. A short while later I heard the medic unit call Presby on TG 59056. Both sides were digital. I had not heard the Charlotte medic folks on VIPER yet.
I also heard that digital traffic, coming from the Pineville VIPER site. Interesting.......
Moore co conducting flood ops on tg#41728.
basstuba
Member
- Joined
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41728 MOOREEM Moore Co Emergency Management
mhodgson
Member
Some follow up comments to the discussion about Meadows are warranted:
1) In SmartZone or OmniLink, if a site goes into site trunking then radios affiliated to the site WILL search for another wide area site. This is the purpose behind building overlapping coverage thus that if a site goes down, then the radios will be able to continue operating with a site in site trunking. Only when there is NO other wide area site that meets the threshold should the radios return to the site trunked site for any duration.
2) Meadows suffered a power outage and a subsequent failure of the onsite generator to crank, resulting in loss of all AC power to the site. This resulted in the IR site being DOWN as well as low band. Thankfully the G4 cars continued to work off of High Windy and Big Knob in the Buncombe area. Interestingly enough the microwave continued to work both in and out of Meadows which allowed the other two sites to remain online. For those that dont know, the MW network runs off of -48v DC battery power and relys on AC to run the battery charger.
3) An OUTSTANDING effort was made both by Asheville Troop G radio personnel and VIPER team members who worked in very poor conditions to restore emergency power to the site. They worked almost all nite and to my knowledege managed to get it running before the batteries supporting the MW drained. My hats off to you guys (you know who you are) for a job well done. We have an outstanding TEAM.
M
1) In SmartZone or OmniLink, if a site goes into site trunking then radios affiliated to the site WILL search for another wide area site. This is the purpose behind building overlapping coverage thus that if a site goes down, then the radios will be able to continue operating with a site in site trunking. Only when there is NO other wide area site that meets the threshold should the radios return to the site trunked site for any duration.
2) Meadows suffered a power outage and a subsequent failure of the onsite generator to crank, resulting in loss of all AC power to the site. This resulted in the IR site being DOWN as well as low band. Thankfully the G4 cars continued to work off of High Windy and Big Knob in the Buncombe area. Interestingly enough the microwave continued to work both in and out of Meadows which allowed the other two sites to remain online. For those that dont know, the MW network runs off of -48v DC battery power and relys on AC to run the battery charger.
3) An OUTSTANDING effort was made both by Asheville Troop G radio personnel and VIPER team members who worked in very poor conditions to restore emergency power to the site. They worked almost all nite and to my knowledege managed to get it running before the batteries supporting the MW drained. My hats off to you guys (you know who you are) for a job well done. We have an outstanding TEAM.
M
Kudos Indeed. Great job in a situation with adverse weather conditions.
And thanks Mike for the additional info on Meadows.
I know our forum members appreciate the additional insight into situations like this.
Happy Monitoring!
Marshall KE4ZNR
It's always good to see Mr. Hodgson pop up with some good insight, and all other members in the know. The radio guys sure did sound cold, but hats off to them indeed. Again, thanks for the heads up and explinations from the past few members that posted, it's been very educating.
Thanks to an anonymous submission Duke Life Flight Talkgroups are now in the database under Durham County.
Marshall KE4ZNR
I just heard a similar tx between an out of county medic unit and Presby. It may be they now have the hospitals set up to use Viper with out of county units rather than 154.34.
Also, hearing traffic on Viper talkgroup MECKFD (37344).
Actually I meant to say 155.34, not 154.34. Did we lose the ability to edit our posts or am I just missing something?
Cumberland co sheriff calling in cars for either radio exchange or update for viper,unknown start date will listen up and forward any info.
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