Results 1 to 7 of 7

Thread: Remote Siren UHF control question

  1. #1
    Join Date
    Feb 10, 2013
    Posts
    148
    Thanks
    4
    Thanked 32 Times in 23 Posts

    Default Remote Siren UHF control question

    Hi all. Looking for some ideas, and maybe real world experience with this. With low band being phased out for our local FD's (who shared access to low band channels that they and the County dispatch could use) is now being replaced with simulcast UHF from the county. This is fine, however it creates an issue for the local FD's who need to reactivate pagers sirens, etc. Some do primary dispatch, some reactivate locally after the county activates. Some FD's do this on their own paging UHF channel.

    Enter in remote sirens that need to get both activated by county and the local FD. I can replace the low band radios with UHF and parj them on the county page channel, but how does the local FD activate them. Local FD not allowed to TX on the county page channel, even on direct locally.

    Has anyone successfully used scan on a radio at a sire location. The local FD's worry is when county goes down, how do they activate sirens (keep in mind the no TX rule is firm for many reasons on county channel). I don't think Priority scan will work? The secondary paging channel would not be busy as it would be used a a complete back up?

    Thanks, Rob


  2. #2
    Join Date
    Nov 10, 2013
    Posts
    577
    Thanks
    306
    Thanked 402 Times in 236 Posts

    Default

    (keep in mind the no TX rule is firm for many reasons on county channel).
    Don't think you will find a way -- I have done it using Telex CSoft with Page only functions, and Avtec Outposts but in both cases the audio/alert is over multiple talk paths. So when the County transmits they are on the Local FD VHF Paging Freq for Minitors and Sirens as well as their RF. But sending the Tones (QB-II), AKA TX on a channel, has to be done by someone and any plan that does not comply with the "Two is one and One is none" method of disaster planning has probably already failed.

    Good luck with this one..

  3. #3
    Join Date
    Jun 28, 2012
    Location
    Montauk, NY
    Posts
    36
    Thanks
    10
    Thanked 10 Times in 5 Posts
    Country: United States

    Default

    Are you relying on the county simulcast to activate your pagers, and do you have a private UHF channel in mind as a backup for your pagers to scan to? If so you can one-way patch the county simulcast to your channel, and possibly even get the patch to activate only on your tones from the county. That would dump the tones and audio onto your private channel that your siren sits on all the time, and you can send out whatever you want on your private channel.

    The other option is two receivers/controllers at the siren wired in parallel to the contactor.

  4. #4
    Join Date
    Feb 10, 2013
    Posts
    148
    Thanks
    4
    Thanked 32 Times in 23 Posts

    Default

    Quote Originally Posted by kc2tgd View Post
    Are you relying on the county simulcast to activate your pagers, and do you have a private UHF channel in mind as a backup for your pagers to scan to? If so you can one-way patch the county simulcast to your channel, and possibly even get the patch to activate only on your tones from the county. That would dump the tones and audio onto your private channel that your siren sits on all the time, and you can send out whatever you want on your private channel.

    The other option is two receivers/controllers at the siren wired in parallel to the contactor.

    That is what I am thinking at this point. Two RX and decoders wired into one controller. Brainstormed that on the bowl late yesterday.. It truly is where I do the best thinking.

    -Rob

  5. #5
    Join Date
    Jan 23, 2014
    Posts
    229
    Thanks
    2
    Thanked 86 Times in 58 Posts

    Default

    Not sure that it entirely addresses your specific situation but we have had very good luck using Federal Signal Commander activation software and two-way controllers. The interconnect can be analog FSK, P25 data or IP.

  6. #6
    Join Date
    Dec 30, 2019
    Posts
    21
    Thanks
    25
    Thanked 12 Times in 6 Posts
    Country: United States

    Default

    Had the same scenario in NY. Many of the fire departments would re-page on lowband or have "store and forward" units to rebroadcast on lowband. When the county switched to UHF the county would not allow this. Many departments licensed there own UHF or VHF channel and moved to those. The county had installed an informer so many departments opted to use the base radio they got licensed to alert. Over time most have abanded it for text and email alerting but know a few are still using it.

  7. #7
    Join Date
    Feb 22, 2020
    Location
    Blue Ridge, VA
    Posts
    1
    Thanks
    0
    Thanked 1 Time in 1 Post
    Country: United States

    Default

    Most agencies in the south maintained their VHF or UHF systems specifically for paging after migrating to 800. Not many have the sirens anymore (too spread out). We tried using two different radios to receive (scan would not work for us). However, thinking it through testing an older GM300 or similar with only two freqs programmed in and a priority 1 and 2 setup for scan would be an interesting thought. Don't know if it would work.

    They also would allow for the Quick Call II features to be programmed into the radio themselves so that you could receive tones and have a +/- 5v out of the radio to activate siren relays, bay doors etc.

    Dont know if that helps.

    I don't recall if it worked on only the primary channel or both the primary an secondary priority channels.