There are but they are expensive fork lift upgrades. The manufacturers want yippy to replace the whole controller. It is petty easy to wire it in but the government entities are nervous about doing something the manufacturer won't support.
On Sun, Apr 9, 2017, 8:14 AM George Skorup <[email protected]> wrote: > Shouldn't be too hard to fix seeing as how Dallas is on a 700MHz P25 > network. I'm sure there are P25-based controller upgrade/swap-in kits from > siren mfgs. I believe that's what they did here in my neck of the corn. > Either that or cellular. All of the DTMF and/or FSK via RF activated sirens > are gone as of 5-6 years ago. Apparently not in Dallas. > > > On 4/9/2017 4:52 AM, Colin Stanners wrote: > > If it's an old system, it's very possible there's nothing desirable like > authentication/encryption - it may just be "turn on the sirens if you see > any signal on the frequency of 155.555mhz" Anyone with some RF knowledge, a > $300 SDR (HackRF One) and a $50 amateur radio flea market "2 meter band" > amplifier could blanket a city with such a signal. > > On Sun, Apr 9, 2017 at 1:15 AM, CBB - Jay Fuller < > [email protected]> wrote: > > > Sirens are bad right ? > > Create a custom radio on a certain frequency? I am sure these things are > set off with a radio right.... > > > https://www.usatoday.com/story/news/2017/04/08/hacker-triggers-all-156-emergency-sirens-dallas/100212412/ > > > Sent from my Verizon 4G LTE Smartphone > > > >
