Wow, that is secure. I’ll bet there is a dtmf cell phone decoder app these days. I used to build a little box called the Tone Trap back in my call back dialer manufacturing days.
From: Mitch Koep Sent: Sunday, April 09, 2017 10:59 AM To: [email protected] Subject: Re: [AFMUG] Were you bored this weekend Chuck ? :) We used this to test the sirens.... http://www.ebay.com/itm/7W-OUTPUT-HIGH-POWER-TYT-TH-F8-VHF-Handheld-Dual-Display-FM-DTMF-2-Way-Radio-/222143191036?_trksid=p2385738.m2548.l4275 On 04/09/2017 11:40 AM, Lewis Bergman wrote: Most I of those we installed ages ago are VHF but the only trigger is either a 2 tone or 5/6 tone paging format. Anyone can duplicate them with a $250 old service monitor off eBay or with a sound card and some specs. Feed that audio into a transmitter and it is pretty simple. All the old service monitors had all the common formats used in rf. On Sun, Apr 9, 2017, 10:28 AM Chuck McCown <[email protected]> wrote: I forgot to mention, our whole system was paid for by the feds about 20 years ago due to the nerve gas incinerator. From: Chuck McCown Sent: Sunday, April 09, 2017 9:24 AM To: [email protected] Subject: Re: [AFMUG] Were you bored this weekend Chuck ? :) Where I live this half of the county is totally covered. Each Wednesday at 3pm it says : “this is a test, this is a test, this is a test of the Tooele county emergency warning system”. Looks like 900 MHz feeding the system. Many times I have thought about commandeering the system to announce the return of Jesus or something. From: Colin Stanners Sent: Sunday, April 09, 2017 3:52 AM To: [email protected] Subject: Re: [AFMUG] Were you bored this weekend Chuck ? :) 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 -- Mitch Koep A Better Wireless 218-851-8689 cell
