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]
<mailto:[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
