Snitches get stitches. At one point they had banned aerial infrared surveillance, so this may be a cool new tool. Though im not a big fan of cops getting shot over pot
On Tue, Mar 8, 2022, 5:58 PM Jaime Solorza <[email protected]> wrote: > I love finding projects like these.. > Years ago I shared military games at McGregor Range caused an STL at > 230MHz to start picking up ground to air communications...over a > popular rock station 99.1FM. > Or an industrial garage door system interfering with a TxDOT ITS vehicle > counting system on Loop 375. > Fun stuff > > On Tue, Mar 8, 2022, 4:35 PM Nate Burke <[email protected]> wrote: > >> I've never run a spectrum analyzer, but I have some old 4' LED Tubes in >> my garage, like back when they were $30 each old, they've got to be 10-15 >> years old at this point, and when the lights are on, I have to be within >> about 15' of the opener for my remote to work. So this doesn't surprise >> me. >> >> On 3/8/2022 5:27 PM, Bill Prince wrote: >> >> This started a discussion with the other group that I'm in. It seems that >> "cheap" LED lights can have unfiltered power supplies in them. Unlike >> offline switchers that most of us are used to (that operate in the >> 20KHz-60KHz range), the power supplies in LED lights operate on a constant >> current basis, and can be switching at rates up around 300 MHz. That was >> news to me, but if you google "LED lights and garage door openers", you >> will get an eyeful. >> >> >> bp >> <part15sbs{at}gmail{dot}com> >> >> On 3/8/2022 3:20 PM, Robert wrote: >> >> Well that's an eye opener... I wonder if the Sheriff knows about that >> "tell"... You could have just found a very Q& _VERY_ D for spotting >> illegal grows... >> >> On 3/8/22 1:39 PM, Bill Prince wrote: >> >> *... from a neighboring operator in the next county.* >> >> ... >> >> I had a fun one last week, thought you folks would appreciate the story... >> >> I got emails from a county supervisor in Santa Cruz. His office had been >> getting calls about a neighborhood where wireless garage door openers had >> stopped working for many residents. Apparently, a local garage door >> company was blaming 5G for the problem. >> [image: :face_with_rolling_eyes:] Oy vey... >> >> I went out to meet with some of the affected neighbors. I tested their >> openers to confirm channel info (390 MHz) and started a drive test of the >> area. At one point, the signal was so strong I was getting overload alarms >> on the spectrum analyzer even with 20 dB attenuation - the signal was off >> the top end of the display which is +20 dBm. So, yeah, STRONG signal. It >> was very wideband, covering the entire 300 MHz band. >> >> I pulled over where the signal was strongest. Looked over and saw a >> solar inverter and disconnects, freshly installed - the galvanized junction >> box covers were still shiny. I tried to talk to the resident, who became >> *super* reluctant to speak with me when I started asking questions about >> his electrical setup. He broke off the conversation and went back into the >> house. Since then, no interference. >> It's possible the problem is the solar setup, but the level of >> interference is (in my experience) more likely due to grow lights, and the >> solar is just there to reduce the PG&E bill. >> >> Photo is the last capture I got before the spectrum analyzer's smoke >> alarm kicked on. >> >> >> [image: Spectrum picture] >> >> ... >> >> -- >> bp >> <part15sbs{at}gmail{dot}com> >> >> >> >> >> >> >> >> -- >> AF mailing list >> [email protected] >> http://af.afmug.com/mailman/listinfo/af_af.afmug.com >> > -- > AF mailing list > [email protected] > http://af.afmug.com/mailman/listinfo/af_af.afmug.com >
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