Personal computing discussed
Moderators: askfranklin, renee, emkubed, Captain Ned
UberGerbil wrote:If he was into tinfoil hats, he wouldn't have this problem. Well, not if his car was wearing the hat. And he was inside it along with his car. Tinfoil carport? Hmmm, 300mhz works out to exactly 1m wavelength, yes? That's conveniently human-scale. Wonder what the drones at Home Depot would say if you went down and asked them about the best wire for building a Faraday cage? (Clearly as part of the apocalypse coming in 2012 the New World Order is going to prevent us from being able to unlock our cars to run away, since Americans no longer remember how to use actual keys, and they're testing this in Colorado. )
To return to reality, the FAA uses various frequencies in the UHF-VHF range for beacons and communications (and so does the military, as TwistedKestrel noted). It's possible there's some new repeater or facility in your area. You could always try filing a complaint with the FCC, but obviously you need more information (and good luck with that in any event).
Captain Ned wrote:Don't some mobo primary frequency standards run in the 300MHz area?
just brew it! wrote:Have *you* acquired/moved/reconfigured any electronics in your house around the time when the trouble started? Just because something isn't a radio-frequency device doesn't mean it isn't radiating EMI. For example, it could be a PC with sub-standard EMI shielding that got moved closer to the carport or had its BIOS settings changed (tweaking clock settings or disabling "spread spectrum" can shift the frequencies of the emitted EMI).
yogibbear wrote:I can't believe they still install car alarm systems in that band. It has been a known issue that ~300-500MHz gets TONNES of interference from police/radio/etc.
Only thing you can do is the top gear trick of sticking the key to your head when you try to unlock it.
yogibbear wrote:Remote controlled toys run typically at 2.4gHz or 72 Mhz. i.e. they won't be the problem.
ludi wrote:just brew it! wrote:Have *you* acquired/moved/reconfigured any electronics in your house around the time when the trouble started? Just because something isn't a radio-frequency device doesn't mean it isn't radiating EMI. For example, it could be a PC with sub-standard EMI shielding that got moved closer to the carport or had its BIOS settings changed (tweaking clock settings or disabling "spread spectrum" can shift the frequencies of the emitted EMI).
The one possibility that I know of is that I rebuilt my main PC back in October, and then moved 80% of the old hardware into the media PC in the basement. However the media PC is normally shut down, and the new build upstairs -- which would be physically closest to the carport -- is in sleep mode whenever I'm not using it. From an RF perspective it is rather tightly sealed up inside an Antec Sonata (even have all of the spare slot bracket blanks installed). No funky acrylic windows or anything.
videobits wrote:If you go chasing an interference problem, also keep in mind that it could be intermod.
tfp wrote:According to this PDF the only things in the 300Mhz range are Aeronautical Radio-Navigation and Maritime Radio-Navigation Beacons.
http://www.ntia.doc.gov/files/ntia/publ ... lochrt.pdf
If you're by an an AFB that might be is after all.