Results 11 to 20 of 21
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October 12th, 2005 04:33 PM #11
urban legend! car alarm works on different frequency than our cellphones. there's no way of 'tunneling' the signal of car alarm to that of cellphones signal and relaying it back to the car alarm's reciever in the car (unless you work out some kind of a repeater using your cell... but that's another matter). the case presented is pure myth imo.
oopss... mods sorry for the double post.... paki delete na lang my first post.Last edited by amboy; October 12th, 2005 at 04:38 PM.
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October 12th, 2005 06:20 PM #12Originally Posted by amboy
Carnappers use this Motorola Talkabout Walkie Talkies (I think they the T6226 model) to jam the frequency of these car alarm/devices that supposed to lock the car's doors. Ganito ginagawa nila. The guy would stand a few meters away from his target, holding his Motorola Walkie Talkie. He would wait for the car owner to come out, then once the driver would lock his car doors remotely, sasabayan niya ng pindot yung Walkie Talkie niya (yung "talk" button). The unsuspecting driver would just walk away, without checking the doors if it's really locked. Siyempre, tumunog na, naka-lock na. Yun ang alam niya. Pero, voila, hindi pala!
Doon na e-entra yung "bida", and he can open the doors easily. Limas ang laman ng kotse mo!
Pati yung field reporter, sinubok din yung MO na yun, at talagang gumana!
Dito sa atin, marami akong nakikitang gumagamit ng mga walkie-talkies, this yellow, blue colored Motorola units, sa mga Malls. Yung mga can afford na bumili. Madalas gamit pa nga ng SM security force.
Sabi ko nga, naku kung napanood ng mga "buwitre" ito, magkakaroon na naman ng bagong idea, kung pa'no mapapadali ang MO ng mga carnappers sa atin.
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October 12th, 2005 07:28 PM #13
hmm...funny, my dad and my sis tried this and it did work (i don't think they were kidding)...the car used was my sister's (vios)...the car was in the garage though but our garage is on a separate lot beside our house, separated by a firewall, they made sure that the remote was already not working at the said distance...maybe a case to case basis.
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October 12th, 2005 09:07 PM #15
d ba travelling hanggang 4khz lang max bandwidth frequency ng telephone line, that's why kahit anung ganda ng sound system mo sa bahay, kapag pinarinig mo sa
kaibigan mo on another phone line, d din nya ma-appreciate yun sounds.
although low-frequency lang ang keyless entry system baka pumasok sa limit na 4khz.
but still how can the cellphone speakers transmit that signal at 1 foot distance?
siguro dapat sagutin na ito ng mga ECE dito hehehe
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October 12th, 2005 09:19 PM #16In order to allow more long-distance calls to be transmitted, the frequencies transmitted are limited to a bandwidth of about 3,000 hertz. All of the frequencies in your voice below 400 hertz and above 3,400 hertz are eliminated.
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October 12th, 2005 10:17 PM #17Originally Posted by oldblue
Kaya pansinin niyo minsan pag nagpunta ka sa ortigas ng gabi, at sarado na ang mga opisina, minsan ayaw gumana ng transmitter na pampatay ng car alarm mo, dahil some of the alarm systems na gamit ng mga buildings sa ortigas also use the ISM band. Nakakainterfere siya sa alarm ng kotse mo
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October 12th, 2005 10:30 PM #18Originally Posted by laklak
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October 12th, 2005 10:41 PM #19Originally Posted by BeetOls
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October 12th, 2005 11:01 PM #20Kaya pansinin niyo minsan pag nagpunta ka sa ortigas ng gabi, at sarado na ang mga opisina, minsan ayaw gumana ng transmitter na pampatay ng car alarm mo, dahil some of the alarm systems na gamit ng mga buildings sa ortigas also use the ISM band. Nakakainterfere siya sa alarm ng kotse mo
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