I stumbled upon this:
Is this legit? (legal issue aside for the moment).. talking purely from the project/electronics standpoint?
It seems to easy, that it wouldnt work as posted?
I found another one (again on instructables) 
This one talks about 800 MHz??
Anyways.. I was just curious. I have a couple of those 433 RF modules laying around.. I suppose I could just 'give it a try' this weekend... but wanted to get your thoughts on this.
Thanks!
s this legit? (legal issue aside for the moment)
Wuh?
but wanted to get your thoughts on this.
Don't do it.
Wasn't the instructables URL warning enough?
haha.. yes, I have learned (through experience and GrumpyMike!) that anything on Instructables should be highly questions of not just ignored.
But I have so little (ie: zero) knowledge in that area.. I felt like I had to question it.
Wuh?
I was asking if the project/link itself was legit? (as in truthful/legitimately worked).. (with any legal/law issues put aside, as I would imagine its not legal to 'jam cell phones'... especially out in public)
So what does that instructable even do? (anything?)
xl97:
Is this legit? (legal issue aside for the moment).. talking purely from the project/electronics standpoint?Thanks!
It seems odd that a 433 MHz transmitter could block a cellphone.
Getting advice on this forum for something that is illegal or unsafe is probably not a good idea though
xl97:
aside, as I would imagine its not legal to 'jam cell phones'... especially out in public)
Not in private either.
Although i think somewhere, French cinemas ? it is allowed.
I dont want advice on how to make one.. more so about the legitimacy of that tutorial.. (seemed like BS.. but with my level of experience cant be sure in this area)
I can't imagine that working at all. If it did anything it could only block reception not transmission. It might do something by overwhelming the input RF filter but it is highly unlikely as the transmitter is so far away in frequency from the cell phone transmitter, that ther should be no effect. If you look at one of the first comments the author said:-
this was very useful from making my mom's phone from getting my academic info message to her phone
So it sounds like wishful adolescent thinking.
Yeah, I didn't quite understand that comment myself.
(I think he's saying he used it to block calls from his school to his moms cell?)
the other link also claims it but with much more techno-bable that I could follow in most areas.
- ('I think to myself: 'why on earth so much garbage is posted and allowed on that site')
If you are referring to "Instructables", they have a "be nice" policy, which means no one is allowed to criticize anything.
Consequently, most of the content is not only useless, some of the advice is so bad that it leads unsuspecting people to destroy their own equipment.
LED sans current limiting resistor.
Is there anything else you need to know in order to answer the question for yourself?
Looks like a 433mhz jammer to me - will interfere with 433mhz RF comms for sure.
...
What's this about interfering with a phone though? those work at different frequencies.....
DrAzzy:
What's this about interfering with a phone though? those work at different frequencies.....
Sure, but most 433Mhz devices put out a lot of 3rd harmonic if they are not suitable filtered, maybe -20dB or more.
But even the harmonics (which would be still be very weak) are not in the areas used by mobile phones.