58mhz jammer

I would like to build a jammer which would jam 8.2 - 58mhz
This would be for blocking RF

I have done a lot of research online and the closest thing i could find was a tv remote jammer and have NE555N.

I found this online
**broken link removed**

also this

**broken link removed**

says the parts list is

1. 0.01uF capacitor
2. 10 ohm resistor
3. 1030 ohm resistor
4. ne555
5. bypass diode

Click to expand...

however i am not sure what a i bypass diode is or where to find it nor am i sure if it would jam 58khz

Any help or advice would be cool. It must be portable and powerful enough to jam a space of 6 ft by 6 ft.

basically what i am trying to achieve is to jam/block my 58khz Rfid fob from being ready by my usb rfid reader. Its a experiment / home project.

it would act as a shield so that i could keep it on my person and no one could read my rfid while i have the jammer active.

Many companies online claim that they are making a shield/jammer for rfid and since Rf is like RFID and it gives off a frequency of 58khz it should be easy to jam?

i apologize for the title of this topic which says 58mhz i meant 58khz

It is against the law to jam radio communications. Maybe if you are in the middle of a huge desert then nobody will be jammed and it won't matter. But I don't think your very simple 555 oscillator will jam anything, especially since its frequency is far too low and it does not have an antenna.

Such a cool gadget! If you could jam an RFID reader, then you could walk out of the library, without checking anything out or worry about late fees. You could wheel out the biggest TV at Walmart, without paying the insane prices, right past the registers, and the old man guarding/greeting at the door. Probably a few mischievous things one could do with such a device. Guess you can't find a circuit or kit on the web, because some people wouldn't like having to come up with a new security scheme...

Could you not just shield a small plastic wallet and keep your RFID keyfob in there when its not being used ?

Better still, how about something like this little tin of mints, as per the attachment.

Easy click-on click-off lid, you will obviously need to find a tin which is large enough for your RFID.
Also make sure that there is good electrical contact between the body and the lid.

Perfect electro-magnetic screening!

The jammer idea is seriously flawed on many levels.

JimB

re

I don't really see the fda or who ever it is in charge of radio coms kicking up a fuss over jamming on your own property when the signal does not go very far at all.

yes you could use one of those wallets but key fobs are quiet bulky and it kind of defeats the idea of building a electronic project.

if it is flawed then why do tv remote jammers, cell phone jammers and gps jammers work? everything has a frequency rfid is just a low weak frequency

You're saying that the keyfobs are quite bulky yet you'd be quite happy walking around with a homebuilt jammer which is going to be at least 10x the volume of your rfid tag to stop people reading your RFID tag .......

Sometimes complex isn't the right solution.

re

I guess i came to the wrong place. As i said i wanted to build one i dont know how. If they bring them out for sale online then i will buy one but since they dont i wanted to build one.

i know that there are plans for a 35mhz online its just a matter of getting the frequency right but if i cant find help then i will just keep searching until i do.

i know the wave bubble can jam similar frequencies and can be programed but i was hoping to not have to program any electronics.

You can't jam a transmitter. Jamming ONLY occurs at the RECEIVER. So your jammer transmitter would need to be powerful-enough that its signal was stronger than your RFID transmitter's signal, AT THE RECEIVER.

There is a very long article on Wikipedia about RFID tags. Many frequencies were listed including UHF and microwaves but 58MHz was not mentioned.

wats the difference between this and a photo radar detector, the guys who made radar turned around and sold detectors, lets not forget speeding kills what, thousands, ten thousands per year? besides its not illegal unless you use at such, and any little clepto who want s to bypass this system, could probably do such with the equivalent of a couple ml's of salt water or an exacto-knife, or maybe even a speaker magnet on the tag

rfid receives a sig then trans a conf sig, as far as i know, I could think of 1000000 ways to bypass that,

what we should be looking at is a system that can triangulate, and pin point so security can actually watch it walk out the door or ping when it "falls off the grid"! Or customer service and shelvers can locate it easy, or can be told what to stock, just like those bar code readers @ walmart, they tell ya the price,,HOW CONVENIENT!!! , or what about products that kids pick up play with then leave laying around somewhere,

Hackers are a nuisance and will exploit all the fallacies of an engineers efforts, but we should still honor them since they encourage evolution, allowing us to evolve our systems.

antaean, if you problem is with the frequency then you just need to read up on LC circuits, bands and the RF properties of wires, also you may need to get a device or 2 and do some response tests, this is a project, and not illegal unless you use it
if you just want to clepto stuff, don't bother, stealing is illegal, and if you can hack this they would give you a job that pays more than you could fit in your pockets anyway.

i am just to dumb to figure it out. guess i should just give it up as a bad job. some guy made one and he charges 500 euros for the schematics and is from germany. if you did hack what? and why would they pay you more money than you could fill your pockets with.

I am not a clepto. There are far easier ways then messing around with electronics. that is not why i wanted to build one.
more to save 500euros from some shady german and to save my sanity because i had many many late nights trying to figure it out.

So before i go crazy i am just going to give up. its what i do best

im in the same boat as you but i wanna jam 8.2mhz -58mhz .could you tell me did you get anywhere? if you did build one i would like to buy a couple of you.