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    what did i do wrong?

    i tried to make three signal/radio frequency/radiation detector (please tell me if there are any differences between the three since i dont really know what i am doing), but none of them worked. what did i do wrong? is it me? is it the diode? the capacitor? the transistor? the coil? all of the above (i hope not)?

    https://youtu.be/5hu_6P1CMxI

    in this one, i read in some of the comments that it is fake or does my coil need to be a 24 awg?

    https://youtu.be/vHVmJ5lD9jc

    in this one, i suspect that my diode was not what it was meant to be which is why i made this thread:

    https://www.badcaps.net/forum/showthread.php?t=88828

    https://youtu.be/dTmlQKvVVEk

    in this one, my buzzer rings the moment i stick the red wire into the middle pin. i suspect that my transistor & diode are both not as what they were advertised, if so then can someone please share & paste a link of a trusted seller in here on where i can buy legit transistors & diodes that i need for all these?

    i will truly appreciate any sort of advice & or help that i could possibly get in here.

    thank you very much
    Last edited by ivanew; 09-22-2020, 02:47 PM. Reason: replaced 'topic' with thread

    #2
    Re: what did i do wrong?

    The capacitor just mucks with the low frequency gain of the circuit, but does not do anything about the high frequency. The antenna design is the sole contributor to the RF gain as there's no RF amplifiers.

    1. The gauge of the wire does matter to an extent, especially the higher frequencies.
    2. The sensitivity of these things are very low as demonstrated. Inverse square law...
    3. Mobile phones are all sorts of different bands, you'll need to tailor your antenna to your specific band.

    For proof of concept doing the GMRS/FRS one would probably be good to see if the idea works as that's on a fixed frequency. The ISM 2.4GHz one if you have a microwave oven nearby could work, remember it still needs to be quite close. If you got your ham license you're welcome to try the ham bands of course.

    All in all, do not expect high sensitivity with any of these, even the one with the IC.

    Comment


      #3
      Re: what did i do wrong?

      do you have any suggestions for a legitimate signal/rf/radiation detector? i mean, an already built one that i can buy? maybe i can start from there and try to strip it & maybe figure out which is which

      Comment


        #4
        Re: what did i do wrong?

        You need to specify which band for starters.

        Getting a spectrum analyzer is the end all, but I'm pretty sure you don't want to strip it and analyze such as I'm not sure what you can do to duplicate it without actually duplicating its complexity... and you still may need to get one that is sensitive in the band you want.

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          #5
          Re: what did i do wrong?

          first off, thank you so much for replying, i really appreciate it. any other alternatives aside from a spectrum analyzer? something handheld, something similar that can be used for counter surveillance? i sincerely apologize for taking some of your precious time. again, thank you so much for helping out

          Comment


            #6
            Re: what did i do wrong?

            what are you actually trying to do - the end goal?
            because if your hunting for transmitters, you can use a $15 SDR radio dongle with a USB-OTG adapter and an android phone/tablet to scan a huge range.

            Comment


              #7
              Re: what did i do wrong?

              Originally posted by stj View Post
              what are you actually trying to do - the end goal?
              because if your hunting for transmitters, you can use a $15 SDR radio dongle with a USB-OTG adapter and an android phone/tablet to scan a huge range.
              my end goal will be the following:

              1. try to get some legitimate 1ss86 diodes
              2. try to detect/locate the signals of pet microchips which are:125 kHz, 128 kHz, 134.2 kHz
              3. at least try to detect the signal/frequency/bandwidth of any cellphone which from what i read are the following:
              https://en.m.wikipedia.org/wiki/GSM_frequency_bands
              https://en.m.wikipedia.org/wiki/UMTS_frequency_bands
              https://en.m.wikipedia.org/wiki/LTE_frequency_bands
              https://en.m.wikipedia.org/wiki/5G_NR_frequency_bands
              4. detect microwave signals/frequency
              https://en.m.wikipedia.org/wiki/Microwave
              5. or better yet, if possible? all of the above

              but how? & a spectrum analyzer is really expensive for me, any other alternatives? or tutorials on how i can build things that can detect the signals/frequencies of those that were mentioned?

              Comment


                #8
                Re: what did i do wrong?

                I use this adafruit 1497: Digikey 1528-1524-ND. and sdr-sharp software on a PC, there is also other sdr software that works well.
                Last edited by R_J; 09-23-2020, 10:29 AM.

                Comment


                  #9
                  Re: what did i do wrong?

                  Originally posted by R_J View Post
                  I use this adafruit 1497: Digikey 1528-1524-ND. and sdr-sharp software on a PC, there is also other sdr software that works well.
                  thank you. i will give it a try, but do you have any suggestion for something hand held? something that can be used for counter surveillance? e.g. sweeping hidden cameras, etc?

                  Comment


                    #10
                    Re: what did i do wrong?

                    As much paranoia is around, this won't do much for a wired camera...

                    Comment


                      #11
                      Re: what did i do wrong?

                      Originally posted by ivanew View Post
                      my end goal will be the following:

                      1. try to get some legitimate 1ss86 diodes
                      2. try to detect/locate the signals of pet microchips which are:125 kHz, 128 kHz, 134.2 kHz
                      3. at least try to detect the signal/frequency/bandwidth of any cellphone which from what i read are the following:
                      https://en.m.wikipedia.org/wiki/GSM_frequency_bands
                      https://en.m.wikipedia.org/wiki/UMTS_frequency_bands
                      https://en.m.wikipedia.org/wiki/LTE_frequency_bands
                      https://en.m.wikipedia.org/wiki/5G_NR_frequency_bands
                      4. detect microwave signals/frequency
                      https://en.m.wikipedia.org/wiki/Microwave
                      5. or better yet, if possible? all of the above
                      not happening.
                      1: maybe
                      2: no chance, those rfid chips only transmit in short bursts when you put a coil over them and energise them with an ac magnetic field.
                      you can get modules from china for the task though.
                      3: your talking about very high frequency's - 2.4>5GHz or much higher for 5g

                      Comment


                        #12
                        Re: what did i do wrong?

                        Originally posted by eccerr0r View Post
                        As much paranoia is around, this won't do much for a wired camera...
                        yes, but wired cameras are way more easier to spot with the naked eye than wireless ones, unless there are now wired cams that are as deceitful as its wireless counterparts.

                        Originally posted by stj View Post
                        you can get modules from china for the task though.
                        may i please have links? thank you so much

                        Comment


                          #13
                          Re: what did i do wrong?

                          https://www.aliexpress.com/wholesale...xt=rfid+module

                          Comment


                            #14
                            Re: what did i do wrong?

                            i appreciate the help, but i watched some tutorials on youtube & if i am not mistaken these things are for building badges/id's to allow entry of a personnel, unless there are other tutorials out there that i missed then i would love to see them, either that or i am much more in deeper trouble for being a total beginner in regards with these things so if there are links of these rf modules sweeping signals/frequencies/radiation then i would most definitely be more grateful than i already am. thank you all so much for trying to help me, i am sincerely hoping that with the continuous help of everyone here i will finally find a solution regarding this silly problem of mine.

                            as i was browsing i found this:

                            https://youtu.be/Id68OFLSuzg

                            as you all already maybe aware i am a complete total beginner regarding these matter so i only tried simpler tutorial guides, if there are anything that is more simple than this complex one (for me) that is almost close to the first 3 vids that i posted then if there are any more words of gratitude on my very limited vocabulary then i will use it, but really - thank you guys so much for the help, they truly mean a lot.

                            Comment


                              #15
                              Re: what did i do wrong?

                              the modules dont sweep, they function on specific frequency's

                              but you first need to understand the chips.
                              they are just tiny memory chips with a capacitor and transciever combined.
                              the field coil on the module charges the capacitor and allows you to read or write to the memory chip - that's all they are.

                              now what you store on them is up to you, your AMIBO data(nintendo characters), your dog's id code, or your credit for a cashcard. and also car immobilisers.

                              in the case of cash or travel passes they use more expensive chips that need a password to write to them and use encryption.(MYFARE) but the principle is the same.
                              car immobilisers are differernt, they transmit a rolling code based on a secret key - but that's not an issue.

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