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TxID Transmitter FingerPrinter

Discussion in 'Ham Radio Discussions' started by KC9JIQ, Jul 8, 2007.

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  1. KC9JIQ

    KC9JIQ QRZ Member QRZ Page

    Anyone out there has this, seems cool, could you use this on your radio, like for example have your fingerprint in there, and only your finger print will key up the repeater, or prevent certain individuals from using your equipment.

    Eham has no reviews, but this seems very interesting for a particular use that I cannot say here. [​IMG]
  2. N5FOG

    N5FOG Ham Member QRZ Page

    The transmitter finger printer has nothing to do with limiting access to your radio or human fingerprints.

    Every radio's transmitted signal is somewhat differnt from others in very minor ways from its deviation,spurious emissions and other characteristics that are measurable/visible on a spectrum analyzer.

    What a transmitter finger printer does is it allows the user to save the "fingerprint" of known transmitters/stations to a database and when an unknown station is causing problems it can search the database to see if that fingerprint matches a known station.

    There was a group of hams down here in Houston that used one to quickly identify who was jamming a local repeater back in the mid-90's.

  3. VA3SAX

    VA3SAX Ham Member QRZ Page

    I was going to say it would be good for interference complaints...also might be useful if you stored the data from your transmitters...that way if they were stolen and fenced you'd know who had it...course it's not their fault if they didn't know that the seller didn't buy the rig
  4. N5PVL

    N5PVL Ham Member QRZ Page

    Does it work for HF too?
  5. N4AUD

    N4AUD Ham Member QRZ Page

    At $800 a pop, it will go on the long list of "things I'll just have to live without."
  6. KA5PIU

    KA5PIU Guest


    At $800 is is something you have the police buy and than borrow, like what was done in Houston.
    The cellular carriers also use this along with most military.
    Nothing new, just expensive.
  7. N5PVL

    N5PVL Ham Member QRZ Page

    There has been some free soundcard software around for this, for a very long time. It was one of the earlier soundcard-related ham radio programs. If I remember correctly it was a DOS program I played with years ago, but there may be later versions for Windows.

    I'd look around for a software solution before I coughed up 800 bux, no doubt.
  8. K5OKC

    K5OKC Ham Member QRZ Page

    It is designed for FM radios with a raw discriminator output, or a modified rig with the discriminator brought out to a jack.

    AM and SSB don't have all the markers that FM does.

    It's just audio, so a soundcard could be used to sample and display the output.  Basically you want to capture and expand the first couple of hundred milliseconds as the rig keys-up.  That's the only part that is different between rigs. 16 bits should be enough dynamic range to capture everything.
  9. NE5H

    NE5H Ham Member QRZ Page


    When an offender and his transmitter is identified, and you request FCC enforcement action, and an offender takes you to task or to Civil Court, does one have to qualify equipment as being "certified/calibrated/accepted" by the FCC, Courts, etc.? And, must the operator receiving and recording the electronic fingerprint be "certified" as an expert in any way, or, by the courts, in order for the electronic fingerprint to be introduced into a FCC Enforcement Hearing or Court of Law as evidence? Does the offender have legal recourse against you in a Hearing or Court of Law should you fail to prove your case? I don't know, I'm just asking the "what ifs".
  10. K8MHZ

    K8MHZ Ham Member QRZ Page

    I have used Audacity to do basically the same thing. It's sure easier to rule out a signal than match one, though.

    It's also easier to do on simplex than through a repeater.
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