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Thread: TxID Transmitter FingerPrinter

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  1. #1
    Join Date
    May 2006
    Location
    South Eastern Illinois Oilfields
    Posts
    1,818

    Default

    http://209.51.151.50/TransmitterID.html

    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.



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  2. #2
    Join Date
    Jan 2000
    Location
    Bayou Vista, TX
    Posts
    984

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    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.


    FOG



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  3. #3

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    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. #4

    Post

    Does it work for HF too?



    [IMG]http://i239.photobucket.com/albums/ff206/arwatch/aaa%20web%20stuff/smileys/popcorn.gif[/IMG]73 DE Charles, N5PVL

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  5. #5
    Join Date
    Sep 2004
    Location
    Wise, Virginia
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    4,309

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    At $800 a pop, it will go on the long list of "things I'll just have to live without."
    Audie
    SKCC #927
    Virginia Fone Net #72

  6. #6
    Join Date
    Sep 2005
    Location
    Houston TX/Yanbu KSA
    Posts
    4,613

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    Hello.

    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. #7

    Post

    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.
    [IMG]http://i239.photobucket.com/albums/ff206/arwatch/aaa%20web%20stuff/smileys/popcorn.gif[/IMG]73 DE Charles, N5PVL

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  8. #8
    Join Date
    Jan 2000
    Location
    Oklahoma City
    Posts
    989

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    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. #9

    Default TRANSMITTER FINGERPRINT ID

    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. #10
    Join Date
    Nov 2004
    Location
    Western Michigan. Great summers but nasty winters.
    Posts
    15,583

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    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.
    73
    Mark, K8MHZ

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