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TNC jack limits

Discussion in 'Electronic Design' started by Jamie, May 19, 2013.

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  1. Jamie

    Jamie Guest

    Looking to select a common coax plug and jack to use, i am leaning
    towards the TNC style.

    Most specs I've found do not give an extra cut of freq for low
    reflection effects.

    Was looking at the APC 7 line, but I think that is just a little
    to expensive for what ai have in mind, plus its operation is far more
    than I need.

    Will the TNC connector operate up to 3GHz with no problem?

    Jamie
     
  2. Jeroen

    Jeroen Guest

    I suppose that depends on your definition of 'problem'.
    What are the requirements? Give us some numbers!

    (The simple observation that you compared TNC to APC7 is
    funny in itself. These aren't at all in the same league!)

    Jeroen Belleman
     
  3. Jamie

    Jamie Guest

    Yes I know that, but I was in the shopping around mood..

    There will be no transmission line between connector and device,
    in other words, there will be a jack on the panel and a hand held
    device that will have the other mating plug. This device is light weight.

    The problem arises with the frequency that is passing through the
    connector.

    I have a set of APC 7's and I know those will work fine, however, I am
    at home and doing this for one of my own little R&D projects and all I
    have here is a 2GHZ source, which seems to work fine with a TNC
    connector, but I am interested in 3Ghz.

    I also have some sma connectors with PTFE, but ideally I want a
    male panel mount with a knurled fitting. A quick look does not
    reveal much in that line, all nuts. Maybe they are concerned with the
    seating of these things. Which is one reason why I was dropping back
    a bit.

    Jamie
     
  4. Guest

    BNC are OK for test leads with frequent connect/disconnect cycles at
    frequencies below 1 GHz, however, after several connect/disconnect
    cycles, the shield connection tends to be quite reliable.
    The TNCs have a reliable shield connection even after several
    connect/disconnect cycles.

    The question of N vs. BNC/TNC vs. SMA/SMB also has to do with power
    levels (mW/kW) and how thick coaxial cables you intend to use.
     
  5. Jamie

    Jamie Guest

    Well you see that is the problem, anything over 2 Ghz, it depends on
    the dielectric material, the one's I have use PTFE.

    But the short of it is, there will be no transmission line, it'll be a
    miniature device with a male panel mount connector hanging off the female
    connector on the main panel. There will be a small amount of DC in there
    to power the external device.

    Jamie
     
  6. Jasen Betts

    Jasen Betts Guest

    RP-TNC is used for wifi antennas, so TNC should work ok.
     
  7. Jamie

    Jamie Guest

    Thanks, I put a TNC Male and female together today and did a test on the
    equipment at work, it looked good at 3ghz, but just as I got to ~ 3.4Ghz
    I started to see changes.. So it's borderline but seems to be ok for
    what I have in mind..

    Thanks.

    Jamie
     
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