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  1. #1
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    Antenna, bigger not better?

    Hi!
    I've recycled a super-high-quality antenna which was used for a really big outdoor wifi (2.4 ghz) coverage.
    Used hi-end coax cable and nice adapter (to N-MALE).
    Got all the stuff connected and.... poof.... ZERO ADS-B messages per second.
    Usually I get 100 nautical miles range with my finger-sized bundled antenna!! (from Nooelec).
    Photo of this big antenna attached (the cell phone gives you an idea of the scale).
    Any hints?
    Cheers,
    Francesco - T-LIRF54

    20181009_150828.jpg
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  2. #2
    Captain abcd567's Avatar
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    Seems connector mismatch (Connector on cable v/s connector on Nooelec Dongle).

    Nooelec has either SMA type OR MCX type connector.
    The antenna, designed and built for WiFi, has most likely RP-SMA connectors.

    Both the SMA and RP-SMA look and feel identical and fit with each other, but due to opposite center-pin configuration in RP-SMA, connection of center wire is broken.

    SMA vs RP-SMA.jpg

    EDIT:
    Please post close-up photos of:
    (1) Bundled Antenna showing its connector
    (2) Dongle showing its connector
    (3) The Dongle side connector on antenna cable
    Last edited by abcd567; 2018-10-09 at 15:02.

  3. #3
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    Thank you very much for the reply.
    But no! Connectors are fine as per attached photo

    2018-10-09 16.51.03.jpg
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  4. #4
    Captain abcd567's Avatar
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    OK, the antenna end N-to-SMA and Cable end SMA are both matching type, so there does not seem to be a problem at the antenna end provided Antenna also has a matching connector to the N-to-SMA adaptor in photo.

    How are the connectors on Nooelec Dongle AND dongle end of Cable? You did not post any photo.

  5. #5
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    Here there are:

    Dongle (from the website):

    nesdr_smart_1_1_1.jpg

    Cable:

    2018-10-09 17.09.07.jpg

    Antenna (w/adapter):

    2018-10-09 17.08.11.jpg

    Thanks a lot,
    Francesco
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  6. #6
    Captain abcd567's Avatar
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    Adaptors all look OK.
    Now one of the following two things are causing the problem
    (1) Antenna
    (2) Cable

    You can easily check cable by disconnecting cable from WiFi antenna and connecting it to the thumb antenna. If Cable is OK, you will start receiving. In this case, the antenna has a problem. Go ahead and check the cable as above.

  7. #7
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    Good point!
    But the thumb antenna has the far end termination "molded" in the antenna stand! There's no way to bypass it (photo).

    20181009_175208.jpg
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  8. #8
    Captain abcd567's Avatar
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    F-EGLF1
    You are right, a WiFi 2.4 GHz antenna will be hopeless on 1.090 GHz, but still it will not give ZERO reception.

    Cauchee has mentioned in his first post ZERO reception, which gives a doubt about short circuit or open circuit either in cable or antenna.

    Any way it is NOT worth fixing a short/open problem, as the WiFi 2.4 GHz antenna will give a hopeless reception on 1090 MHz even after fixing the defect.
    Last edited by abcd567; 2018-10-09 at 17:36.

  9. #9
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    Quote Originally Posted by abcd567 View Post
    F-EGLF1
    You are right, a WiFi 2.4 GHz antenna will be hopeless on 1.090 GHz, but still it will not give ZERO reception.

    Cauchee has mentioned in his first post ZERO reception, which gives a doubt about short circuit or open circuit either in cable or antenna.
    As we don’t know the specifics of that antenna it is possible it has built in bandpass filters (especially if as he said it came from a high spec setup) if he is in an area with a low number of close aircraft then it is quite possible that he sees nothing, but I agree that he still should see the odd one or 2, however it would perform significantly worse than a random length of wire!
    FR24 F-EGLF1, Blitzortung station 878, OGN Aldersht2, PilotAware PWAldersht, PlanePlotter M7.

  10. #10
    Captain abcd567's Avatar
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    I use Flightaware antenna.
    It gives me good performance for the Price. In North America (USA & Canada) Shipping is free, but It may be substantial for Europe.

    https://www.amazon.it/dp/B00WZL6WPO

    https://www.amazon.co.uk/dp/B00WZL6WPO

    https://www.amazon.com/dp/B00WZL6WPO

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