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  • wiedehopf
    replied
    Consider upgrading to an blue FA prostick+ or green AirNav Flightstick as well.
    Independent of the antenna, those will improve reception.

    A spider antenna on the roof with some RG6 or other quality coax that isn't too long, combined with a filtered / amplified receiver should give you 200 nmi of range if the surrounding terrain or houses don't block your view of the horizon.

    In short: the spider antenna outside with clear view and proper coax will outperform any antenna that is indoors.
    But if you are limited to having an antenna indoors, the FA antenna is one of the best antennas for that purpose.
    (just realize that you reception is limited when the antenna is indoors)

    Leave a comment:


  • petercr
    replied
    +1 for the FA antenna. Home-made is good for starting out or if $ are tight.

    Leave a comment:


  • abcd567
    replied
    I have not used the Jetvision "SCO-1090-MCX" antenna, but have used a home made Spider and the Flightaware 1090 antenna. Although the Spider is very good and simple home made antenna, the Flightaware antenna performs better than it.

    The reason is simple:
    Spider is a 1/4 wavelength antenna with ground plane. Such antennas have gain around 2 dBi. Commercial antennas like Flightaware and Jetvision have gain of thw order of 5 to 6 dBi, hence perform better.
    Last edited by abcd567; 2020-02-10, 09:20.

    Leave a comment:


  • utack
    replied
    Hi,

    can someone talk about the Jetvision "SCO-1090-MCX" vs a self made spider.
    Currently getting a max of 60nm with the indoor antenna, and I wondered if we are talking about roughly same performance for the spider and the pro antenna or if is really amazing and worth its 70€.

    Thank you!

    Leave a comment:


  • abcd567
    replied
    Originally posted by magnum View Post
    There is potentially too much noise around you. Having an LNA with this range increases also the noise where then the ADS-B signals are hidden behind it.
    Reducing gain can help a bit, but a filter optimized to 1090 Mhz would be better

    Do I need a Filter? - Find RF Signals In Area


    .

    Leave a comment:


  • magnum
    replied
    Originally posted by matysldn View Post
    Has any of you used this LNA? range from 0.1 to 2000 MHz sounds great. I just instaled it but I can see a sudden drop from eg. 100 planes to only 30 and messages from 400 to almost 0. Ive tried with different power supply from 5v to 12v and doesn't make any difference. Any thoughts?

    [ATTACH=CONFIG]11215[/ATTACH]
    There is potentially too much noise around you. Having an LNA with this range increases also the noise where then the ADS-B signals are hidden behind it.
    Reducing gain can help a bit, but a filter optimized to 1090 Mhz would be better

    Leave a comment:


  • wiedehopf
    replied
    There is a reason they built a triple-filtered LNA for ADS-B: https://www.rtl-sdr.com/new-product-...mhz-ads-b-lna/

    The reason is: broadband amplifiers don't work well for ADS-B unless you have your own filters to go with it and even then the above product i likely superior.

    Leave a comment:


  • abcd567
    replied
    Too much gain can also cause this. Reduce gain of dump1090 to 20 dB and see if it improves.

    Leave a comment:


  • petercr
    replied
    Amplification range is too broad and if you have any local interference (eg local GSM towers) it will more than likely make the situation worse. Dropping plane count and messages that low seems to suggest that maybe the amplifier itself is faulty or there's a bad connector on the pcb (it can happen).

    Leave a comment:


  • matysldn
    replied
    Has any of you used this LNA? range from 0.1 to 2000 MHz sounds great. I just instaled it but I can see a sudden drop from eg. 100 planes to only 30 and messages from 400 to almost 0. Ive tried with different power supply from 5v to 12v and doesn't make any difference. Any thoughts?

    LNA.jpg

    Leave a comment:


  • abcd567
    replied
    Dark blue (1090 mhz) will remove both GSM800 and GSM900

    https://discussions.flightaware.com/...s-filter/45287

    .

    Leave a comment:


  • IZ8292SWL
    replied
    Originally posted by abcd567 View Post
    I cannot read frequencies on your scan (scan image too small on my phone).
    If the interfereing signal is around 900 ~950 Mhz, then you have to use FA's dark blue one. (1090 mhz only). The light blue one (978+1090) will not remove 900~950 mhz interference
    I have both interference from 800 and 900 mhz!

    Leave a comment:


  • abcd567
    replied
    I cannot read frequencies on your scan (scan image too small on my phone).
    If the interfereing signal is around 900 ~950 Mhz, then you have to use FA's dark blue one. (1090 mhz only). The light blue one (978+1090) will not remove 900~950 mhz interference

    Leave a comment:


  • IZ8292SWL
    replied
    Yes, i suppose....
    Pretty strong GSM signal isn't it?
    Do you think that the Flightaware filter will do the trick?

    Leave a comment:


  • abcd567
    replied
    Originally posted by IZ8292SWL View Post
    So this afternoon i ran the test that i found in a Flightaware forum post

    You dont have to go to flightaware to find this how-to. I have posted the how-to in both Flightaware and Flightradar24 forums

    Do I need a Filter? - Find RF Signals In Area



    Originally posted by IZ8292SWL View Post

    and those are the results:
    [ATTACH=CONFIG]11197[/ATTACH]

    This test is coming from another USB stick that currently is in a box on the roof.
    I left it there in order to analyze this situation...

    I'm using the Flightaware PRO stick.
    Alone it can't stop all the QRM coming from the GSM cell towers.

    I suppose i have to buy a filter in order to use my antenna on the roof!!
    What do you think?
    GSM800.jpg

    GSM900.jpg.

    You have cell interference in both GSM800 and GSM900.
    Even if you use flightaware blue stick, the filter in it is after the LNA, so the filter will save the tuner from overload by these signals, but LNA will still get overloaded. You may need another filter between antenna and flightaware blue stick.
    Last edited by abcd567; 2019-10-17, 21:50.

    Leave a comment:

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