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Thread: best antenna

  1. #2611
    Captain abcd567's Avatar
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    Quote Originally Posted by majo View Post
    ...........
    Do you have an idea or simple way to detect and quantify RF noise at a given location?
    There is no easy way to find RF noise except by using costly test equipment.

    Best option is to buy an Orange ProStick and an external Filter.

    First set the gain at 38 dB, and try Orange ProStick alone. Next at same gain setting add the external Filter and try again.

    Compare the two results. It will give you an indication if adding a filter is benefitial or not.

    After finding which is better (with or without filter) adopt that setup. Now set gain at 49.6 dB, then drop down in steps of 3 dB and watching where you get maximum message rate. Generally people get best between 30 dB and 45 dB.

  2. #2612
    Flight attendant majo's Avatar
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    @abcd567:
    Thank you!
    According to your advice I just changed the gain setting. Let`s wait and see...
    BTW: Are the FA-Sticks more stable concerning the ppm-value than the ordinary DVBT-sticks or is it worth to do a x-check with sdr for possible adjustment?

  3. #2613
    Captain abcd567's Avatar
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    @majo
    I never bothered about ppm value of any type of stick. Always left ppm at its default setting whatever it was.

  4. #2614
    Flight attendant majo's Avatar
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    @abcd567
    That is interesting!

    And what is your experience concerning gain: Figure out best setting for actual environment or use auto gain (-10)?

  5. #2615
    Captain abcd567's Avatar
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    @majo
    What is best varies greatly with location. Try all possibilities.

  6. #2616
    Captain abcd567's Avatar
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    I want to purchase a low cost instrument for swr /impedance/frequency sweep of 1090 mhz DIY antennas.
    I am considering to buy this one for $184 + free shipping. Has anyone tried it?

    New 140MHz~2.7GHz UV RF Vector Impedance ANT SWR Antenna Analyzer Meter Tester





    Operating Frequency :140MHz ~ 2700MHz
    Frequency Step :1kHz
    monitor dispaly :2.4-inch TFT Resolution 320 × 240 (QVGA)
    battery capacity: 2000mAH (7.4Wh)
    Power consumption : <1.5W
    Charge Current: 400mA
    Charging Interface: USB (only temporarily as the charging interface, data transmission not yet open)
    Automatic shut-down( You can set open, 5 minutes to 60 minutes Optional)
    Measurement parameters:
    impedance : 0.1Ω ~ 1000Ω (impedance absolute value)
    SWR: 1.000 to 65
    s11 (dB): 0dB ~ -60dB
    Resolution
    impedance : <Impedance absolute value × 3% ± 0.1Ω (Z less than 200Ω, <1.5GHz)
    SWR : <Valid reading × 10% ± 0.1
    s11(DB / °): 0.1 dB / 5 ° (0dB ~ -10dB)
    1 dB / 10 ° (-10dB ~ -20dB)
    5dB / 20 ° (-20dB ~ -40dB)
    Directionality :<35dB (140MHz ~ 2GHz after calibration), <30dB (2GHz ~ 2.7GHz)
    Scan Points: 280
    Output Level: -18dBm
    Operating temperature: 0 ℃ ~ 40 ℃

  7. #2617
    Passenger
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    I went out and bought a ads 1090mhz antenna from flight aware. $55 what a difference even just inside my window four floors up. This will be going on the roof shortly 7 floors up. I will be testing out cables for best reception. Jimm

  8. #2618
    Captain abcd567's Avatar
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    @ShoeGolf
    After you finish fixing your antenna on roof, you may need an amplifier if coax is too long.

    You can try Flightaware ProStick Plus (Blue) which has a built-in amplifier and built-in filter. In most cases, the built-in filter is enough and an external filter is not required. However, if the RF noise at your location is strong, you may need an external filter also.

  9. #2619
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    at present I am running the prostick plus the coax run will be 30ft which I will be switching to will be Rg6 geared for 1 to 2ghz the

  10. #2620
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    Quote Originally Posted by ShoeGolf View Post
    at present I am running the prostick plus the coax run will be 30ft which I will be switching to will be Rg6 geared for 1 to 2ghz the
    RG6 attenuation is 6.7 dB / 100 ft (22 dB / 100 meters).
    For 30 ft, attenuation will be about 2 dB.
    The gain of ProStick Plus built-in amplifier is, I think, 15 dB, which can easily cover the coax attenuation.

    One of the North Atlantic Track passes over/near Helifax. You will be seeing lot of air traffic to/from Europe
    Last edited by abcd567; 2017-01-01 at 02:13.

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