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Thread: Hong Kong Radar

  1. #121
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    Quote Originally Posted by North Borneo Radar View Post
    Hmmm... might sound a bit too optimistic/unreal but maybe hope some generous member here will sponsor you a beast? As you have contributed much to the Rpi Dongle project?
    I'd prefer to purchase at an attractive price

    ... and I don't mean the radarcape ... I mean the older one that I can connect to the Pi.

  2. #122
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    I just made another antenna (5.5 coco) and moved from facing SW to NE to cover the east terminal area.
    Now I see traffic starting at around FISHA.
    My coverage even extends up to Xiamen (266 nm)!!
    Attachment 4201Attachment 4202Capture3.PNG
    However due to terrain (Ma On Shan and Tate's Cairn) there are quite a few blind spots.
    This proves that line of sight is very important for ads-b.
    I used the second design with 5 elements for the stem: http://forum.flightradar24.com/threa...ntenna/page122

  3. #123
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    Sorry fixed the above attachments.
    Capture.PNGCapture2.PNG

  4. #124
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    Quote Originally Posted by microtony View Post
    Sorry fixed the above attachments.
    Capture.PNGCapture2.PNG
    WOW that's great, your new coverage can replace my coverage in CUHK location which has been terminated a few days before.
    And I just know I had a hostel offer in the coming September, but I don't know whether my view of hostel is the same like facing EAST - Ma On Shan. If the coverage is good, I will request an DIY antenna from you at that moment!

    For Coverage Display, you can use the latest Virtual Radar Server which Coverage Function is implemented and coloured, let me show my coverage did 2 weeks ago for example,

    T-VHHH19:
    T-VHHH19_c.jpgT-VHHH19_b.jpg

    T-VHHH28:
    T-VHHH28_c.jpgT-VHHH28_b.jpg

    The coloured layer is divided by different height coverage, like FL 00-99, 100-199, 200-299, 300 above
    And microtony, your most update VHHK FR24 Plugin cannot support high resolution (1920X1080) which make the map in all black tiles.
    未命名.jpg
    Last edited by Dundee; 2014-06-04 at 14:41.
    T-VHST9: http://vhst9.hopto.org/
    (24/7)

  5. #125
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    Quote Originally Posted by microtony View Post
    Nice to meet you samman.
    Do you think you can cover the ABBEY area? As you can see there are a lot of position jumps.
    Attachment 4200
    What antenna are you using? May be I can make you one.
    Quote Originally Posted by North Borneo Radar View Post
    Maybe you can ask microtony to make you one.. and then you can see whether your range improves samman.
    Quote Originally Posted by Dundee View Post
    Using DIY or adsb based (1.1GHz) atenna will have a great inprovement!
    Attached the radar range diagram. Unfortunately there are several skyscrapers just in front of my window, and I guess the ABBEY hold falls into the gap between IFC and Four Seasons Hotel. Improving reception may help (considering there can be diffraction around edges of those buildings?)

    VHHH41_range.jpg
    T-VHHH41 @ Central District, HK
    180 degree facing East-South East, 650 feets above sea level

  6. #126
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    You have better coverage over the east arrival route than me.
    I guess with a better antenna you can get the full range (up to 250nm).
    A 3.5 element coco is 51cm long and a 5.5 element coco is 72cm.
    Which one do you prefer? (I just bought some coaxial cables yesterday from Ap Liu Street XD)

  7. #127
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    Quote Originally Posted by microtony View Post
    You have better coverage over the east arrival route than me.
    I guess with a better antenna you can get the full range (up to 250nm).
    A 3.5 element coco is 51cm long and a 5.5 element coco is 72cm.
    Which one do you prefer? (I just bought some coaxial cables yesterday from Ap Liu Street XD)
    If you are kind enough to offer me the cable that'd be great! Actually I tried to make a pair of coco yesterday using old TV cables (75ohm) but I don't have the connector (MCX type). I just connected the central wire to the usb stick and the result was unsatisfactory. Or maybe I may have wrongly made short circuits lol?

    I looked for MCX connectors in Ap Liu Street without success. I may look for one from Taobao
    T-VHHH41 @ Central District, HK
    180 degree facing East-South East, 650 feets above sea level

  8. #128
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    Quote Originally Posted by samman View Post
    If you are kind enough to offer me the cable that'd be great! Actually I tried to make a pair of coco yesterday using old TV cables (75ohm) but I don't have the connector (MCX type). I just connected the central wire to the usb stick and the result was unsatisfactory. Or maybe I may have wrongly made short circuits lol?

    I looked for MCX connectors in Ap Liu Street without success. I may look for one from Taobao
    Often you will get a small whip antenna with the dongle. To make an adaptor, cut the wire half way and fit a TV coaxial socket to MCX end of it, then you just need a coaxial plug on the other part if you want to connect it again.

    It will look a little like this


  9. #129
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    peterhr: the adapter is only RMB $3 on taobao, so it's not worth the effort to make one
    samman: There is one shop in Ap Liu Street selling the adapter but the price is HK$19.
    Luckily I have one extra and I can give it to you along with the antenna.

  10. #130
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    I forgot to add.. I also used an amplifier... the amplifier is powered by USB

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