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Liveatc EIDW feeder needs better antenna

Comments

  • Registered Users, Registered Users 2 Posts: 507 ✭✭✭...__...


    vhf quad would be ideal you could build one yourself for a few euro.
    but the commercial airband antennas would be your best bet
    http://www.wsplc.com/acatalog/Airband_antennas.html


  • Registered Users, Registered Users 2 Posts: 507 ✭✭✭...__...


    by the way thank you for feeding not often you get to thank the person who provides the service.


  • Registered Users, Registered Users 2 Posts: 177 ✭✭brownmini


    Mech1 wrote: »
    Advise needed, I have already posted here http://www.boards.ie/vbulletin/showthread.php?t=2056967147

    So I dont wanna double post if its not allowed.

    Thanks,
    Pat

    Suggest a J-pole cut for the centre frequency of the frequencies you are interested in (within reason- the J-pole is not a broadband aerial)
    Easier to mount.
    Stronger.
    Less bits to catch wind in a storm
    Can be home-made.
    Measurements at: http://www.hamuniverse.com/jpole.html

    73


    follow-up at 2120 11th june 2013

    If you enter the words below into google - you'll get a lorry load of pictures
    of what a J-pole looks like and many of them are homemade one so you'll get
    the idea on how to tackle your own version.
    The words are . . . . . . . . pictures of j-pole antenna


    But remember, that the measurements given in most of these pictures
    will be for 144MHZ and not 122 MHZ so use the calculator at
    http://www.hamuniverse.com/jpole.html
    to calculate the dimensions for 122MHZ or where you want.
    At 122MHZ - the aerial will be bigger than one for 144MHZ.

    73


  • Registered Users, Registered Users 2 Posts: 5,124 ✭✭✭Mech1


    I gave up on the "home build antenna", not enough spare time.
    Today I ordered a D-777 antenna from Martin Lynch & sons in the uk.
    Anything I should be aware of when installing? I see people are making coax loops, some type of choke idea?
    Do i need to do this if im not transmitting?
    Should I run a ground lead to the antenna?
    Amplifier?
    pl259 to rg213, What size (wattage) soldering iron needed to do it right? Previously I have had problems with the connector plastic melting before the solder runs.

    Replacing this http://i962.photobucket.com/albums/ae101/mech1111/IMG_0517.jpg Discone plus another 1.5M higher mounting pole.

    All tips welcome, click on my sig link to hear it now, Static messing with 121.100 Approach especially.

    Thanks.

    ps. Watty I know your the Antenna expert from reading your posts on here over the years. I would love it if you could listen to the feed and comment before and after D-777 instalation.


  • Registered Users, Registered Users 2 Posts: 1,729 ✭✭✭martinsvi


    Coax chokes are to avoid RF current getting back to the rig. Since you're not going to be transmitting, you don't need that.
    Ground (earth) lead is a good idea in case if there are no lightning rods or tall trees close by. You don't want to invite a fire hazard at your home. If there is a good lightning rod (conductor) close, you can live without.

    I wouldn't use an amp - since the feed is good already, you will just invite more interference and static, I think..


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  • Registered Users, Registered Users 2 Posts: 5,124 ✭✭✭Mech1


    martinsvi wrote: »
    Coax chokes are to avoid RF current getting back to the rig. Since you're not going to be transmitting, you don't need that.
    Ground (earth) lead is a good idea in case if there are no lightning rods or tall trees close by. You don't want to invite a fire hazard at your home. If there is a good lightning rod (conductor) close, you can live without.

    I wouldn't use an amp - since the feed is good already, you will just invite more interference and static, I think..

    Thanks, why do you think the "static" is present more on 121.100 than other close freq that are crystal clear?

    I'm hoping that its the "broad spectrum design" of the Discone thats picking up interference around that freq and that the d-777 will be immune.


  • Registered Users, Registered Users 2 Posts: 1,729 ✭✭✭martinsvi


    I can only speculate, but if I remember correctly, static is even present next to airport. Maybe they use an antenna with a slightly different radiation angle or maybe they are directional, as all approach patterns are predefined..


  • Registered Users, Registered Users 2 Posts: 5,124 ✭✭✭Mech1


    yeah I thought the problem must be on their side, cutbacks and such I suppose:D


  • Registered Users, Registered Users 2 Posts: 5,124 ✭✭✭Mech1


    Up and running on the D-777 antenna now, big improvement.

    http://http://www.liveatc.net/search/?icao=eidw


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