Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Hi all! We have been experiencing an issue on site where threads have been missing the latest postings. The platform host Vanilla are working on this issue. A workaround that has been used by some is to navigate back from 1 to 10+ pages to re-sync the thread and this will then show the latest posts. Thanks, Mike.
Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

Slinky spring HF antenna

  • 16-04-2022 9:46am
    #1
    martinedwards
    Registered Users, Registered Users 2 Posts: 2,043 ✭✭✭


    20220314_174052.jpg
    20220314_174116.jpg
    20220314_175952.jpg
    20220314_203649.jpg
    20220314_203745.jpg

    Always fancied a go at this....

    Basically, it's a random wire, end fed through a 4:1 balun.

    The random wire is three slinkies soldered together supported on a fibreglass fishing pole.



Comments

  • #2
    martinedwards
    Registered Users, Registered Users 2 Posts: 2,043 ✭✭✭martinedwards


    the bottom pics are the web SDR in Twente NL. http://websdr.ewi.utwente.nl:8901/

    sending from just north east of Belfast

    1st pic is the slinky

    2nd pic (with no signal!) is 20 seconds later using a commercial vertical.

    very temporary set up, just to test.

    Next test will be using para cord instead of the fishing pole for a horizontal installation.....



  • #3
    Ger Roe
    Registered Users, Registered Users 2 Posts: 2,145 ✭✭✭Ger Roe


    Cool design ... It reminded me of when the 300ft lattice tower mast on the Radio Caroline ship, Ross Rvenge, collapsed in 1987. They tried to replace it with a 135ft Carbon Fibre whip (manufactured by Valcom), that broke at the base, as soon as it was mounted on the deck. Despite being told that it would withstand being blown about on the north sea, it failed instantly.

    This video captures the moment that the original tower (tallest ever on a ship), came down in a heavy storm.

    https://www.rossrevengeplans.co.uk/About/Current/mast_collapse.html




  • #4
    martinedwards
    Registered Users, Registered Users 2 Posts: 2,043 ✭✭✭martinedwards


    Oh I'm not leaving this up where there is even the thought of a hint of a gust of wind!



  • #5
    martinedwards
    Registered Users, Registered Users 2 Posts: 2,043 ✭✭✭martinedwards





Advertisement