Radio Australia Special Event or would you like to try a 20db HF antanna?

Discussion in 'Contests, DXpeditions and Special Events' started by VK3ZYZ, Feb 11, 2020.

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  1. VK3ZYZ

    VK3ZYZ Ham Member QRZ Page

    UPDATE:
    The 50 to 300 Ohm BALUNs have been installed and tested ready for the event.
    All the antennas that we are planing to make available for use have been disconnected from the switch and wired to a BALUN.

    BALUN_1 copy.jpg

    BALUN_2 copy.jpg

    These BALUNs work pretty well.

    Here is the test setup....
    There are 2 x 50:300 ohm BALUNs in series to give 50:50 ohms. The Codan 8525A is the test source.
    upload_2020-3-2_16-28-58.png


    Starting temp plus a few mins, = 27.4C

    upload_2020-3-2_16-30-59.png
    VSWR is pretty good!


    upload_2020-3-2_16-33-19.png
    Around 70W in, and 65W out. This is via the 2 BALUNs in series.
    32.2C after 20 mins carrier.
    (Note the "IRWIN" brand tune button operator :)
    It was easier than holding a finger on the button!


    Construction info is here...
    https://ra.sadarc.org/#!/baluns
    An addition not shown in the construction article is the Earth connection that each BALUN now has to make sure all the antennas are safely tied down for static protection.
    My legs are sore from being on the ladder for long periods of time!
     
    UR5GAW likes this.
  2. VK3ZYZ

    VK3ZYZ Ham Member QRZ Page

    Just a bit over 2 days to go!
    This is all starting at ....
    00:00:00 Saturday March 14, 2020 in Australia/Victoria
    13:00:00 Friday March 13, 2020 in GMT

    There will be streaming audio of the contacts available (if everything works ok) so folks will be able to listen in on line.
    Just keep checking the web site for updates.
    https://ra.sadarc.org/#!/

    http://www.sadarc.org/ has a few historical photos.
     
  3. WN1MB

    WN1MB XML Subscriber QRZ Page

    Roger those wee hours!

    I remember sitting in the basement shack tuning in my prized Collins R-392 for Radio Australia for the first time. And just above the noise floor I could hear "Waltzing Matilda." It was a very, very special time, place, and event. Save Alzheimer's or other dementia, it's a memory I'll long cherish.
     
    K5VZD and WW2PT like this.
  4. VK3ZYZ

    VK3ZYZ Ham Member QRZ Page

    It is just after 8PM on Friday night here and I'm home for a quick bite then back to RA.
    At this time some test transmissions are being made to make sure the antenna switching and power supplies etc. are all working.
    Keep a listen out on all HF bands as it is up to the individuals where and what mode they use.
    Just under 4 hours to go al I hope it all works!
     
  5. VK3ZYZ

    VK3ZYZ Ham Member QRZ Page

    It is now just after 2AM Sat 14th here.
    And I have had my first overseas contact, Mike, WA3O on 7.162 (I think it was) and it turns out my transceiver was only outputting 25W or there abouts.
    Then a contact with Bob, KE0AHKM and another with Perry, KG7YC on 7.670.
    Thanks fellows!

    Details of my set are here... http://www.sadarc.org/Projects/Hawk 102-12.pdf
    It was purchased from a junk store for $30 and an Arduino driving an Si5351 "vfo" was added.
    It is pretty amazing what a 17db gain antenna can do!
    I am off to bed. It has been a huge day.
     
  6. N1NA

    N1NA Ham Member QRZ Page

    I was stationed in Vietnam (Danang, at the time) and revolved our shifts to a DF hut. This was in 1962 and no Armed Forces Radio. VOA played music from my parent's generation, but tuned in Radio Australia and kept us up to date with the latest music from OZ and the UK. It was really great on my Zenith Transoceanic
    radio. It was a huge sanity and morale booster for us. Had to move north to Phu Bai and my CO was a major in the Royal Australian Regiment (SAS) - they treated us geek yanks great, as long we could keep up with the Fosters, sing "Waltzing Matilda" and "Charlotte the Harlot".
    They and loved it when we pulled in Radio Australia on my radio. Those guys would end the "shift" at 8 AM, after doing "stuff" we were not privy to, but not "gentle" all night. I Love Australians, except when the grabbed the Americas Cup in Newport, RI. (My XYLs home)
     
    VK3ZYZ and WN1MB like this.
  7. VK3ZYZ

    VK3ZYZ Ham Member QRZ Page

    It all went off pretty well. Thanks all for participating.
    The setup has been packed away and there is just the BALUNs to remove now. We did not want to remove them at night, so will take them down in a couple of days.
    Now I have extreme antenna envy!
     

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