Foundations of Amateur Radio- Episode 120

Discussion in 'Amateur Radio News' started by VK6FLAB, Sep 23, 2017.

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  1. VK6FLAB

    VK6FLAB Ham Member QRZ Page

    Tropospheric Ducting Explained

    You've always been taught that VHF communications are line of sight and that the height of your antenna determines how far your 2m communication might go. So if I tell you that last week I spoke with a station that was 300 kilometres away on the 2m band you might be forgiven in thinking that I had managed to climb up most of the side of Mount Everest to around 7 kilometres so I could make my line-of-sight communications 300 kilometres away.

    This week we find out how that works using a phenomenon called "Tropospheric Ducting".

    Foundations of Amateur Radio is a weekly podcast about the wonderful hobby of Amateur or Ham radio. You can catch it on-air, on-line or on-demand. Check out iTunes by searching for my callsign VK6FLAB for your personal copy, or visit the website at

    Onno VK6FLAB
    AE1JB, NU4R and EB3EWQ like this.
  2. K3FHP

    K3FHP XML Subscriber QRZ Page

    OH, DUCTING, I know how THT works, I WS wandering though hat 'Tropospheric Dusting' was. I am disappointed not to find out.
    AF7EC, WA8MEA, KZ3J and 10 others like this.
  3. AK5B

    AK5B Ham Member QRZ Page

    Tropospheric dusting is sometimes done with special high-altitude crop dusters spreading a heady blend of Magic Pixie Dust, Mixes 43, 61 and 72 ferrite dust , super-ionized ground meteorite powder and charged carbon particles when it appears that a tropo duct is about to form.

    It is basically a very expensive way to enhance propagation on the VHF bands that some of us gung-ho VHF/UHF DXers will resort to in order to grab a few more elusive grids or DXCC awards. Until now it has been kept under wraps (for fear that the ARRL might invalidate such "artificial" propagation enhancements for contest, award or DXCC credit).

    I believe that it came about in the 1990s after a meeting of several big gun hams, Boeing, Richard Branson and Spacex all decided to collaborate on the first fleet of "X-115 Tropo Dusters" in secrecy.
    Last edited: Sep 23, 2017
    NV4B, AC3DB, K2NED and 6 others like this.
  4. AA5BE

    AA5BE XML Subscriber QRZ Page

    Well siad! That is what you get for depending on spellcheck.
    K7BOA likes this.
  5. WB8VLC

    WB8VLC Ham Member QRZ Page

    I wonder if there are French Maid's who are well versed in Tropo dusting?
    KC8KBK likes this.
  6. WB2JIX

    WB2JIX Ham Member QRZ Page

    I think it's crop dusting from a very high altitude.
  7. K3LI

    K3LI Premium Subscriber QRZ Page

    Super secret Tropospheric Dusting plane. Please do not look at this classified picture. You can tell how large it is by looking at the 40 foot long blue truck parked next to it in preparation for loading.

    Notice the Di-pole antennas. Half out each side to the wings. Looks to have 8 of them.

    Attached Files:

    KB9GNB likes this.
  8. W0AAT

    W0AAT XML Subscriber QRZ Page

    300km is my daily range with no ducting... heck I can hear the WD9BGA/b that is 50 watts to a stacked pair of loops at 301 miles most any day of the week! If the signal strength is down a bit band conditions are down. If it is a solid S2-3 band conditions are normal, above S3 we have some enhancement...
  9. AK5B

    AK5B Ham Member QRZ Page

    And this is what you get for not proofreading before hitting the POST REPLY tab.:p
  10. AK5B

    AK5B Ham Member QRZ Page

    The only French maids that were ever well versed in such esoteric matters were the few that flew on the Concorde...most of the time they had other priorities, though.

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