This page only partly written.
The basic propagation mode for radio signals at VHF and UHF is usually called:
Tropo - short for tropospheric propagation.
Various mechanisms exist by which these Tropo signals may become enhanced, sometimes enabling them to propagate more than 2000km. The most important of these enhanced modes at VHF and UHF are:
Sporadic E
Meteor Scatter (including shower info)
Auroral Scatter
We would welcome explicit contributions on each of these modes, to include on this website.
Sound clips of VHF and UHF radio contacts are available in various places,
mostly on personal websites.
We would be happy to provide links to any appropriate sites.
Many sound clips are processed into Real Audio files in order to limit file size, and require a reasonably up-to-date Real Audio Player.
VK2FG's voice was recorded in Esperance by VK6AOM . VK2FG is now licensed as
VK2IUI.
This contact set a new VK2 record which was broken a few minutes later when
VK2ZRU also worked VK6AOM, a distance of 2697.9km; that record still stands in
2002.
For those interested here is a copy of the synoptic
chart for the day. Note the High pressure area in the Bight with a ridge
extending to Sydney. The direct path between Esperance and Sydney passes
somewhat to one side of the centre of the High, as is usual with long distance
ducting.
John VK2FG/VK2IUI has written a personal reminiscence of that day; this first
appeared in Ragchew, the newsletter of the Blue Mountains ARC in December 2002.
Click below
to read or download John's description:
VK2FG's description of the VK2FG-VK6AOM contact.
We would also like have some sound clips of the various relevant digital modes, so that we may learn to recognize their sound!
