Around mid-last year VK5BUG's first multi-author volume, "MF Down Under" an edited VK-compendium of articles and projects for the 630 & 160m bands was released: 344 x A4 pages, nine chapters, 44 articles from 15 authors.
Now Doc is pleased to advise you that its sequel and companion text "Cellar-Dwellers on the go!" an edited international compendium of resources, articles & projects for portable and transportable operation on the LF & MF amateur bands, is currently with the printer & is scheduled for launch/release at the 2017 Wireless Institute of Australia AGM on 20 May in Hahndorf, South Australia.
Paul Nicholson wrote an excellent article explaining the fundamental principle behind forward error correction codes.
It does not discuss any particular coding scheme (Convolutional, Reed-Solomon, LDPC, and so on), rather, the intent is to home in on the underlying principle that all forward error correction schemes exploit. This is done so without using any mathematics at all, well perhaps just a little simple arithmetic.
On September15th Roger, VK4YB, and Steve, VE7SL, successfully completed a two-way JT9 QSO after a few previous attempts. With a distance of 11802 km, this QSO is believed to be the longest two-way QSO ever completed under amateur service rules on 630 meter.