2700km opening on 144 MHz in Australia - 20th Dec 2021

Monday 20th December 2021: The Great Australian Bight is the area of water just off the south coast of Australia and is well known for producing some fine tropospheric ducts. 

On what was the 21st of December in Australia, 144 MHz WSPR signals were exchanged by VK6NI and VK2KRR on a path that was just under 2700kms.

UTC (y-m-d)         TX         txGrid RX rxGrid         MHz         W SNR drift km
2021-12-20 21:02 VK2KRR QF34mr VK6NI OF85pa 144.490562 20 -18 0 2696
2021-12-20 21:26 VK2KRR QF34mr VK6NI OF85pa 144.490553 20 -22 0 2696
2021-12-20 21:42 VK2KRR QF34mr VK6NI OF85pa 144.490552 20 -25 0 2696
2021-12-20 21:48 VK2KRR QF34mr VK6NI OF85pa 144.490553 20 -19 0 2696
2021-12-20 20:58 VK6NI OF85pa VK2KRR QF34mr 144.490427 10 -18 0 2696
2021-12-20 21:18 VK6NI OF85pa VK2KRR QF34mr 144.490427 10 -20 0 2696
2021-12-20 21:38 VK6NI OF85pa VK2KRR QF34mr 144.490427 10 -7 0 2696
2021-12-20 22:22 VK6NI OF85pa VK2KRR QF34mr 144.490427 10 -24 0 2696

The tropo opening seems to have lasted about an hour.

There was also a 2000km tropo opening on 144 MHz between Australia and New Zealand on the same day.