Historic first Trans-Atlantic contact made on 432 MHz - Tues 7th April 2020 1

On
Tuesday the 7th of April 2020, a remarkable contact was made on the FT8 digital mode on 432 MHz between D4VHF on the Cape Verde Islands off the coast of Africa and FG8OJ in Guadeloupe in the Caribbean.

This was the first 70cms trans-Atlantic contact without using satellites or the moon. The most likely mode of propagation was marine ducting with the signal being trapped close to the ocean.

This is a screen shot showing the FT8 contact which was approximately 3,867 kms in length.

Historic first Trans-Atlantic contact made on 432 MHz - Tues 7th April 2020 2

For the historic UHF contact, FG8OJ was using 100 watts from an ICOM IC-9700 into an 18-element Yagi antenna.

Historic first Trans-Atlantic contact made on 432 MHz - Tues 7th April 2020 3

According to the tropo forecast by Pascal, F5LEN, the conditions across the Atlantic were really good…

Historic first Trans-Atlantic contact made on 432 MHz - Tues 7th April 2020 4

It’s interesting to note that the 432 MHz signal from Cape Verde was first heard by 9Y4D in Trinidad on Monday the 6th of April 2020 at 18:48 UTC but no contact was made.

Historic first Trans-Atlantic contact made on 432 MHz - Tues 7th April 2020 5

The distance from D4VHF to 9Y4D is even further at 4,006 kms.

Historic first Trans-Atlantic contact made on 432 MHz - Tues 7th April 2020 6

432 MHz…

8th Apr 2020
Rcvr Band Mode Distance Time (UTC)
9Y4D 70cm FT8 4006 km 18:31:14
9Y4D 70cm FT8 4006 km 13:23:14


7th apr 2020
Rcvr Band Mode Distance Time (UTC)
FG8OJ 70cm FT8 3867 km 23:35:14

Ongoing…

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