Topband: operation from 5U

[Caputo Alfeo]

I received a number of reply that I resume as follow:

Frequencies 1810-20-30 to be avoid because birdies in the USA, 1827 not
usable in EA6, 1818 not usable in West Coast.
Recommended frequency are 1816-17, 1821-29, 1833; better +0,5 kHz 
Best time is 2 hours before to 0,5-1 hours after 5U sunrise, recommended to
look for West Coast when propagation to USA is open. Same for Scandinavia
when we are working Europe. Recommended time for VK6 is 21,00-22,00Z
Recommended wide split, 5 - 10 khz.

Thanks to all of you for reply and suggestion, we will do our best.

Any suggestion about  80 CW&SSB frequency?

Best 73, Alfeo