UK to Australia with a Pi-TX
For some weeks now the prototype Pi-TX transmitter board has been sitting on an early Pi model B with a 30m Tiny-LPF plugged into it, sending out WSPR packets to the world through an attic dipole. Spots from Europe are very common, and from the eastern USA come most days. Then early in the morning UK time on the 11th of March came a spot from VK3XQ, just north of Melbourne and 16940KM from the G7CKF QTH in Oxfordshire.
So we've proved that 150mW into a modest antenna can traverse the world. Our next step will be to try it with 10mW direct from the Pi, but that will be another story.