Posts Tagged ‘u3’

QRP Labs Ultimate 3

Some months ago I was planning an afternoon at our local Fab Lab, partly to help raise their profile and partly to introduce some club members to the easy to use laser cutting services they have. We designed an profiled a case for the QRP Labs Ultimate 3 WSPR transmitter.

It occurred to me that I haven’t really shared the experience having been enjoying myself at the 24 du Mans race, celebrating my parents 50th wedding anniversary and having a birthday. None the less, its time for a catch up.

The U3 is a fairly simple build, in its basic form takes about and hour and a half to build and test. Start adding the various extras like a switchable band pass filter (for 5 bands!) and a gps unit and the time to build, well builds up. The kit isn’t complex and doesn’t use smd’s (although I’ve never understood the fear of them – whilst my eyes are still ok) and there’s only 4 coils to wind for the basic version.

The biggest issue was how to box it up. After trying various configurations we settled on a very simple front and back panel design, Others, like the desktop version or ones with castellated fixings either looked a bit cheesy or were hard to put together and prone to breaking. A simple 2d CAD sketch is loaded onto the machine, plonk in the materials and you’re away. It couldn’t be simpler. Anyway here’s the semi finished product. I need to do something about the spacers as they look awful but its nearly there.

 

U3 small


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