Category Archives: RF

How long will the rain last?

Want to know how long the rain is going to last? Simple- pop out to the shed and build yourself a weather satellite antenna from the bits that you can find. [OK – there may be easier ways of finding out, but this looks far more fun!]


Circling above your head the US National Oceanic and Atmospheric Administration have satellites constantly broadcasting back data and pictures using APT on ~137MHz. There is nothing to stop you receiving these images yourself and, like Simon, you can build a ‘quadrifilar helicoidal’ antenna with some plumbing supplies and the help of this great online calculator.

Connected to the antenna were an RTL-SDR dongle and a computer running gpredict to track the satellite, gqrx to handle reception, and wxtoimg to do the APT image decoding.

Next up? Let’s add a SatNOGS ground station to roof of rLab!

Horniman Museum and Gardens Hackathon

On Saturday 21st September after months of planning and support we finally pulled the day off, about 30 Hackers turned up and I think we achieved some 3 months work in a single day! We’ll have a more official update soon but here’s some pics to get started!

Huge thanks to everyone involved and for making it a great day!