Juno

Juno was launched on August the 5th 2011 from Cape Canaveral, Florida. It's cruise to Jupiter will take several years, with the space craft not arriving there until July 2016.

The Juno spacecraft carries both X-Band and Ka-Band telecommunications packages. It has an array of antennas, including a high gain antenna, a pair of low gain antennas and a toroidal antenna. This is to ensure that at JOI the spacecraft's main 2.5m diameter HGA can point at Jupiter, but still allowing X-Band telemetry to be transceived with the DSN network on Earth.

Juno was first received at UHF-Satcom on August the 6th 2011 at 07:33z on a downlink frequency of 8403.979MHz. The FFT of the initial signal is displayed below;

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The receiver used to process the signal and examine the FFT shown above is the excellent RF-Space Net-SDR. Audio analysis of the received signal shows the Doppler shift caused by the space-craft spin;

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Signal received from Juno on the 7th October 2013:

JunoHGAJunodiagram

The images above show the location of the various X-Band and Ka-Band antennas on Juno. (Images credit: NASA/JPL-Caltech/LMSS)

The FFT Image gallery below shows some of the signals received from Juno over the years.