Preliminary Data Sets Published
 
It has been concluded that we do not significant evidence of a Hydrogen spike from the Deep Impact collision with 9P
September 15, 2005

The first data set is taken from the SpectraCyber I gas spectrometer working at the Hydrogen frequency of 1420.406 MHz +/- 100 KHz with an integration time of .5 seconds. RF bandwidth is 5 KHz. With 50x DC gain and zooming this is near the highest resolution of the spectrometer. Check main page for Receiving System details.

This complete data set shows several interesting signals, one of which is bannered in the movie. The data begins at  5:21:14 UTC and ends at 6:13:56 UTC.

Data movie rolls approximately 150 seconds. Movie frames are produced directly out of the SpectraCyber software. Click refresh to re-start it.

This second data sample is taken from the Yaesu VR-5000 on the left channel and the Yaesu FT857D on the right audio  track. The 5000 is sitting on the predicted doppler shift signal of 1420.361 MHz and the FT-857D is sitting on the 5000's IF of 10.7, sweeping 10.6 to 10.8 MHz. The modes are CW in both. The rf bandwith of the 5000 is 5 KHz and the FT-857D is 1 KHz with an audio filter of 240 Hz... and AGC OFF.

The two spectrogram channels are processed with SpectraPRO using an FFT size of 2048, 10 sample linear averaging, a Hanning smoothing window, and a spectral line resolution of 4 Hz.

Check main page for Receiving System details.

The data set shows several interesting signals at the same time reference of the signal under investigation on the SpectraCyber at  6:06:00 UTC. Since the right channel is sweeping, the signals have to be broadband.
This third data set is from a custom configured 1420 MHz Downconverter developed by Carl Lyster [designer of the SpectraCyber I gas spectrometer]  feeding an HP 141T/8552B Spectrum Analyzer. A sample sweep is shown below of the complete data set. The HP is sweeping 1 Megahertz centered on 1420.406. The rf bandwidth was 100 Hz, the video integration was .1 second, and the sweep time was 5 seconds. We have over 1100 sweeps. We use DigiSpectrum software [developed here] to capture the HP data and drop the sweeps to movie frames.  More details coming.

Back to Deep Impact- JSS