I have been expreimenting with Radio Astronomy observing the hydrogen line using conical feedhorns using both gnuradio and sdrangel software. In the SDR angel software there is the star tracker which has 'heat' maps of the Milky way one of which is recorded at 480MHz. So I thought it would be interesting to see what 408MHz looks like locally, obviously its pretty busy. So using a V antenna (two concertina areial at 120 degree angle) going into a Noolec broadband amplifier feeding an Airspy R2 with 10 MHz bandwidth and sample rate I have been looking at 10 Mhz regions < 410 MHz. I have noticed that there is a signal which in the morning moves to lower frequency numbers and then around 2 pm starts to move back up to high frequency numbers. I have observerd, and continue to observe this signal over several days. I was wondering whether it was something to do with the sun, as by around 2 pm the sun is due south where the antenna is roughly pointing (at and angle of 40 - 50 degrees elevation). In the attachment you can see two examples of the peak of interest at 13:30 and 15:00 where the signal has moved frequency. At the end of the attachment is an excel plot of the data over several days, is some of the plot the signal went out of the observing frequnecy range, but overal you can see it is repetetive but perhaps the signal is moving slowly to high frequencies. As I say I though it might be the sun, and it was the doppler effect I was observing. It has been suggested that this might be a satellite and that I should lok for modulation in the signal. That is something I will try to do on Friday when I can get to the observatory.

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Can anyone help identify what it is I am observing here?