I have moved the data (WAV file and two JPGs) to my site now. They are now available at:
http://www.seti.net/html/SETINet/Archive/RA08/Canis%20Minor/Procyon/procyon.htm

Now for Hanks questions.

What does " Doppler that matches the earths rotation " mean? That the frequency drifts back and forth over a 24-hour period? Does the zero-Doppler point of the curve coincide with when the star is on the meridian? How much Doppler shift is there, does it vary as a sine wave? Could it be induced by the relative motion of the receiver as it rotates with the earth? Is the signal modulated

I am looking for narrow band, monotone, signals that are ET beacons sent to attract attention. Since there are many, many signals that are generated locally by my receiver, the cell phone tower down the street, the Navy base across town etc, I need a way to differentiate ETs beacon from all the others. For that I use the earth’s rotation.
I calculate the instantaneous Doppler that would be cause by earth’s rotation on an ET signal and I apply this to the receiver so that the receiver tunes down band in step with the earths rotation. The effect of this is that local signals, and signals from fixed satellites move up band but an ET signal remains centered.

I then create a Waterfall image of the band and since the receiver is chirping down band any ET signals show a straight up and down line. This is what happened today; a straight line appeared and tripped my alarm software. This has only happened a couple of times.

At that frequency you could be listening to 21 cm neutral hydrogen at 1428 MHz, Dopplered slightly by the sun's own motion through the galaxy relative to the source. Alpha Canis Minoris is in the Milky Way, only 12 degrees from the galactic equator, so there is a lot of neutral hydrogen around there, including several massive nebulae in nearby Canis Major and Monoceros

Yes its true that the hydrogen line is near to the frequency that I monitor but because of spreading the line is actually quite wide, much wider than the resolution of my spectrum analyzer so I have never seen it. I operate in the ‘waterhole’ between the hydrogen and hydroxyl lines.

What size reception lobe does your instrument have? Are you sure the signal is coming from a footprint that size within the vicinity of Procyon, or is it leakage from somewhere else? That close to the celestial equator, at dec = +5 degrees, you could be picking up a geostationary satellite (yes, they often transmit at frequencies reserved for astronomy). If this were the case, you would only get the signal continuously from one fixed spot, not from a moving target near Procyon.

Its very difficult to measure my antenna side lobes but I have attempted it using the GPS signals. You can see the results here:
http://www.seti.net/html/SETINet/Engineering/Engineering.htm
I think it’s about 4 degrees at the best point.
I track the star location automatically by adjusting the Az/El whenever the DEC/Ra moves outside of a 3 degree point so if the satellite and Procyon were lined up, I think this is the case today, I would see the satellite until Procyon moved out of that 3 degree point and I moved the antenna with it. If you look at the Sky Map on my web page you will see the size of that 3 degree point as a white circle. Since the Sky Map is a Mercator projection the size of the 3 degree point changes as I move to different parts of the sky.

Does the signal drop off if you move your antenna a few degrees away from that spot, does it do so asymettrically (indicating background emission from an extended source ) or quickly in any direction, (indicating a point source)?

I run the system at a rather high integration period to smooth out noise (about 20 seconds) and bring signals out of the mud. If I change the antenna position while running at a high integration period the signal ‘appears’ to linger longer than it actually does so when testing for off axis I change to a 2 second integration period. Then of course the signal goes back down into the mud so it’s difficult to determine how much change occurs. I make this test every time there is a hit and it’s the primary way to falsify a signal.

Enquiring minds want to know.

Great set of questions Hank. I hope I have given you something to chew on. I can supply more details if you would like – for example the exact Doppler in effect when the Hit occurred or how I managed to chirp my receiver by fractions of its tuning rate etc.
You can also see the exact engineering setup of the system (pointing angle, filter in use, spectrum size, times and a whole lot more) by using my SETI File Manager. Costs a couple of bucks but it goes for a good cause.
http://www.seti.net/html/SETINet/SETINet.htm#Purchase_the_SETI_Software:
Regards…….. Jim