Paul Colby's latest activity
-
Paul Colby reacted to Andy Resnick's post in the thread I Can somebody explain this: Planck's Law in action with
Like.
Yes, but the amount of energy radiated by the wire will be much lower than the sun. The amount of energy you need to absorb to protect... -
That is very sad. He was smart as hell and funny with it. I was on the end of his caustic wit a few times, as I am sure many posters...
-
Paul Colby reacted to marcusl's post in the thread A Project Progress Report and possible Radio Astronomy Technique? with Like.
There's no R in the formula for power, only for the voltage generated by a resistance. A resistor delivers a power spectral density S=kT...
-
Paul Colby replied to the thread A Project Progress Report and possible Radio Astronomy Technique?.Yeah, starting from scratch with enough competence to actually do the design work is definitely the way to go. Also, cooling everything...
-
Paul Colby replied to the thread A Project Progress Report and possible Radio Astronomy Technique?.This is a good question. I’ve done some experimenting separating the radios and shortening the cables from the clock generator. I’ve...
-
Paul Colby replied to the thread A Project Progress Report and possible Radio Astronomy Technique?.The total Johnson noise per Hz is ##4k_BTR##. For a perfectly matched network, only ##k_BTR## of it gets into the receiver. In this case...
-
Paul Colby posted the thread A Project Progress Report and possible Radio Astronomy Technique? in Astronomy and Astrophysics.Some 8 years ago I posted some experiments using 2 Software Defined Radios slaved to a common clock. The idea was measure small thermal...
-
Paul Colby replied to the thread I Linear generator prototype.I finally viewed the movie clip in post #15. It’s difficult to tell the magnet orientation from the video. I now understand and agree...
-
The actual pole pattern of the individual magnets is essential to this analysis and discussion. It would be helpful if the poles of the...
-
Paul Colby replied to the thread I Linear generator prototype.For a normal bar magnet magnetized along its long dimension, yes. However, I suspect the north (or south) pole of the magnet shown in...
-
Paul Colby replied to the thread I Linear generator prototype.Moving the magnet he has on the outside of the coil might also increase the voltage generated. Putting a magnetic metal core through the...
-
Paul Colby replied to the thread I Linear generator prototype.The magnets of the type shown are common in both in variable reluctance motors and in linear motors. Invariably the magnetization vector...
-
Paul Colby replied to the thread Electromagnet magnetic field issue.Magnetic field lines are closed loops. The field generated (and the corresponding forces resulting) depend on the path reluctance of...
-
Paul Colby reacted to Baluncore's post in the thread I How feasible is home radio astronomy? with Like.
You are free to select your transform size. For one project, I was monitoring the background noise floor across the HF band from 1 MHz...
-
Paul Colby replied to the thread I How feasible is home radio astronomy?.Well, being serious about doing science and being interested in learning how things work by doing them really aren’t the same. I had...