There was a design in the ARRL's technical journal years ago. I've thought about trying it, but decided I'd enjoy the challenge if someone else was paying for my mistakes, but not if I were paying fo
I'd look at the manual. This does not make much sense to me, and I have quite a good understanding of transmission lines. The instrument is either faulty, or the manufacturer has decided to give you
Well here's I done it in Mathematica http://www.wolfram.com/ for you. f=1/(2 * pi * sqrt(l c) ) In[4]:= 1 / (2 * Pi Sqrt[ 2 10^-6 2500 10^-12]) You might not follow the formatting, as I doubt it will
If anyone is serious about making antenna impedance measurements you might want to consider getting a used HP vector voltmeter (make sure it has the probes). With a coupler, and some attention to cal
I've not used the Boonton 250A, and would suggest anyone looking at buying any of these professional instruments did a bit of research first. Perhaps buy a manual before the kit - you can always sell
Although you calibrate such systems with open and short circuit loads, both of which have an infinite VSWR. My guess is that the software in modern VNAs can take this into account, but I might well b
Something I have done professionally is to use a lock-in amplifier. These are usually used for extracting small signals from the noise. Some of the better instruments can measure signals that are 100
There's some (not much) info in this document http://www.g8wrb.org/data/Econco/tube-topics.pdf about it. Chapter 6 of the Eimac book 'Care and Feeding of Power Grid Tubes' http://www.cpii.com/eimac/c
I don't think that is a bad choice (I think it was me who oringallly suggested it, so I've got to say that). I would start by getting the manual - there must be dealers with them. That will give you
No problems. Seems a lot to me - see below. I don't know if that follows, as there is a well known relationship between energy, termpature rise and mass. Energy = mass x specific heat capacity x T wh
Here's some, which I downloaded from the Thales web site. http://www.g8wrb.org/data/Thales/ You can download them youself from the Thales site and probably more, but they don't make it easy, as you h
Which is what you want for a good coolant!! You want a small amount of the liquid to be able to absorb a lot of heat, with the minimum change in temperature. However, I think water has one of the hig
I mentioned some time back in a sentence or two of another way of measuring R+jX, so I thought I'd elaborate a bit. Here is a commercial lock-in amplifier http://www.thinksrs.com/products/SR844.htm w
Yes, pdf's are cross platform, which is a very good thing indeed. There is free software to read pdf's and to write them too (Ghostscript, being one probably many examples). Personally it is not a bo
Don't forget the thryatron - that will work at power levels that semiconductors would have no hope of coping with. -- Dr. David Kirkby, G8WRB Please check out http://www.g8wrb.org/ of if you live in
I assume you mean Ctotal is 14.8pF, giving a reactance of 74 Ohms. Anyway, forget the numbers - a general formula is better. I assume the tube is at one end of a line, and the other end is a high imp
Does a detergent not wet water more, by reducing surface tension? Not that I think it makes the slightest difference, but then some people by magnets to put on their fues lines to give them 20% bette
HTML is a bad choice for technical books (which I assume your transformer book would be), as how the image is displayed is determined partially by the HTML content, but partially by the browser. Equa
Oh, even more reason to avoid. I suspect that is not true. I bet more pdfs come from Word. How do people get HTML - most use an editor of some form, although I tend to write the HTML codes directly.
I see this advice given out a lot, but unless I am mistaken it is flawed. Microwave ovens work by emitting energy at a frequency (I believe around 2.4GHz) where there is a water absorption peak (due