Giving this more thought, I think I might be going about this the wrong way. From what I understand the coil will lose it's inductance qualities at SRF and this may be something I want to avoid considering that I want it to serve as an inductor in the xtal oscillating circuit. In RF design it's...
Thanks for the link Bob... I didn't consider that! The cable is almost 6 ft in length and at 1 GHz it looks like bout 1.3 attenuation. That's definitely accounting for a good sum of what I'm seeing. I'll try to pick up a much shorter cable today and see how much it improves.
SC, thanks for...
Well, I called it a "circuit" but there's no PCB or state of the art circuit involved. It basically consists of a custom air-core copper coil that's coupled to a xtal oscillator. I purchased the high frequency generator and scope specifically for tuning the small coil in the circuit after I came...
Thanks for the detailed response... that helps a ton! The generator has a type N connector and I decided to go with a small type N-to-BNC adapter and use standard BNC cables, but maybe that was a bad idea? I wasn't able to locate any type N cables w/ clips and so I just opted for that route but...
Thanks a ton for the help... I really appreciate that!
I connected the BNC cable to the scopes output and it's showing a clean square wave w/ freq = 500.005 kHz, Vrms = 289.3mV, Vp-p = 414.0 mV. I'm not noticing any significant signal variation when I wiggle the cables as you suggested, but...
I recently acquired an older Wavetek 2500 signal generator (.4 - 1100 MHz) and HP 54100A 1 GHz Digitizing scope for a project and am having a difficult time in getting an accurate voltage reading using anything other than a direct-connect BNC cable, and even that seems to have it's issues...
I think it's interesting to note that the 365.25 day duration of the julian year is exactly the average between the tropical Earth year and the sidereal year.
tropical Earth year = 365.24219879
sidereal year = 365.25636042
365.249279605 - 365.25636042 = 0.01416163/ 2 = 0.007080815 +...
"One wonders why the more accurate Gregorian year of 365.2425 days was not used instead."
My guess would be that it's taken on average (perhaps so as to have some form of a constant for mathematical calculations). Someone else more knowledgeable than I would likely know.
I may actually be able to help out some in regards to the traditional duration of a year based on the tropical year.
The orbital plane of the Earth's yearly rotation around the sun stands tilted at a 23° 26' (though not a constant) degree angle towards the Earth's equator. The projection of...
Does anyone have any insight on this? In the original data where I found this formula it states that "m = mass per unit length of beam (kg/m)". I take it that it's not referring to the mass density of the beam itself but rather the mass per unit length as described. If so then is this actually...
I came across this formula by Blevins for calculating the natural frequency of a hollow cylinder and was hoping that someone could answer a question I have for calculating the mass per unit length (m). Here's the formula:
f = A/(2*pi*L^2)*sqrt(E*I/m)
A= 9.87 for first mode
I = Area Moment of...
That was definitely it... it should have been cubed. Thank you! The other problem was due to an oversight in excel (trying to streamline some of these equations) which I wouldn't have caught without your help, so thank you for taking the time to look over this for me... I really appreciate it.
Hi and thanks again for the help AZ! I didn't realize that the formula was limited by the length/diameter ratio but I guess that I should have suspected. Do you happen to know if there is another formula that would be more suitable for my application? Or should I try using the 3d model...
Ok, thank you for all your help AZ... It 's most likely what you are saying I would think because I am using an CAD prgm and not a specialized FE prgrm and so that is likely the case here. But, I'll spend some more time working with it and see what I can find out. If I can track down the problem...