Recent content by Helmholtzerton

I'm trying to understand how I can mathematically describe a particular situation in order to calculate what I should expect to read on an oscilloscope. Let's say I have a signal generator that is generating a 1MHz sinusoidal signal 1Vpp. The source impedance of the signal generator is 50ohm...

Thank you for taking the time to reply. Ahh. I don't have mine with me right now, but if I'm understanding you correctly, you're saying this device can just be used to shift the phase 180 degrees when terminating the other output? I'm a little confused by the spice model. I thought I should...

Yes, it is incorrect. It is a 1:2 BALUN: https://www.minicircuits.com/pdfs/ADT2-1T.pdf Also, with that Balun, the primaries and secondaries are electrically isolated from one another. While on the 180 Hybrid, each of the 6 ports I tested are not electrically isolated from one another.

Thanks for the reply Dave. Then I think the specific 2:1 balun transformer I have, and the 180 hybrid coupler - they are functionally the same thing, as all of the ports are at 50ohm. Considering when going from a 50ohm coax to 100ohm twisted pair on the balun transformer, each line of the...

Is there a big difference between these two devices? It appears a signal can be applied to one port of a balun, which will generate two signals 180 degrees out of phase with respect to each other on two of the other ports of the device. The results can be achieved with a 180 hybrid coupler...

Hey, if you would like, this is how I solve for off axis fields of a current loop using elliptical integrals. This is done in python. """ Created on Fri Oct 26 13:52:32 2018 @author: Nate Z """ from pylab import * from scipy.special import * # Calculates Bz and Br converted back to...

Thanks for the reply Charles, There was an error in my code. I have achieved symmetry.

Hello, I'm wondering if my approach to a problem is correct as when I try to simulate the DC magnetic field of a current loop using elliptical integrals, I obtain results that appear incorrect when shifting the current loop's location from the origin of the z axis. I have attached the...

Sorry, what I was trying to convey is for all sin functions that comprise of f(x). That is... Say you have the following f(x) = sin(t) + 3sin(2t+pi/4) Then the constant of integration to subtract off would be = cos(0)+ 3/2cos(pi/4) = 1+1.0607 = 2.0607 the anti derivative of f(x) = -cos(t) -...

Hello, I'm trying to integrate a signal received on an oscilliscope, but I'm afraid using the function cumtrapz is not giving me the correct value. Here is what I'm seeing when testing out sine functions I could apply an FFt to obtain the components and the phases, and then subtract off the...

At around 2 Torr is when I'm able to start to break down air into plasma. - but with that high of a pressure, fluctuations haven't been a problem with a simple hand value to control pressure. When I am in the mili Torr region, say 10mTorr, it is much easier to see swings in pressure without...

Well, now I know what can be done with the center taps, and that is very useful. As for canceling harmonics. This could possibly pose problems Here what I have seen using simple Bdot probes... and these frequencies are supposed to be there according to theory. Excited frequencies f1 = 200...

The plasma changes the impedance of your system. It can act as a capacitor or an inductor. What kind of antenna are you using to generate the plasma? Inductive, capacitive? Some inductive type antennas have three plasma modes which can exist - E,L,H - depending on the power used and how well...

All the connections where made, however the op amp could not handle much of an offset. Then when I hooked up in dual mode the op amp operated as expected when applying a large offset on one signal.

My baluns came in. Here are the results. Seems good except for when I apply an offset. Not sure why it behaves the way it does with the offset. In phase, 1Vpp applied to each signal going into the balun. Output no signal. Exactly what we should expect. 1Vpp 180 out of phase between the two...