Recent content by Baluncore

  1. Baluncore

    High School Another dumb SocMed quiz

    Apparently birds warm their feet on bare wires. Maybe their bodies are actually being dielectrically heated by the AC field near the wire. Don't forget the importance of wavelength. Get a grip on it. The short parallel vertical stubs on BBC shortwave broadcast antennas, were the legs of birds...
  2. Baluncore

    Small Hopper and Silo Design for Green Coffee

    Many others have been through the design and testing process before you. There are commercial products that you could learn from. Expect a minimum wall slope of 60°, with a 4" opening. If you are not into maths, or have imperfect data, identify the important factors for your hopper application...
  3. Baluncore

    -6dB loss phemonena in differential pair signaling

    There is history, but no pictures available in previous threads. Some posts are like quicksand, the more you struggle, the sooner you drown in the delusion of engineering. Yes, but they will usually return with another question, probably in another thread, in a couple of days. I have found the...
  4. Baluncore

    -6dB loss phemonena in differential pair signaling

    With much closer tracks, above a ground plane, it would form a backward wave coupler, but the tracks are not close coupled, they are widely separated, and remain parallel. I suspect the OP is testing a 100Ω parallel differential transmission line, formed from two parallel 50Ω tracks, each...
  5. Baluncore

    -6dB loss phemonena in differential pair signaling

    Based on so little solid information, you really cannot expect us to guess, but you don't answer questions, so here goes ... I assume there is a ground plane below the tracks. You have a balanced line between 1 and 3, with an unbalanced line between 2 and 4. Since 2 is faulty, I assume it is...
  6. Baluncore

    Material property comparison based on TDR and delta L

    Without context, I can tell nothing.
  7. Baluncore

    Material property comparison based on TDR and delta L

    From the top right corner of your plot, how do you know the impedance of materials A-E? Were they calculated or were they measured using some instrument? You should be able to either, identify the Er was used for their computation, or extract Er from the TDR measurement. In your case, with a...
  8. Baluncore

    Interpreting TDR properly

    I see no ringing in the plot. If the window you refer to is before the FFT, used for the VNA to TDR processing, then it appears not to be needed. I don't know how you connect to your line, but it seems to be with a 98Ω line from the analyser. Your line being tested has an impedance of 83Ω. Does...
  9. Baluncore

    High School Cold fusion

    The field is now called "Low Energy Nuclear Reactions", LENR. Transmutations of element nuclei do occur during the process, but there is no significant energy generated. It will not break the economy, but it will reveal useful science in time. It is difficult to tell what is happening with...
  10. Baluncore

    High School Long rod in orbit

    It would increase its backward spin gradually over time. If you started it instead, with a forward rotation having a period greater than one month, then that rotation would gradually slow to a one-month period, when it would finally become tidally locked, showing only one side to the Earth...
  11. Baluncore

    High School Long rod in orbit

    It may seem counterintuitive, but the further end would orbit at a lower speed, while the lower end would orbit at a higher speed. That is because the lower orbit requires a higher speed to counter the greater gravitational attraction. That means a vertical rod would start to rotate backwards...
  12. Baluncore

    Undergrad Chua's oscillator circuit -- Intuitive picture

    https://en.wikipedia.org/wiki/Simulation_hypothesis It talks about reality, which includes chaos. You did not even read the reference to the "simulation hypothesis" that began ... "The simulation hypothesis proposes that what one experiences as the real world is actually a simulated reality...
  13. Baluncore

    Undergrad Chua's oscillator circuit -- Intuitive picture

    https://en.wikipedia.org/wiki/Simulation_hypothesis
  14. Baluncore

    High School Long rod in orbit

    How long is the rod? Is the rod straight or curved? When it was placed in orbit, was it rotating once every month, so it always remains parallel with the Earth's surface, or was it aligned with a fixed star?
  15. Baluncore

    Undergrad Chua's oscillator circuit -- Intuitive picture

    It should be possible with SPICE to plot the sum of all energy circulating or stored in L or C. Ea = ½⋅L1⋅I(L1)² ; Eb = ½⋅C2⋅V(C2)² ; Ec = ½⋅C1⋅V(C1)² For some reason that does not seem to work. I get a minimum energy sum on the saddle. Maybe zero potential is relative to the local attractor...