I just finished a series of comparison tests of a handful of polymeric materials and blends, for use in high power VHF amplifier projects. I didn't test Nylon, Delrin acetal, Polyethylene or Polyprop
An interesting set of results. Is there a zero missing on the row "PTFE+Glass 84 98 20 205 goodmechanical" since it simplies the current started at 20 mA and rose to 205 mA, when I expect you mean 20
Minor correction - you used diameter of the puck instead of the radius when calculating the area. C = 2.1 * 0.2248 * (1.5/2)^2 * pi / 0.75 = 1.11 pF Xc = 1593 I = 10607/1593 = 6.66 Arms -- Jeff WN3A
Jeff, Whoops! You are are correct and thanks for finding the error. That makes the current amplitute discrepancy 4 times less but the calculated current is still 32 times the reported current. Will w
David, you are correct, should be 200 mA for the starting plate current for that column. I have used a 3D printed plastic part as an air shroud around the screen contact ring on the TH628, operating
Dave It would be nice to have the time and a wide variety of materials to do this. Everyone seems to have a pet material for RF insulators. I did the measurements for materials i use on my job. All w
Several things could explain what is described: 1) The RF oscillator in the preheater is free-running. It is affected by the dielectric in the air capacitor zone. In addition, it is coupled such that
OK. I was wondering if there was a simple way of measuring the properties of a dielectric without access to high power equipment, before incorporating it into high power equipment. I've been looking