[ Reply | Next | Previous | Up ]
From: Maurice Hately GM3HAT
Date: 08 Apr 2003
Time: 14:16:28
Remote Name: 80.225.138.62
Yes unfortunately the professionals do appear to be inept. The CFA as originally presented needed Two Tuned circuits slightly off tune to get the necessary 90 degrees of phase difference between the currents providing the Electric field, and the one providing the magnetic field. The circuits had to be in resonance in order to get the necessary high voltages on the working plates to make the Electric lines ( D or displacement current) sufficiently energetic to stress the interaction zone with enough field. Several people tried to look for the action with 50 ohm impedance sources on both. In order to get enough energy per half cycle the voltages have to be of 900V, and this can only be obtained by a resonating parallel tuned circuit. Then the same applies to the D plate generating magnetic field. Again a circuit in resonance is required...getting another 900 volts. (remember the energy in a capacitor is a function of the voltage SQUARED). Then the two voltages have to be each plus or minus 45 degrees...so the circuits have to be off resonance by a little bit to find the total difference of 90 degrees. There is the difficulty----two circuits in resonance to get the and yet off tune to get the required overall 90 degrees. I believe that the attempts by the professionals have all failed because they will go to the single ciruit in full resonance, and can then not find any action with the other plus or minus 45 degrees. It is hopeless looking for the action with a VSWR meter in the combined feed. One must use a wide-band field strength indicator. When something is seen, the tuned circuits are tweaked alternately by small increments to optimise the radiation seen. Only when the two circuits are correct can the feedline be seen to have a lowish VSWR. Maurice C Hately, GM3HAT