Quote:
Originally Posted by Mike(Mont)
Or is it "Total confusion"? 
First off, I have not built the TOTeM project so I don't know for sure.
Okay, I think something is not right and I just wanted to put this out so you can decide if I am right or I am wrong. Sorry didn't post the diagram that shows the null lines for the ferrite rod. It is figure 7 in the "Pistol Detector TOTeM Project". In the diagram the null lines come off the edge of the coil (right at the windings) at 45 degrees. i do not think this is right but I could be wrong. I think the null lines should come off 45 degrees from the CENTER of the TX coil. For a four inch (10cm) diameter coil, that's going to move the ferrite rod back about one inch (about 2.5 cm). Tell me if I am right or wrong. 
If I'm right, this is my New Year's present to the forum. Can you hear me now? |
The diagram in the TOTeM project is correct. The magnetic field is strongest close to the windings, and weaker at the center of the coil, as shown by the Biot-Savart Law.