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JB wrote:
enough to avoid problems with the transmitter. Multiple series gaps only raises the firing voltage, but the breakdown voltage will be set by the largest gap in the series. A gap at .035 will fire at about 2-10kv depending on humidity. You only want it wide enough so that it won't arc Humidity doesn't change the breakdown voltage very much. In fact, increasing humidity increases the breakdown voltage. One correction table for a "rod gap" with 1/2" square electrodes has a 10% correction going from 15 torr to 30 torr water vapor pressure and a -16% correction going from 15 to 2.5 torr, which is nowhere near the 5:1 variation cited above. Interestingly, on this basis water vapor is a better insulator than nitrogen, since density of the humid air is actually less. Typical breakdown voltage tolerance on a rod gap is +/- 8%. |
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