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"Dave Shrader" wrote in message news:Xu36c.33004$po.292953@attbi_s52... John Michael Williams wrote: SNIP However, the first radios transmitted sparks, so in principle it should be possible to transmit near a long wire separated by a small gap from ground or another wire and get a small spark. So, I decided to try an experiment. SNIP There is one other potential source for a spark that you did not investigate. A make/break contact in a switch causes sparks when opened. The US Military specifies special shielded switches for their explosive, gas vapor, etc., environments. So, it is possible that pressing the PTT or the ON/OFF switch causes the necessary spark. Remember the Apollo ground fire. A switch/spark caused an oxygen explosion. I wouldn't call it an "oxygen explosion" but a small fire that grew rapidly due to the pure-oxygen atmosphere. |