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capacitive discharge. This indeed is precursor to a lightning "strike". This is why the lightning arrestors are placed on top of tall and large structures. A lightning arrestor physical characteristic is long and comes to a point and terminates directly to ground. This is a means to allow a controlled small amount of charges into the atmosphere thus defusing the possibilities of a "hit". When you have a large flat metallic or even wood structure that can allow a "large discharge" into the air at one time, you then have the "hit" that we all so much fear. Trees are "hit" in a field for this reason but it doesn't mean that you can not have a "hit" directly at ground level. The last thing that you want to do is disturb the charge that may be polarized on such a field. You don't want to assist the charges to the point of getting a "strike". The word "strike and hit" are misnomers too. A better name would be "discharged". But I guess that doesn't sound threatening enough. If you all are experiencing this discharge, you may be great candidates for having a large discharge that will ultimately do irreversible harm. Please investigate the possibilities of erecting arrestors. The sooner the better. Mr. Wizard. 73 BN> I have yet to hear it, but my wife swears she hears a high-pitched 'crackle' BN> when storm clouds pass by. Almost a bacon-frying sound she says. NO rain or BN> thunder... BN> -Brian n8wrl BN> ----- Original Message ----- BN> From: "Francisco Costa" <fcosta@mail.telepac.pt> BN> To: <Force12Talk@qth.com> BN> Sent: Wednesday, June 26, 2002 6:24 PM BN> Subject: [Force 12 Talk] Chirp-Chirp >> Hi All >> >> About two weeks ago, the day before I went on holidays, >> as usual, I disconnected all antennas from my radios. >> (This allow me to have a more relaxed vacation :0) >> Without coincidence, later that same day, very dark clouds >> sudenly appeard and promised a storm. But despite some >> rain drops, no thunder or lightning was observed. >> However a (very) wierd thing was noted: when those dark >> clouds were forming, on my back yard a strange sound >> come out of no where! >> First it sound like a "clik", but then sounded more like a >> "chirp". The cadence wasn't constant, but during a brief >> period it was less than a second, like: "chirp-chirp-chirp". >> I look around for the source of the sound and it lead me >> to my new self suported 15m tower. On top there are >> 3 antennas: 5 elem 6m and 21 elem 2m yagi from Tonna, >> and a Force 12 C4XL. I was about to climb to the top >> to check exactly the origin of the sound, but for obvious >> reasons I gave up the idea. Even so, I'm preety sure the >> sound came from the C4XL. But I don't understand why! >> I never have "seen" this kind of efect on an antenna. >> Have you? Do you have a reasonable explanation for this? >> If you, I really apreciate your help. >> Thanks in advance. >> >> Best 73 >> F.Costa, CT1EAT >> http://www.qsl.net/ct1eat >> >> P.S. FYI the tower has a good earth (8.9 Ohm, last measured) >> >> >> >> -------------------------------------------- >> Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. >> Force12 Web Site: http://www.force12inc.com >> >> To Submit Message to the List: Force12Talk@qth.com >> To unsubscribe and view the Message Archive: see BN> http://qth.com/force12/list >> For problems with the list: contact n4zr@qth.com >> >> BN> -------------------------------------------- BN> Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. BN> Force12 Web Site: http://www.force12inc.com BN> To Submit Message to the List: Force12Talk@qth.com BN> To unsubscribe and view the Message Archive: see http://qth.com/force12/list BN> For problems with the list: contact n4zr@qth.com -- Best regards, GH mailto:hasg@net-gate.com -------------------------------------------- Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. Force12 Web Site: http://www.force12inc.com To Submit Message to the List: Force12Talk@qth.com To unsubscribe and view the Message Archive: see http://qth.com/force12/list For problems with the list: contact n4zr@qth.com |
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