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1. [TowerTalk] Rain Induced Voltage (score: 1): Author: Dennis OConnor <ad4hk2004@yahoo.com>; Date: Fri, 1 Dec 2006 04:47:31 -0800 (PST); This morning in Michigan we are having a mix of sleet and freezing rain... I was up early so I wandered out to the shack about 5AM to see if any Pacific DX was coming in on 80 or 160... When I energi; /archives//html/Towertalk/2006-12/msg00006.html (7,719 bytes)
2. Re: [TowerTalk] Rain Induced Voltage (score: 1): Author: Jim Lux <jimlux@earthlink.net>; Date: Fri, 01 Dec 2006 05:45:24 -0800; The mechanism you propose (or one similar to it) is very likely what's going on. Check out the Kelvin Water Dropper electrostatic generator. http://en.wikipedia.org/wiki/Kelvin_water_dropper FWIW, th; /archives//html/Towertalk/2006-12/msg00008.html (9,499 bytes)
3. Re: [TowerTalk] Rain Induced Voltage (score: 1): Author: "k1ttt" <k1ttt@k1ttt.net>; Date: Fri, 1 Dec 2006 13:32:07 -0000; I would keep that antenna disconnected. Thunder snow storms were reported this morning in Wisconsin, and Indiana, and lightning strikes have been recorded in both of them and north west Ohio so far t; /archives//html/Towertalk/2006-12/msg00010.html (9,916 bytes)
4. [TowerTalk] Rain Induced Voltage (score: 1): Author: Phil Camera <kb9cry@comcast.net>; Date: Fri, 01 Dec 2006 08:15:52 -0600; "The voltage appears to be induced by the rain drops dripping off the antenna wire removing" No lightning arrestors (ICE or Polyphasers) in these coaxes, correct? If there were, then they'd safely dr; /archives//html/Towertalk/2006-12/msg00011.html (6,421 bytes)
5. Re: [TowerTalk] Rain Induced Voltage (score: 1): Author: Steve Miller <hsmiller@awsllc.net>; Date: Fri, 01 Dec 2006 09:03:56 -0600; The electrical front of a storm (if I understand it correctly) can precede the storm by more than 20 miles...so definitely disconnect! Steve N0SM _______________________________________________ _____; /archives//html/Towertalk/2006-12/msg00012.html (10,961 bytes)
6. [TowerTalk] Rain Induced Voltage (score: 1): Author: <john@kk9a.com>; Date: Fri, 1 Dec 2006 11:08:35 -0500; Do Polyphaser lightning arrestors drain static? I thought they only shorted to ground after reaching a preset high voltage. He was only measuring 7 volts maximum on his coax. If it did drain at 7 vol; /archives//html/Towertalk/2006-12/msg00020.html (7,752 bytes)
7. Re: [TowerTalk] Rain Induced Voltage (score: 1): Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>; Date: Fri, 1 Dec 2006 11:20:43 -0500; Into a 1 meg load. The static induced voltage would go much higher if there weren't a load, and an arrestor could fire. _______________________________________________ ______________________________; /archives//html/Towertalk/2006-12/msg00023.html (7,217 bytes)
8. Re: [TowerTalk] Rain Induced Voltage (score: 1): Author: Bill Turner <dezrat@copper.net>; Date: Fri, 01 Dec 2006 08:35:01 -0800; ORIGINAL MESSAGE: -- REPLY FOLLOWS -- I think the static is actually cause by highly charged raindrops striking the antenna, rather than by dripping off. Snow can do the same thing. Regardless, you s; /archives//html/Towertalk/2006-12/msg00026.html (8,608 bytes)
9. [TowerTalk] Rain Induced Voltage (score: 1): Author: Phil Camera <kb9cry@comcast.net>; Date: Fri, 01 Dec 2006 10:46:18 -0600; "Do Polyphaser lightning arrestors drain static? I thought they only shorted to ground after reaching a preset high voltage. He was only measuring 7 volts maximum on his coax. If it did drain at 7 vo; /archives//html/Towertalk/2006-12/msg00028.html (6,856 bytes)
10. [TowerTalk] Rain Induced Voltage (score: 1): Author: Dennis OConnor <ad4hk2004@yahoo.com>; Date: Fri, 1 Dec 2006 09:35:20 -0800 (PST); Interesting to see the thread drift... I thank all of those who are concerned about my antennas being unprotected... They are well grounded when not in use, that is why I de-energized the antenna rel; /archives//html/Towertalk/2006-12/msg00030.html (8,801 bytes)
11. Re: [TowerTalk] Rain Induced Voltage (score: 1): Author: Jim Lux <jimlux@earthlink.net>; Date: Fri, 01 Dec 2006 09:49:10 -0800; 7 volts into what impedance. If it was the 10 Megs of a DMM, then you're looking at a microamp at most (which is the sort of magnitude of charging current one might expect). If you're looking at a un; /archives//html/Towertalk/2006-12/msg00031.html (8,989 bytes)
12. Re: [TowerTalk] Rain Induced Voltage (score: 1): Author: Jim Lux <jimlux@earthlink.net>; Date: Fri, 01 Dec 2006 10:36:38 -0800; The voltage to arc over a PL-259 is probably about 4-5 kV. (the free air distance from center pin to shell is probably about 0.15 inches * 70kV/inch = 10.5 kV.. however, that's for an idealized unifo; /archives//html/Towertalk/2006-12/msg00032.html (9,016 bytes)
13. Re: [TowerTalk] Rain Induced Voltage (score: 1): Author: Bill Turner <dezrat@copper.net>; Date: Fri, 01 Dec 2006 11:39:07 -0800; ORIGINAL MESSAGE: -- REPLY FOLLOWS -- Where did the figure of 70 KV/inch come from? My experience and training says closer to 30 KV/inch. Bill, W6WRT _______________________________________________ _; /archives//html/Towertalk/2006-12/msg00035.html (7,684 bytes)
14. Re: [TowerTalk] Rain Induced Voltage (score: 1): Author: "K8RI on TowerTalk" <K8RI-on-TowerTalk@tm.net>; Date: Fri, 1 Dec 2006 15:12:42 -0500; Good old precipitation static. I think it's sorta like a giant Vandergraph generator and there is no convective activity within a distance to induce anything more than QRN. Tops are only 5 to 10,000; /archives//html/Towertalk/2006-12/msg00036.html (13,285 bytes)
15. Re: [TowerTalk] Rain Induced Voltage (score: 1): Author: Jim Lux <jimlux@earthlink.net>; Date: Fri, 01 Dec 2006 12:14:03 -0800; 71 kV/inch is the approximate breakdown for a uniform field in air. As you note, uniform fields hardly ever exist, so one would never use that for practical use. In metric, 3MV/m is about the same ma; /archives//html/Towertalk/2006-12/msg00037.html (8,571 bytes)
16. Re: [TowerTalk] Rain Induced Voltage (score: 1): Author: "K8RI on TowerTalk" <K8RI-on-TowerTalk@tm.net>; Date: Fri, 1 Dec 2006 18:25:01 -0500; <snip> Precip static should not be capable of damaging coax. It should flash over at the connector(s) well before it is capable of damaging the coax itself. Of course there is some cheap coax floatin; /archives//html/Towertalk/2006-12/msg00045.html (9,647 bytes)

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