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#1
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SHould this be grounded or not?
Should a dual band open stub j pole like the one arrow makes be
grounded or not? Seems like someone told me no j polls should be grounded according to their nec program. The website says it can be grounded or not. If it should not, then how do you protect from lightening? |
#2
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Should a dual band open stub j pole like the one arrow makes be
grounded or not? Seems like someone told me no j polls should be grounded according to their nec program. The website says it can be grounded or not. If it should not, then how do you protect from lightening? ================================================= Earthing any antenna does not protect against a lightning strike. The best way to protect equipment attached to any antenna is to disconnect the feeder near the radio equipment , keeping the feeder metal connections away from any other metal. When I go away from home expecting 'static' activity and lightning ,I always disconnect the antenna feeders and 'park' the connectors inside a plastic box However ,earthing an antenna does help preventing static charge build-up . Hence following a feeder disconnect ,before reconnecting it to radio equipment , I briefly 'touch' the feeder connection(s) to earth. My double ZEPP or Doublet wire dipole with balanced ribbon feeder has 2 ea composite 47 kOhms resistor at the matching unit (tuner if you wish) connected to chassis/earth. Frank GM0CSZ / KN6WH |
#3
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But what if something happens and your away from home, like a freak
thunderstorm? Should a j pole like this be grounded or not? |
#4
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#5
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On Tue, 25 Jan 2005 21:34:44 GMT, "Highland Ham"
wrote: Should a dual band open stub j pole like the one arrow makes be grounded or not? Seems like someone told me no j polls should be grounded according to their nec program. The website says it can be grounded or not. If it should not, then how do you protect from lightening? =============================================== == Earthing any antenna does not protect against a lightning strike. The best way to protect equipment attached to any antenna is to disconnect the feeder near the radio equipment , keeping the feeder metal connections away from any other metal. When I go away from home expecting 'static' activity and lightning ,I always disconnect the antenna feeders and 'park' the connectors inside a plastic box However ,earthing an antenna does help preventing static charge build-up . Hence following a feeder disconnect ,before reconnecting it to radio equipment , I briefly 'touch' the feeder connection(s) to earth. My double ZEPP or Doublet wire dipole with balanced ribbon feeder has 2 ea composite 47 kOhms resistor at the matching unit (tuner if you wish) connected to chassis/earth. Frank GM0CSZ / KN6WH You don't put the end of the cable in a pickle jar filled with water? 73 Gary K4FMX |
#6
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Gary Schafer wrote:
You don't put the end of the cable in a pickle jar filled with water? Totally ineffective. The proper way earth your cable is into the nearest available plant-pot. People did this in the days of Mr Marconi and aspidistra plants, so it must be all right... maybe you'd better talk to the plant first, to make sure the pot is filled with genuine earth. -- 73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.co.uk/g3sek |
#7
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Ian White, G3SEK wrote:
Gary Schafer wrote: You don't put the end of the cable in a pickle jar filled with water? Totally ineffective. The proper way earth your cable is into the nearest available plant-pot. People did this in the days of Mr Marconi and aspidistra plants, so it must be all right... maybe you'd better talk to the plant first, to make sure the pot is filled with genuine earth. I've heard of using an "artificial ground". Is this where you fill the pot with vermiculite or styrofoam? Roy Lewallen, W7EL |
#8
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Roy Lewallen wrote:
Ian White, G3SEK wrote: Gary Schafer wrote: You don't put the end of the cable in a pickle jar filled with water? Totally ineffective. The proper way earth your cable is into the nearest available plant-pot. People did this in the days of Mr Marconi and aspidistra plants, so it must be all right... maybe you'd better talk to the plant first, to make sure the pot is filled with genuine earth. I've heard of using an "artificial ground". Is this where you fill the pot with vermiculite or styrofoam? Exactly. You're really getting the hang of it now. -- 73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.co.uk/g3sek |
#9
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I think I just had an ephihony,
A regular j pole uses a shorted stub, so, If the regular j pole was grounded, no need to cround the coax? |
#10
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