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In Reply to: Re: It is difficult to determine by your previous posts whether... posted by dudeupshaw@cogeco.ca on November 3, 2006 at 20:17:40:
Only way off if it is 2 that is your problem right on for 1. The gas discharge units are for dispating static buildup on your equipment. They will do nothing for RF bursts showing up on your antenna caused by distant ESD events. You see there is a difference as confusing as it may seem by calling them the same thing.1) is where charge is deposited on some isolated or floating node in your system, normally your antenna. Eventually if charge keeps accumulating on the floating node it will build to a high enough voltage to ionize a current path to some charge sink such as Earth. When left to the devices of nature it seems that the most equipment damaging path is what nature chooses. That is really lame when it happens so we have workarounds. Oneway to deal with this problem is to add a more predictable discharge path that behaves as you have designed it rather than how nature dictates that it act. The gas tubes provide fair isolation for normal operation while providing a fairly low ionization voltage current path for when things start to get charged. PS one way for charge to build up quickly on your antenna is a lightning strike. These gas discharge units when designed in properly can help to address this lightning strike problem too. Note that charge buildup is correctly refferred to as static as that is exactly what it is: a static pool of charge.
2) is different. When we are talking about lightning that isn't directly striking your antenna and is sufficiently removed by distance such that it isn't causing ground bouncing etc. can still be a problem. In other words for 2) we are talking about lightning which is far away. The far away lightning is actually likely maybe like millions of amps of current or something arcing throught the atmosphere between one highly charged object and some other object which is acting as a charge sink, commonly the ground or other clouds etc. During a lightning event a very large amount of charge is accelerated, and those aware with Schroedingers equation know this acceleration of charge results in RF energy getting broadcast into the air just as if it were coming from a radio station antenna. Unfortunately the RF bursts are probably never pleasant music but more likely to be recieved and heard as white noise or pops and clicks. This is often intuitive to old guys who have been around long enough to to remember how brushed DC motors, with all their arcing sparking activity, would ruin the reception on radios and TV's in the vacinity when used. The brushed DC motors were causing the same RF bursts due to the arcing on the brushes on a small scale as the lightning does on a large scale. Obviously the lightning will produce a much more energetic burst of RF than a blender or something so it will be a problem over a much larger area. Note that this RF burst noise is often correctly reffered to as static due to the fact that it is in fact normally caused by lightning which is nothing more than ESD.
Situation 2) sounds more likely to me to be your problem given your description. The two main tools for dealing with remote atmospheric discharge RF bursts are twofold: 1) a more directional antenna 2) higher Q narrower band filters in your tuners recieve section.
Hope this helps out a bit.
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- Re: It is difficult to determine by your previous posts whether... - Ugly 15:49:56 11/04/06 (0)
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