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Effect of raising vertical antenna higher
On Mar 1, 9:12 am, Buck wrote:
However, Steppir antennas says that an antenna on the ground needs 120 radials just to match one in the air with two radials. That would only apply to an elevated antenna 1/2 wave or higher up though.. I would like to know where the noticable benefit of raising an antenna above the ground actually takes place and where is the maximum benefit. I know that the higher the better, but rather than that kind of benefit, I am wondering from a ground standpoint where the benefits start and where the point of diminishing returns begins. Just depends on the band, the path/angle used most of the time, the ground quality, etc, etc.. Raising it to 40 ft from 12 feet would make a noticable difference if you compare all the various types of paths. IE: Just the local ground/space wave will be improved a good bit. As far as the ionosphere, would effect farther off stations more, than closer in. It's possible for the low antenna to be nearly as good on a short/medium hops, but DX will be better on the higher antenna and possibly open/close the band a bit earlier/later. Ground loss will be lower, but I'm not sure it's worth the cost of the cherry picker.. I'd tend to say not, being a cherry picker is usually not cheap.. Being the current antenna is just a bit less than a 1/4 wave up, it's not in near a bad a shape as say a 80 or 40 antenna at that height in feet. MK |
#2
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Effect of raising vertical antenna higher
question what is the effect of raising a vertical
practical or theoretical ? Nice answers to think it all over Practical the higher the better why from own experiments a long time ago on 26 security , 145 ham 151 privat and 156 nautical the following to think higher is better in my case optical horizon and the reach of the tx an other effect to mention is human noise the higher the antenna the less noise that is a practical profit one of the group mentioned mechanical aspect notice radials said an other 120 is that practical only 1 practical is enough use your radials as quide ropes and you may solve a supportproblem mind that the angel of the rial(s) and erected radiator effetcts the radiationresistor 90 degrees . 35 ohm 180 degrees 75 120 degrees about 50 ohms and al between Mind that a higher vertical is more sensitive for statics solve that effect by resitor or neonbulb(lightning protection I like your dicussions however some things are not know at the other side of the swimmingpool 73 and 55 fde ruud PA0rab schreef in bericht oups.com... On Mar 1, 9:12 am, Buck wrote: However, Steppir antennas says that an antenna on the ground needs 120 radials just to match one in the air with two radials. That would only apply to an elevated antenna 1/2 wave or higher up though.. I would like to know where the noticable benefit of raising an antenna above the ground actually takes place and where is the maximum benefit. I know that the higher the better, but rather than that kind of benefit, I am wondering from a ground standpoint where the benefits start and where the point of diminishing returns begins. Just depends on the band, the path/angle used most of the time, the ground quality, etc, etc.. Raising it to 40 ft from 12 feet would make a noticable difference if you compare all the various types of paths. IE: Just the local ground/space wave will be improved a good bit. As far as the ionosphere, would effect farther off stations more, than closer in. It's possible for the low antenna to be nearly as good on a short/medium hops, but DX will be better on the higher antenna and possibly open/close the band a bit earlier/later. Ground loss will be lower, but I'm not sure it's worth the cost of the cherry picker.. I'd tend to say not, being a cherry picker is usually not cheap.. Being the current antenna is just a bit less than a 1/4 wave up, it's not in near a bad a shape as say a 80 or 40 antenna at that height in feet. MK |
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Effect of raising vertical antenna higher
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