[Antennas] vertical noise

2003年3月14日 12:17:56 -0500

My experience also confirms Bob's.
I have a 40M EDZ aimed at Europe and a 40M vertical with four elevated 
radials. I was quite surprised when I compared the two into Europe: 
 The EDZ was consistently 1-2 S-units louder. My observations were 
confirmed when I compared the models for each: The EZNEC model showed 
the EDZ had 10 dB again over the vertical in its favored directions. On 
the other hand, when working long haul DX (ZL from Virginia), the EDZ 
and vertical were about equal despite the fact that this direction was 
also a favored direction for the EDZ. I presume that the lower take-off 
angle for the vertical allowed the signal to arrive with fewer hops and 
consequent lower loss on this longer path, so that the signal strengths 
were now about equal.
My QTH is quite quiet electrically. Typically, the only source of 
electrical noise is my own house. The vertical is always much noisier 
than the EDZ. (I have never actually looked at the S-meter when doing 
this check.)
73, Joe
Robert Lay - W9DMK wrote:
>On 2003年3月13日 18:14:21 -0600
> [email protected] wrote:
>>>>The 80m band (sometimes 40m) is very noisy around here.
>>>>I've heard that a typical vertical, even with good ground radials,
>>is quite noisy when compared to a dipole especially on 80m and 
>>40m. This is for both verticals on the ground with a good radial 
>>system and those elevated and using a counterpoise radial system. 
>>Also that most AC power distribution noise is vertically polarized.
>>What are some comments by those who have used both ? 
>>>>>>Yes, you will have more noise on any vertical when compared with a
>Herzian antenna. The reason is more that just AC power distribution
>noise - as I understand it, the ambient background noise all over the
>world is vertically polarized - go figure!
>>Beyond the question of noise, most people with good, high dipoles will
>find that they will beat out a vertical, hands down, when you do an
>honest A/B comparison test. Anyone who works DX with a vertical will
>claim to the contrary. You will never know for sure until you make
>your own A/B switch tests in QSO. That's the way I made my decisions.
>>73 de W9DMK (Bob Lay in Dahlgren, VA)
>http://www.qsl.net/w9dmk
>- - - 
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