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[TowerTalk] Antenna Peformance vs. Height and Elevation

To: <towertalk@contesting.com>
Subject: [TowerTalk] Antenna Peformance vs. Height and Elevation
From: n4kg@juno.com (T A RUSSELL)
Date: Thu, 19 Feb 1998 21:59:13 -0600
Yes, but I prefer having high and low antennas that I can instantly 
switch between for both directional and elevation angle diversity.

de  Tom  N4KG


On Thu, 19 Feb 1998 10:40:06 -0500 "Dick Green" <dick.green@valley.net>
writes:
>Hmmm. Is this a good argument for motorized remote-controlled crankup
>towers?
>
>73, Dick, WC1M
>
>-----Original Message-----
>From: T A RUSSELL <n4kg@juno.com>
>To: w7why@mail.coos.or.us <w7why@mail.coos.or.us>; 
>TOWERTALK@CONTESTING.COM
><TOWERTALK@CONTESTING.COM>
To: <towertalk@contesting.com>
>Date: Thursday, February 19, 1998 6:04 AM
>Subject: Re: [TowerTalk] Antenna Peformance vs. Height and Elevation
>
>
>>Antenna Peformance  vs. Height  and  Elevation    de   N4KG
>>
>>>Hi Pete. Also, who is higher in elevation, etc. I have 3 elements on 
>20
>>>at 35 feet and a friend has 4 at 60 feet and I'm consistantly 
>beating
>>>him out. But the location here is about 400 feet higher. 73
>>>Tom W7WHY
>>>
>>
>>Tom -
>>
>>I respectfully disagreee.  Elevation alone has nothing to do with 
>antenna
>>performance.  An antenna at 60 ft above a flat reflecting foreground 
>at
>>2000 ft elevation will have an identical pattern in the vertical 
>plane as
>>an
>>identical antenna at 60 ft above a flat reflecting foreground at 500 
>ft
>>elevation.   TERRAIN and a sloping foreground on the other hand
>>can have significant influence on antenna performance.
>>
>>Regarding antenna HEIGHT above a FLAT GROUND,
>>HIGHER   IS   NOT   ALWAYS   BETTER.  Often, higher angles produce
>>stronger signals than lower ones, especially if the MUF is well above
>>the operating frequency (this is particularly true on 20M) and the 
>other
>>station is also using a low antenna (as is most often the case for DX
>>stations).  If the ionosphere will support waveangles up to 20 or 30
>>degrees and the distant station has a low antenna, he will be 
>radiating
>>more energy at the higher angles than the lower ones.  A receiving
>>antenna that matches the angle with the most energy (most likely
>>one of a similar, usually lower, height, will be the best antenna to
>>transmit back to the distant station.   During mid-day when the
>>MUF is high, my 40 ft TH7 often beats my higher monobanders
>>to Europe and Africa.  (AND, of course, all of my towers are at
>>nearly the same elevation above sea level.)
>>
>>OLD   MYTHS  NEVER  DIE  ....   HIGHER  is NOT  always BETTER
>>
>>de  Tom  N4KG
>>
>>
>>
>

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