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
>>
>>
>>
>
_____________________________________________________________________
You don't need to buy Internet access to use free Internet e-mail.
Get completely free e-mail from Juno at http://www.juno.com
Or call Juno at (800) 654-JUNO [654-5866]
--
FAQ on WWW: http://www.contesting.com/towertalkfaq.html
Submissions: towertalk@contesting.com
Administrative requests: towertalk-REQUEST@contesting.com
Problems: owner-towertalk@contesting.com
Search: http://www.contesting.com/km9p/search
|