[Elecraft] OT: Elevated vs. Buried Radials

[Ralf Wilhelm]

Exactly... Talking about Dayton discounts and hats (are they "equipment"?), that is why I became radio amateur ...

73, Ralf, DL6OAP

Am 19.05.2013 um 16:19 schrieb "tomk7zz ." <tomk7zz at gmail.com>:

> Can we possibly get back to topics that are relevant to Elecraft
> equipment.  Find a different forum to talk antennas!
> 
> 73,Tom (K7ZZ)
> 
> 
> On Sat, May 18, 2013 at 11:36 PM, Oliver Johns <ojohns at metacosmos.org>wrote:
> 
>> ELEVATED RADIALS:  I think Joe hits it on the head here.  A vertical with
>> elevated "radials" is essentially an OCF dipole.  There is no particular
>> reason for the "radials" to be a quarter wavelength.  They should be
>> whatever length lets you resonate the antenna with a feed impedance you can
>> live with.
>> 
>> IMPT POINT:  If you want your antenna actually to have a vertical
>> radiation pattern (low angle, omni-directional) then the elevated radials
>> must be symmetric.  If there are two, they must be of exactly equal length
>> and point in exactly opposite directions.  If there are four, they must be
>> equal and point in directions 90 degrees from one another. This symmetry
>> guarantees that the "radials" do not radiate.  The do carry currents, they
>> do help resonate the antenna, but if they are symmetric radiation from them
>> cancels and they therefore do not radiate appreciably.
>> 
>> 73,
>> 
>> Oliver
>> W6ODJ
>> 
>> 
>> On 18 Jan. 2013, at 06:46 AM, "Joe Subich, W4TV" <lists at subich.com> wrote:
>> 
>>> 
>>>> Personally, I do wonder about the new fangled "no radials required"
>>>> antennas. But, I have an old R5 and it works well.
>>> 
>>> The "no radials" antennas are basically a vertical OCF - the short
>>> decoupling radials are the short leg and the vertical is adjusted
>>> through the use of traps, stubs and/or loading to resonate on the
>>> desired band with the fixed length (typically 42") of the short
>>> "radials".
>>> 
>>> 73,
>>> 
>>>  ... Joe, W4TV
>>> 
>>> 
>>> On 5/18/2013 9:25 AM, Bill wrote:
>>>> The cleanest installation is to put the radials in the ground - but, not
>>>> portable at all. The idea is a capacitance connection with the earth. I
>>>> have used welded steel cattle fence in the past - I build a mat that is
>>>> about 30 or 40 feet out from the base of the antenna.
>>>> 
>>>> For raised radials - they must be resonate to function properly. Three
>>>> or four per band or related band. They have to be high enough that they
>>>> present no danger to anyone roaming around your antenna field. They can
>>>> be drooping or horizontal - both work well.
>>>> 
>>>> Personally, I do wonder about the new fangled "no radials required"
>>>> antennas. But, I have an old R5 and it works well. Perhaps the way to go
>>>> is a new antenna that just gets bolted to a post and a feedline
>>>> attached. Sure makes life easier and from folks I talk to all the time -
>>>> they do work. Forget that they are a little expensive. You buy an
>>>> antenna to use for years.
>>>> 
>>>> Read the eHam reviews and see what other users are saying before you buy
>>>> anything. Ask on the air.
>>>> 
>>>> The best I ever had was a Butternut of some kind over a bunch of buried
>>>> fence. Might still be the way to go. But, if I was doing it now, I'd be
>>>> looking at a "no radials required" antenna. My reasoning is somewhat age
>>>> related.
>>>> 
>>>> Be looking forward to the sage advice that will come from this post. It
>>>> is summer - so it is antenna time.
>>>> 
>>>> Bill W2BLC
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>> 
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