[Lowfer] Overall Antenna Efficiency

[riese-k3djc at juno.com]

Andy 

FYI 

I have 60 radials down for my 160 meter L
If you relate antenna efficiency to band width
I noticed in order to see a change I had to double the radial
count,, going from 10 to 12 couldnt see much change had tp
go to 20 to see a difference

This is just empirical observations, The wires are all short 40 +- feet
and ran in only a 180 ^ direction but that was my feeling as I added them

Bob K3DJC 


On Thu, 21 Oct 2010 08:23:19 -0700 (PDT) Andy - KU4XR <ku4xr at yahoo.com>
writes:
> Hi Lee, And lowFERs:
> 
> First the BIG DISCLAIMER: I am not an antenna engineer !!! I am an
> experimenter... some like that, and some don't. I don't crunch the
> numbers, BUT !!! those numbers are absolutley necessary, because 
> it's
> the antenna theory that the qualified engineers have used over the 
> years to develop antenna systems with great efficiency. For my 
> part;
> this is a hobby, as it should be. I read a lot, understand some of 
> it,
> and some I don't. I'll leave the theory, and number crunching to 
> the
> guys who really understand it.
> 
> Now, my comment on the radials. I see the same thing that J.B. 
> said,
> signal radiation is not affected by my radial system as far as the
> direction of strongest radiation. I only have radials laid out in a
> 180 degree pattern, covering the NE, to SW directions, and that's
> mainly because there's no need to run them underneath my mobile 
> home.
> The greatest benefit from the radial system is to lower the losses
> from earth resistance as much as you can, because that is where the
> biggest loss is at in a lowFER vertical antenna setup. Loops are of
> course the exception, operating without the need for radials.
> You will see a noticable directional enhancement effect with the 
> radial system when the radials approach 1/4th wavelength at the 
> operating frequency. It's very easy to see that we get no where
> close to that length with our radials.
> 
> 73, and have a good day:
> 
> BTW; I noticed a very slight hint of my signal on Ralphs grabber
> around  1:53 to 1:54 UTC which would be 8:53 am his local time.
> That's still close enough to early morning that some skywave
> could be present, but it is in there during daylight, even though
> it's only a blip on the radar screen... Note #2; I have no radials
> going in that direction either..
> 
> 
> Andy - KU4XR - EM75xr - Friendsville, TN. USA
> LOWfer Beacon " XR " @ 185.29875 KHz ( QRSS-60 )
> Coordinates:  N:  35º 43' 54" - W:  84º 3' 16"
> 
> http://www.myspace.com/beaconxr
> 
> http://ku4xr.webs.com
> 
> http://lwca.org/community/YaBB.pl
> 
> *** The 5 most important words ever spoken ***
> 
> http://ku4xr.webs.com/5mostimportantwords.htm
> 
> 
> --- On Thu, 10/21/10, John Bruce McCreath <weazle at hurontel.on.ca> 
> wrote:
> 
> > From: John Bruce McCreath <weazle at hurontel.on.ca>
> > Subject: Re: [Lowfer] Overall Antenna Efficiency
> > To: "Discussion of the Lowfer (US, European, & UK) and MedFer 
> bands" <lowfer at mailman.qth.net>
> > Date: Thursday, October 21, 2010, 9:18 AM
> > Hello Lee, Lowfers,
> > 
> > My own findings with beacon EAR is that I've not noticed
> > any favouritism in reception reports.  My
> > antenna-radial
> > system is basically a capital H laid on its side, with the
> > two radials directly beneath the antenna.  The ends are
> > in
> > an NE-SW orientation, yet I've had good reports from
> > stations broadside to it.  There you go for what it's
> > worth.
> > 
> > 73, J.B., VE3EAR
> > 
> > LowFER Beacon "EAR"
> > 188.830 kHz. QRSS30
> > EN93dr
> > 
> > 
> > 
> > 
> > 
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