Date: Tue, 22 Jan 2008 17:07:02 +0100
To: rsgb_lf_group@blacksheep.org
From: Rik Strobbe <rik.strobbe@fys.kuleuven.be>
In-Reply-To: <6fr2vh$9mks42@ip06.eastlink.ca>
References: <20080122135712.5D7C8F3862@smtps02.kuleuven.be>
 <6fr2vh$9mks42@ip06.eastlink.ca>
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Subject: RE: LF: Fenceline longwire
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Vern,

almost omnidirectional and 90 degrees takeoff.
But don't believe too much of that.

73, Rik ON7YD

At 16:40 22/01/2008, you wrote:
>HI Rik...
>
>I use a 2000' and 1000' unterminated longwires that simply lay on the ground
>and are used specifically for 500khz and down. I have been very impressed
>with their performance on NDB's etc. Beacons ranging in the 5000-7000 km
>range are heard on a nightly basis. Just wondering what your software say's
>for these as far as expected performance.
>
>Vern - VE1VDM
>
>-----Original Message-----
>From: owner-rsgb_lf_group@blacksheep.org
>[mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of Rik Strobbe
>Sent: Tuesday, January 22, 2008 9:58
>To: rsgb_lf_group@blacksheep.org
>Subject: Re: LF: Fenceline longwire
>
>J.B. ,
>
>I simulated the fence wire with MMANA.
>On HF (80m, 40m)  I got the expected (bi)directivity and low offset angle.
>But on 500kHz the horizontal pattern is almost omnidirectional and the
>offset angle is 78 degrees.
>It seems that (at least in theory) even 1200 foot is too short to be long
>on 500kHz ...
>Or does MMANA not work properly ?
>
>73, Rik  ON7YD
>
>At 15:52 21/01/2008, you wrote:
> >Hello LFers & Lowfers,
> >
> >I've been testing a 1200 foot end fed longwire mounted on an existing
> >fence-line and coupled to the receiver with a
> >3:1 turns ratio isolation transformer.  The antenna is 3 feet off the
> >ground, with the far end left un-terminated.
> >The "ground" for the cold end of the antenna winding is a stainless
> >steel screwnail driven into the trunk of a cedar tree at ground level.
> >
> >The antenna is aligned 50/230 degrees true, which from my QTH favours
> >Europe/UK off the front and the mid-west U.S.
> >off the back.  Listening to ATC frequencies from Gander and Shanwick in
> >the 2500 to 3000 kHz. range, the longwire is several S units stronger
> >and MUCH quieter than my 80 M inverted V.
> >
> >On 500 kHz. I've been able to copy the XGR transmissions with better
> >signal strength than off my PA0RDT mini-whip or untuned delta loop.
> >The same holds true for listening around the broadcast LW & MW bands or
> >NDB chasing.
> >The greatest advantage is that signals are well above the noise on the
> >longwire.
> >
> >Thinking outside the box can sometimes yield a surprising result, if
> >that's the only option you've got!
> >
> >73, J.B., VE3EAR - VE3WZL
> >Solar and wind powered
> >Lowfer " EAR"  188.830
> >EN93dr
> >
> >http://www.hurontel.on.ca/~weazle
>
>
>Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm


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