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LF: RE: Telephone wires

To: [email protected]
Subject: LF: RE: Telephone wires
From: "Gary - G4WGT" <[email protected]>
Date: Wed, 17 Nov 2004 18:24:27 -0000
Importance: Normal
In-reply-to: <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
Hi All,

You just beat me to it there, a radio amatuer friend of mine did actually
refuse the Post Office permission to run telephone wires over his land for
the very same reason, theinstalled a new telephone post & bypassed his
garden.

Regards

Gary - G4WGT

Web: http://myweb.tiscali.co.uk/wgtaylor

-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of captbrian
Sent: 17 November 2004 15:31
To: [email protected]
Subject: LF: Telephone wires


neighbours telephone wires across my garden are an upcoming hazard for me
also.

Why not tell phone company to take 'em away?
Did they ask your permission to put 'em there?

Bryan g3gvb ( In w-land this month tho' ]

Quoting Lawrence Mayhead G3AQC <[email protected]>:







========================================
Message date : Nov 17 2004, 09:20 AM
From : "OSBORN, Chris"
To : "LF Group (E-mail)"
Copy to :
Subject : LF: Loading Coils



Hello LF Group

Many thanks for all comments and advice - most interesting.

I drilled out the wooden dowels on the loading coil and replaced
them with lengths of 15 mm plastic water pipe.
I was unable to obtain plastic rod at short notice and my XYL
wouldn't let me have her knitting needles !
The pipe was not really rigid enough and bent slightly but was
sufficient to prove the experiment.
With this new arrangement I obtained my personal best Q of about
250..

Placing the new coil in the aerial circuit made a slight improvement
to the aerial current - from about 1.2 A to 1.5 A
I would have thought that as most of the losses were in the coil a
bigger current improvement would have been achieved.

I share my office with some young electronics engineers and was
surprised that they know very little about RF inductors or Q factor.
It must be a dying art !

My next improvement will be to raise the 'droopy' end of my aerial,
presently at a height of about 5 metres
Unfortunately two neighbours' telephone wires pass over my garden
where the mast was to be situated.
Any suggestions - should I go over the wires or keep well clear of
them and cut a length off the aerial ?
Presumably I can't get the phone company to move their wires !!

73 Chris G3XIZ

Hi Chris,
Major losses are ground losses ! This is very difficult to overcome,
buried
radials do not seem to help presumably because the lengths that most of us
can manage are too short. I have found that by far the best way if
lowering
losses is to put more wire in the air. One meter of  wire in the air is
worth
100m in the ground ! This extra wire does not have to be in a straight
line
but it must not be too close to existing wires.So try a zig zag or radial
top
hat. Do try to raise the low end also since this works against the height
of
the vertical section and lowers the radiation resistance.
Best of luck Laurie.

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