[Antennas] spencer dipole from Mccoy's book

2002年1月04日 21:34:46 -0800

Thanks. You have comfirmed what I do. I use the twine as a 'carrier' for 
the window line, allow the line to loop and also a bit of twine to take the 
rain off. The 'carrier' acts as one of the 4 'guys'. Another twine runs 
180degrees or opposite, the droopy dipole acts as the other 2 guys. So the 
flimsy mast ( odd and sods of pipe) is guyed at the top. The middle mosves 
with gusts but everything stays great.
Chris opr VE7HCB
At 06:36 PM 2002年01月03日 -0600, you wrote:
>Chris,I use 1/4 nylon rope interwoven between the windows...Tie it to the
>center or better the support as I use a yardarm off the tower.And,tie it to
>the house with a EYE-bolt...has worked for years and since I started doing
>this no wind damage...john
>----- Original Message -----
>From: "Chris BONDE" <[email protected]>
>To: <[email protected]>
>Sent: Thursday, January 03, 2002 6:21 PM
>Subject: Re: [Antennas] spencer dipole from Mccoy's book
>>> > OK. Thank you. The stuff I have now is "window-ed" line. I have been
> > calling it ladder line. 450 ohm.
> > The windows are put into the line VS the rungs are put between the lines.
> > I remember helping a ham make some ladder line. He was using his
> > daughters' "Toni" hair curlers (plastic). Put the wire in the ends where
> > the elastic was to go, heat the end a little, just right, and push closed
> > around the wire.
> >
> > Someone said put paste wax on the ladder line. Will do next time. I put
>a
> > twist in the run of the line to stop wind whip. A twine rain loop is just
> > under the roof eve.
> >
> > Any other suggestions for the keeping of the parallel transmission lines?
> >
> > Chris opr VE7HCB
> >
> >
> > At 06:14 PM 2002年01月03日 -0500, you wrote:
> > >snip
> > > > OKnow please tell me the difference between window line and open
>ladder
> > > > line. I have wondered about what the rain would do to the line. So
>it
> > > > makes the line "lossyer"?
> > > > Chris opr VE7HCB
> > >
> > >Hi Chris,
> > >
> > >The only difference in Window line and true ladder line is the method
>that
> > >is use to separate the two conductors. Window line is manufactured by
> > >embedding the two parallel conductors in PVC or Some other plastic and
>then
> > >cutting windows in the insulation to reduce the detuning effect of rain
>or
> > >wet conditions and it also make the line less prone to wind loading.
> > >
> > >True open wire line usually has the conductors held apart by some type of
> > >spacer such as wood, plastic I've even used clothespins before.. the
> > >impedance of the Line is a result of wire size and spacing distance. 300
> > >ohm line is usually encased in solid poly or pvc. it is ok when dry but
> > >maybe as lossy coax when wet..
> > >hope this is of some help to you
> > >73, Dave
> > >
> > >P.S. as someone has already mentioned keep the line about 3 times the
> > >distance between conductors away from conducting surfaces and you should
>be
> > >all set..
> >
> > _______________________________________________
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> > http://mailman.qth.net/mailman/listinfo/antennas
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