I built my old WB5LUA 45-element 23cm loop yagi about
24 years ago. It's been on innumerable roves and
mountaintop contest trips. I've had to replace many
elements due mostly to the thin aluminum oxydizing and
breaking where the screw passes through to connect
them to the boom. I've found that bending the elements
doesn't really degrade the performance of my antenna.
Twisting the elements a bit also doesn't harm anything
measurably.
73,
Paul, K7CW
--- Bill Olson <callbill@hotmail.com> wrote:
>
> Hi Ron, Yep they work just fine upside down, though
> mine are rightside up.. and have survived well,
> probably due to the "decoy" 432 antennas above
> them..
>
> bill
>
>
> > Date: Mon, 4 Feb 2008 11:49:08 -0500
> > To: callbill@hotmail.com
> > From: wz1v@sbcglobal.net
> > Subject: Re: [VHFcontesting] Looking for a 1.2 GHz
> antenna.
> > CC: vhfcontesting@contesting.com
> >
> > Hi Bill: You maybe forgot to mention to mount them
> upside down to avoid
> > bird damage. I've got a recent influx of turkey
> vultures here and they bent
> > the crap out of my 903 loops (it was mounted loop
> side up, oops). These
> > turkey vultures are fat and heavy like real
> turkeys, very destructive! oH
> > yeah, the 1296 looper looks like new (remembered
> to mount that one upside
> > down).
> > -73, Ron WZ1V FN31
> >
> > At 11:35 AM 2/4/2008, you wrote:
> >
> > >Both antennas have great gain. The argument for
> the loop Yagi (Directive
> > >Systems) has in part been wet weather
> performance. Water droplets on the
> > >ends of rod elements (the high impedance points)
> of a rod element (M^2)
> > >Yagi always detune it and this effect gets worse
> as you go higher in
> > >frequency. On the loop Yagi, at least when it's
> horizontally polarized,
> > >and that's probably what we're talking about
> here, water runs around the
> > >loop to the low impedance point and basically
> just runs off the element.
> > >People have often talked about "loops getting
> bent" as a down side of the
> > >loop design, I've never found this to be a
> problem, I've had a pair of
> > >45el 23cm loops, a 47el 903 loop and a 45el 2304
> loop at 120ft (+/-) in
> > >Maine for almost 20 years. they've been through
> ice storms, hurricanes,
> > >LARGE BIRDS, etc and still look and work
> perfectly.
> > >
> > >my $.02,
> > >
> > >bill, K1DY
> > >
> > >
> > >
> > >
> > > > Date: Sat, 2 Feb 2008 22:08:20 -0800
> > > > From: timcoad@gmail.com
> > > > To: alan@muldawer.com
> > > > CC: vhfcontesting@contesting.com
> > > > Subject: Re: [VHFcontesting] Looking for a 1.2
> GHz antenna.
> > > >
> > > > Sorry, I have one of each, and they are both
> great as far as I can tell.
> > > > The Directive Systems came pretty much all
> ready to go just connect the
> > > boom
> > > > halves.. The M2 needed quite a lot of time to
> install all those elements...
> > > >
> > > > Tim - NU6S
> > > >
> > > >
> > > > On 2/2/08, Alan Muldawer <alan@muldawer.com>
> wrote:
> > > > >
> > > > >
> > > > >
> > > > > Looking for a 1.2 GHz antenna.
> > > > > Hi: I am looking for a 1.2 GHz antenna. I am
> not sure if I should go
> > > > > the Directive Systems or M2 or any others. I
> would appreciate any
> > > > > suggestions.
> > > > > Bests & 73
> > > > > Alan N3ALN
> > > > >
> > > > >
> _______________________________________________
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> > > > >
>
http://lists.contesting.com/mailman/listinfo/vhfcontesting
> > > > >
> > > >
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