and operate against ground for 160 meters. Somewhere on his website, L B
> -----Original Message-----
>
>
> Dave (and Don),
>
> Not a silly question, Dave, what so ever.
>
> My suggestion was to open it up 90 degrees from the present
> feed-point, 1/4
> way around...this being a voltage maximum (loop) and current
> minimum (node).
>
>
> This enables the loop to still act like a loop on 80, if you desire to
> maintain it's present performance. And then on 160 it acts like, as Don
> states, "a folded back 1/2 wave dipole on 160 meters" but in this case it
> will be off center fed. Auto 80/160 band switching, once you get the
> lengths correct for the two bands, if that is possible in this
> case, as I do
> not know what modes you operate.
>
> If you open it at, as Don suggests, 180 degrees or half way round, the 80
> meter loop turns into a bent 80 meter "2 Half-waves in Phase" with a very
> high Z feed, if you maintain the feed point as is. This also shifts the
> standing wave current distribution by 90 degrees, which might cause you
> problems if your original antenna was set up to favor a particular area of
> the world. Not convinced that is the case though, as it does
> sound like you
> have up 270 feet of wire in a triangular loop, "cause that's
> where the trees
> be". Wish I had those trees -- hi.
>
> 60 feet above ground is low for a horizontal 160 meter sky hook,
> but you do
> what'cha gotta do.
>
> Sounds like a fun modeling and empirical experiment to say the least.
>
> Regards -- Rick -- W5RH
>
> -------------------------------------------------
>
> Dave,
>
> Open it at the point 180 degrees (midway around) from the feedpoint. If
> your existing loop is a full wavelength on 80 meters, opening it will turn
> the loop into a folded back 1/2 wave dipole on 160 meters - not as good as
> straight out, but it should work since you are feeding the line
> with a tuner
> anyway.
> In fact, you may be able to make it automatic by using a trap tuned to 160
> meters - that will electrically open the loop on 160 and only add some
> inductnce on the other bands.
>
> 73,
> Don W3FPR
>
> > -----Original Message-----
>
> >
> > Not sure where you are suggesting I open it. I was considering
> > disconnecting the feedline on one side where it connected to the balun.
> > Is this what you mean. My apologies if it is a silly question.
> >
> > David Wilburn
> >
[hidden email]
> >
> >
> >
> > Rick Hiller wrote:
> > > Dave,
> > >
> > > Another possibility for 160 -- Don't know to what extent/effort
> > you want to
> > > go to get on 160, but here is an easy way, although, a bit of a
> > compromise.
> > >
> > > Simply open the loop at one of the 80 meter voltage loops (also
> > a current
> > > node). The 80 meter standing wave current distribution
> > /performance will
> > > not change, but it will force the wire to be an off center fed 1/2
> > > wavelength for 160. Although not quite resonant within the 160
> > meter band,
> > > if you feed it with open wire and run it thru the appropriate matching
> > > network, you should be right.
>
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