I was wondering the same thing. If the tribander was really seeing
the saltwater, then its effective height would have been 430' ASL,
whereas the curtain array phase center would have been at around
520' ASL (400 + 240/2). Doesn't seem like that would have been
enough to account for the large difference in signal strength.
Maybe we should repeat the test :):):)
Mike, W4EF.................
----- Original Message -----
From: <n4kg@juno.com>
To: <TOWERTALK@contesting.com>
Sent: Thursday, January 31, 2002 11:04 PM
Subject: Re: [TowerTalk] Everything Works QST Article by N6BT
>
> On Thu, 31 Jan 2002 "Mike" <W4EF@dellroy.com> writes:
> >
> SNIP
> >
> > As far as the reference to the non-linear ionosphere, I couldn't
> > find any. One could infer that this is weakly implied in Tom (N6BT's)
> > musings about the seemingly inexplicable huge differences between
> > the curtain array and the tribanders on Saipan, but in my opinion that
> > would really be a serious stretch. BTW, I suspect the huge differences
> > between the two antennas are a combination of poor S-meter calibration
> (very
> > common) and very a big gain advantage at very low takeoff angles for
> > the curtain array (it was, after all, very late in the evening on 15
> > meters when you would expect takeoff angles to be very low). Perhaps
> > someone should model this?
> >
> > 73 de Mike,
> > W4EF.............................................................
> >
>
> I always wondered how far back from the cliff overlooking the Pacific
> Ocean each antenna was. Could the beam have been reflecting off
> the ground before the edge of the cliff and the curtain array looking
> at the saltwater at an effective height of the supporting poles PLUS
> the height of the cliff?
>
> Tom N4KG
>
>
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