[TowerTalk] 4 Square phase line length question

[Tom Rauch]

I use a multichannel vector voltmeter at the phasing network
during setup.

73, Tom W8JI

----- Original Message ----- 
From: "Michael Tope" <W4EF at dellroy.com>
To: "Tom Rauch" <w8ji at contesting.com>; "Jim Lux"
<jimlux at earthlink.net>; "Dan Levin" <dan at andlev.com>;
<towertalk at contesting.com>
Sent: Saturday, May 08, 2004 11:11 PM
Subject: Re: [TowerTalk] 4 Square phase line length question


> From: "Tom Rauch" <w8ji at contesting.com>
> To: "Jim Lux" <jimlux at earthlink.net>; "Dan Levin"
<dan at andlev.com>;
> <towertalk at contesting.com>
> Sent: Saturday, May 08, 2004 7:23 PM
> Subject: Re: [TowerTalk] 4 Square phase line length
question
>
>
> > > Here's the interesting thing..I assume you're using
some
> > scheme where you
> > > use 1/4 wavelength lines for current forcing, right?
so
> > the element current
> > > will be what it should be, regardless of the element
> > impedance.  The
> > > mismatch at the feed eventually winds up back at the
> > hybrid/phasing network,
> > > where you can take it out by changing the L or C of
the
> > phasing network (or,
> > > just ignore it, and take it out at the array feed
point).
> >
> > Forcing equal currents requires equal input voltages and
> > correct input voltage phase. 1/4 wl away that becomes
equal
> > currents and with correct current phase.
>
> I hadn't thought about it before, but since the 1/4 wave
lines
> force equal feed currents for equal input voltages, one
could
> use a dual-trace oscilloscope at the phasing network/power
> splitter to set the relative amplitude and phase of the
element
> currents. Seems like that would make it really easy to get
> the array currents dead nuts on.
>
> 73 de Mike, W4EF..................
>
>
>
>
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