I use a multichannel vector voltmeter at the phasing network
during setup.
73, Tom W8JI
----- Original Message -----
From: "Michael Tope" <W4EF@dellroy.com>
To: "Tom Rauch" <w8ji@contesting.com>; "Jim Lux"
<jimlux@earthlink.net>; "Dan Levin" <dan@andlev.com>;
<towertalk@contesting.com>
Sent: Saturday, May 08, 2004 11:11 PM
Subject: Re: [TowerTalk] 4 Square phase line length question
> From: "Tom Rauch" <w8ji@contesting.com>
> To: "Jim Lux" <jimlux@earthlink.net>; "Dan Levin"
<dan@andlev.com>;
> <towertalk@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..................
>
>
>
>
> _______________________________________________
>
> See: http://www.mscomputer.com for "Self Supporting
Towers", "Wireless Weather Stations", and lot's more. Call
Toll Free, 1-800-333-9041 with any questions and ask for
Sherman, W2FLA.
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|