When cophasing two antenna's I think they usually use 1/4 Waves of 75 Ohm or
35 Ohm cable. If you feed it with 50 ohm cable, the harness that is, you
will have 100 Ohms at the feedpoint. So then you need something to change
that. In building an eme array, we used 1/4 and 1/2 waves of 50 ohm cable,
but they had to be exact.
Mathew
----- Original Message -----
>
> When we co phased 2 11M. Antennas we used a Phasing Harness RG-59/U coax
is
> what the sellers had I recalled they were 1 / 4 wave length apart, I
presume
> thats the case with the Sinclairs using a 1 /4 wave to 1/2 wave config.
> each cable that is to PL or N connector ( never did it w/ N BTW ) the
cable
> may be a different type also .
>
> anyone want to input on this ??
>
> Mark Holman, CRO
> AB8RU
> ----- Original Message -----
> From: "VA3EXT" <[EMAIL PROTECTED]>
> To: <Repeater-Builder@yahoogroups.com>
> Sent: Thursday, November 25, 2004 5:43 PM
> Subject: [Repeater-Builder] Co-Phasing two Sinclair SRL-210C4 repeater
> antennas
>
>
> >
> >
> >
> > I wondered if anyone could give me some ideas on co-phasing two
> > Sinclair SRL-210C4 repeater antennas together.
> >
> > They both have 50ohm impeadence.
> >
> > I think you would just use odd 1/4 wave electrical harness between the
> > two. I know how to calculate the lenght of the coax.
> >
> > I have one top mounted with 1/4 wave spacing from the mast on my 200'
> > tower that enhances the gain the way the dipole face, north. I have
> > another 1/2 wave spacing from the mast and want extra gain twards the
> > east-west which I would mount on the side of the tower below the
> > other.
> >
> > How far apart should the bottom element of the first antenna and the
> > top element of the second antenna?
> >
> >
> > ....Thanks, Scott VA3EXT
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
>
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>
> Yahoo! Groups Links
>
>
>
>
>
>
>
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