[time-nuts] GPS splitter measurements

paul swed paulswedb at gmail.com
Thu Oct 11 19:22:41 EDT 2012


Azelio,
Not at all the satellite splitters can be smart or passive. I use a passive
so it has 1 dc path. But all of the other ports have dc blocks built in.
The smarter units will direct the highest DC to the antenna. Its really
diodes and I stay clear of those. To smart for there own good.
Plus with 3.3v and 5 v... it gets messy. I actually use the whole thing as
a passive. Have a line amp ahead of the splitter to make up for splitter
loss. Feed it with its own supply that also feeds the antenna.
On some gps units you do have to add a dc load to trick them into believing
an antenna is connected.
Regards
Paul
WB8TSL

On Thu, Oct 11, 2012 at 7:15 PM, Azelio Boriani <azelio.boriani at screen.it>wrote:

> To test this kind of items, you have to play with DC-blocks and bias-tees.
> Rather tedious but necessary. I know as at times I have to test
> questionable GPS antennae that return after lightning strikes.
>
> On Fri, Oct 12, 2012 at 1:09 AM, paul swed <paulswedb at gmail.com> wrote:
>
> > Magnus what would the possibility be of measuring an 8 way satellite
> > splitter? The $7 wonders with dc pass through. That looks like a very
> nice
> > network analyzer you have.
> > Regards
> > Paul
> > WB8TSL
> >
> > On Thu, Oct 11, 2012 at 7:05 PM, Magnus Danielson <
> > magnus at rubidium.dyndns.org> wrote:
> >
> > > On 10/12/2012 12:16 AM, Azelio Boriani wrote:
> > >
> > >> Please take care that the S14WI is "smart": if it doesn't sense a DC
> > >> current on the antenna port then it reports that to the user ports
> and I
> > >> think it can even power off the internal amplifier, this can account
> for
> > >> the observed loss instead of the gain.
> > >>
> > >
> > > I did consider this. but did not have the time and energy to follow
> that
> > > up at the time. It was only when I got home that I could dig up the
> > > datasheet and manual of the S14WI. Didn't want to fry it in the lab.
> > >
> > > I rather do an incomplete lab quick and safe. I reports warts and all.
> > >
> > > I'll see if I get time to re-do it tomorrow.
> > >
> > > Regardless, I want to get things going. More people than me should be
> > able
> > > to do this.
> > >
> > >
> > > Cheers,
> > > Magnus
> > >
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