[time-nuts] basic question on GPS satellites

[paul swed]

12' of rg 58 should be fine and 5-3.7V should work
In the thread it says this is using a window. Boy some windows actually can
block the signal especially if there is a screen.
Some one else said you need a view to the south. Thats a fact from ma. at
least interesting to watch the sat tracks. I would not have believed they
travel the way they do.
Strongly believe you need to see clear sky. Signal to noise ratio.
Lastly its late forgive typos.

On Sun, May 15, 2011 at 11:01 PM, WB6BNQ <wb6bnq at cox.net> wrote:

> Hi Eugene,
>
> I will presume from your call sign that you are North of the equator.  Thus
> you
> would want to have the best visibility (i.e., clear) pointing to the South.
>  The
> fact that you are at the window, on the inside, does limit the amount of
> sky you
> can see.  Just getting it on the roof will make a reasonable difference.
>  Getting
> above, or reasonably at the same height as, the trees should be the goal.
>
> I would use something better then RG-58 when you put it outside.  Even RG-6
> with
> quality connectors, the good type used by the cable TV companies, is better
> than
> RG-58 at the GPS frequency.
>
> As for increasing the voltage to the antenna, I would definitely be careful
> there.  No doubt a regulator of some sort is used up at the antenna and
> raising
> the voltage would just make that regulator work harder.  If the voltage is
> well
> lower than the specified 5 volts, I would investigate why that is.  Could
> be your
> meter is off ?  The only reason for raising the voltage a TAD would be if
> you had
> a very long run (like over 200 feet) to compensate for I*R losses if they
> are
> significant.  However, such a long run would be counterproductive due to
> line
> loss at the RF frequency of the GPS.
>
> 73....Bill....WB6BNQ
>
> W2HX wrote:
>
> > Length is about 12', type is RG-58, antenna is at my window pointing to a
> > some blue sky (no splitter). I think from the emails from the folks on
> the
> > list, before anything, I need to find a better location for the antenna.
> > Thanks for the reply
> >
> > 73 Eugene W2HX
> >
> > -----Original Message-----
> > From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> > Behalf Of Scott Mace
> > Sent: Sunday, May 15, 2011 10:07 PM
> > To: time-nuts at febo.com
> > Subject: Re: [time-nuts] basic question on GPS satellites
> >
> > What type of coax are you using and how long is the run?
> >
> > I live in the woods and my antenna is partially blocked by
> > trees to the north and east and have never had problems.  I have about
> > 130ft of LMR-400 between my antenna and splitter.
> >
> >         Scott
> >
> > On 05/15/2011 05:30 PM, W2HX wrote:
> > > Hi there. Recently acquired my first GPSDO. It is a datum 9390 (thank
> you,
> > > Norm!).  One aspect of its behavior seems strange to me.  Within a
> matter
> > of
> > > a few minutes, it seems that satellites are appearing and disappearing.
> > Are
> > > the satellites moving that quickly?  I might go from 1SV to 3SV or 4SV
> and
> > > then a minute later go to 1SV or none.  The antenna isn't moving and
> the
> > > trees aren't moving too much today.  I have not done anything with
> regard
> > to
> > > setting minimum elevation or any other parameters.  I did go through
> the
> > > COLD RESTART procedure to clear out everything and let it start from
> > > scratch.
> > >
> > >
> > >
> > > Do other GPSDO users experience something like this?
> > >
> > > 73 Eugene W2HX
> > >
> > >
> > >
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