[time-nuts] basic question on GPS satellites

WB6BNQ wb6bnq at cox.net
Mon May 16 03:39:39 UTC 2011


Paul,

If you had read more carefully what I wrote you would see that I said better coax
"WHEN HE PUTS IT OUTSIDE."

thank you,

Bill....WB6BNQ


paul swed wrote:

> 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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