[time-nuts] basic question on GPS satellites

J. Forster jfor at quik.com
Sun May 15 20:23:22 EDT 2011


Hi Gene,

Unlikely. Leaves, wet or dry, are a killer. Get a longer pole for the
antenna.

-John

==============

> Hi Paul.  No, the antenna is not above the tree line.  Leaves are wet
> today,
> but on dry days similar.  Curious: the unit puts out "5V" to the antenna.
> If
> this is 4.7 or lower, could this affect the degree of amplification the
> amp
> built into the antenna might develop? Should I find the power supply and
> make sure its tuned up to 5V?
>
>
>
> The antenna I am using is: "Symmetricom 58532A GPS L1 Reference Antenna"
> According to the paperwork, the operating voltage should be 5V +/- 0.5V so
> I
> am within spec. But I wonder if a little more juice, to say, 5.25 might
> give
> better amplification?
>
>
>
> 73 Eugene W2HX
>
>
>
> From: paul swed [mailto:paulswedb at gmail.com]
> Sent: Sunday, May 15, 2011 8:00 PM
> To: Eugene Hertz; Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] basic question on GPS satellites
>
>
>
> Shouldn't be doing it that fast
>
> Would indicate a poor signal level might be my guess.
>
> Is your antenna above the tree line?
>
> Wet leaves can be nasty at 1.5 Ghz
>
> Regards
>
> Paul
>
> WB8TSL
>
> On Sun, May 15, 2011 at 6:30 PM, W2HX <w2hx at w2hx.com> 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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