Carl,
Thanks for the info.
However, it looks like my setup's viability was short lived. I got up this
morining and noticed that the clock was in holdover mode. I checked the
softtware and it's not tracking any sats. It went into holdover mode around
1am. Do sky conditions affect GPS reception? Any suggestions on how to
troubleshoot the installation? The clock's health status says OK. The
display currently lists 7 sats and it's trying to track 6 of them.
Does a sat displayed in the 'not tracking' column indicate it hears the sat
or does it just think that the sat should be there?
73,
Mark
----- Original Message -----
From: "Carl Moreschi" <n4py@earthlink.net>
To: <tentec@contesting.com>
Sent: Wednesday, June 25, 2003 21:13 PM
Subject: Re: [TenTec] GPS Antenna feedline
> You need to tell the GPS receiver the antenna feedline delay in nanosecs.
> For free space, light travels at 11.8 inches in 1 nansecond. If the coax
> has the hard tpye insualtion material in it, its propagation factor is
66%.
> If the coax has foam insolation, its propagation delay factor is 82%. So
if
> you take the length of the coax in feet and divide it by either 0.66 or
0.82
> , you will get the total delay in nanoseconds.
>
> So 50 feet of coax with hard insolation will be 75 nanoseconds delay. Now
> all you have to do is tell the GPS receiver what your antenna delay is.
In
> the "Control and Query" window, select "Antenna delay" to send the
command.
>
> Carl Moreschi N4PY
> Franklinton, NC
> ----- Original Message -----
> From: "Mark Erbaugh" <mark@microenh.com>
> To: <tentec@contesting.com>
> Sent: Thursday, June 26, 2003 12:48 AM
> Subject: Re: [TenTec] GPS Antenna feedline
>
>
> > Well, I got things working! I took a piece of RG8X because I had it
some
> > and attached BNC connectors to both ends after running it through the
> house
> > band board into the shack. I used an old PC network BNC T ( again
because
> I
> > had one ) connector as a splice between the BNC on the antenna and the
> > extension.
> >
> > The signal strengths ( I assume that that is the SS column on the
SatStat
> > display - with the clock outside, directly connected to the antenna I
saw
> > numbers peaking around 160, this evening the highest is about 70 ) are
> down,
> > but the clock was able to track 6 satellites in about 15 minutes. Now
to
> > let the clock stabilze.
> >
> > This is probably in the manual, but do I need to adjust for the
additional
> > length of coax that I added? Is there a way to let the clock figure that
> > out?
> >
> > 73,
> > Mark
> >
> > _______________________________________________
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> > TenTec@contesting.com
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>
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