[TenTec] HP GPS Receiver

[Eric F. Richards]

At 05:53 PM 6/22/2003 +0000, you wrote:
>Mine reads  1 PPS -4.7 ns.  I'd say thats pretty good.  No where do I see
>the words "Frequency Stable" on the screen.

And you won't.  It will drift around "perfect" and attempt to stay that
way but even with an oven, it will be affected by temperature, etc.

It also will drift off if it loses lock with the GPS signals.  If you
are having trouble holding lock for any length of time, that might make
it more difficult to keep "adjusting" the local oscillator to be more
accurate.

If you use K8CU's software, there are plots available that chart the
clock's performance over time.  To see all the plots at once, use a
web browser and look at page:

         "C:\Program Files\GPSCon\gpsstat.htm"


>As far as how practical this is, I would say almost none.  But I find the
>whole thing very interesting and enjoyable to do.  Sounds like the things a
>good hobby should supply.

Yeah, what he said.

Eric


>Carl Moreschi N4PY
>Franklinton, NC
>----- Original Message -----
>From: "Paul Christensen, Esq." <w9ac at arrl.net>
>To: <tentec at contesting.com>
>Sent: Sunday, June 22, 2003 1:33 PM
>Subject: Re: [TenTec] HP GPS Receiver
>
>
> > After 24 hours, the best 1PPS TI  I can achieve is about +100ns even with
> > the GPS lock indicator on.
> >
> > Although accuracy into the Ten Tec RX-340 is still excellent, the margin
>of
> > error is still no better than 1X10-7 which is far out of spec.  What type
>of
> > TI readings are the rest of you seeing?   Also, after a period of time
>does
> > your SatStat receiver status indicate "frequency is stable?"
> >
> > Private reply is probably best.
> >
> > Thanks,
> >
> > -Paul, W9AC
> >
> > ----- Original Message -----
> > From: "Jim Reid" <jimr.reid at verizon.net>
> > To: <tentec at contesting.com>
> > Sent: Saturday, June 21, 2003 14:40 PM
> > Subject: Re: [TenTec] HP GPS Receiver
> >
> >
> > >
> > > > I think it's pretty much conclusive that there is absolutely
> > > > zero benefit to modify the internal COMM port jumpers to
> > > > RS-232.
> > >
> > > Am glad I didn't try,  hi.
> > >
> > > > Now that that's off my chest, the satellites are tracking fine...
> > >
> > > > I am assuming that the "GPS LOCK" lite on the HP unit will
> > > > light up after the survey is complete?
> > >
> > > That is correct;  and after that occured,  and the light remained
> > > on for a time,  I disconnected the cable linking the hp
> > > unit to my PC.  I returned the PC port to my rig as a CW
> > > keying port,  PSK31,  etc.  So far,  have found no need to
> > > "look" at the sat rcvr status;  guess no point in it, as long
> > > as the Lock light stays ON,  hi.
> > >
> > > 73,  Jim  KH7M
> > >
> > >
> > >
> > > _______________________________________________
> > > TenTec mailing list
> > > TenTec at contesting.com
> > > http://lists.contesting.com/mailman/listinfo/tentec
> >
> > _______________________________________________
> > TenTec mailing list
> > TenTec at contesting.com
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>
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--
Eric F. Richards
efricha at dimensional.com
"The weird part is that I can feel productive even when I'm doomed."
  - Dilbert