Just wanted to mention that I've been making C-field adjustments on my
5061A for the
last few weeks while monitoring its performance vs. the Z3801A. I've
had quite a few
large ESD events after shuffling across the carpet and down the basement
stairs where
the discharge went directly to the C-fi
I had a similar experience about 2 weeks ago My (sirf chip set) gps lost
lock. It was in the afternoon around 1-3 pm I will have to check my logs
for the exact date and time.
The fed's like to jam gps from time to time around sensitive gov
installations the area can be quite large at high altitudes
Bill Hawkins wrote:
Well, if you figure out how to introduce a 100 mS delay with a
short length of cable, you should see a patent attorney.
Wait a minute. Aren't you using a homebrew divider to get 1 PPS
from the 5061? That's a fine way to get long lasting offsets, but
I can't imagine why it curved
Well, if you figure out how to introduce a 100 mS delay with a
short length of cable, you should see a patent attorney.
Wait a minute. Aren't you using a homebrew divider to get 1 PPS
from the 5061? That's a fine way to get long lasting offsets, but
I can't imagine why it curved up or why the offs
Doug Hogarth said,
"I don't know your particular GPS, but sure looks to me like GPS lost lock
(started drifting), then somehow got bad lock twice, before finally getting
proper lock. So I'd study GPS antenna/cable and receiver settings.
Consider adding logging of some GPS status, or at least try
All --
Thanks for all the comments. It must be a slow afternoon/evening!!!
You've given me several things to check out. In addition, as I was
looking at the hardware in the basement I now have a suspicion that it
might be a cable problem, specifically in the cable that goes from the
5061A PPS
Just because something isn't probable doesn't mean it isn't
possible. Given that the "normal" light was still on, either
the light logic is faulty or the 5061 never lost lock. That
leaves the GPS receiver, antenna and signal path. That it
happened at about the time the adjustment was moved could
be
I don't know your particular GPS, but sure looks to me like GPS lost lock
(started drifting), then somehow got bad lock twice, before finally getting
proper lock. So I'd study GPS antenna/cable and receiver settings.
Consider adding logging of some GPS status, or at least try to enable
setting for
Mike S wrote:
At 04:58 PM 3/24/2005, John Ackermann N8UR wrote...
That's a good hypothesis, but given how long this system (same receiver and antenna) has been running without ever encountering something like this makes me doubt it's a GPS anomaly, or at least a local one.
Were you talking
John Miles wrote:
How's the ESD environment in the room with your 5061A? Was there a spark
when your wife touched the knob (no double-entendre intended)?
-- john KE5FX
Har! Excellent thought, but I don't think ESD is likely, though it
can't be ruled out. The floor is linoleum over concrete b
At 04:58 PM 3/24/2005, John Ackermann N8UR wrote...
>That's a good hypothesis, but given how long this system (same receiver and
>antenna) has been running without ever encountering something like this makes
>me doubt it's a GPS anomaly, or at least a local one.
Were you talking your wife throug
Hi John,
Try doubling what you have seen by disconnecting the antenna, and
substituting it by a resistor that makes aprox. the same current.
Hubert
-Ursprüngliche Nachricht-
Von: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Im
Auftrag von John Ackermann N8UR
Gesendet: Donnerstag, 24. März 2
> Hi Hubert --
>
> That's a good hypothesis, but given how long this system (same receiver
> and antenna) has been running without ever encountering something like
> this makes me doubt it's a GPS anomaly, or at least a local one. A long
> history has shown that this receiver/antenna very seldom
Hubert v. Bonhorst wrote:
Hi John,
I saw similar outliers running especially Motorola GPS receivers in the
vicinity to mobile telephones. Shielding is not sufficient. What I see in
your data plot is a drifting oscillator until the receiver tries to find a
new satellite configuration. (sudden jump
Hi John,
I saw similar outliers running especially Motorola GPS receivers in the
vicinity to mobile telephones. Shielding is not sufficient. What I see in
your data plot is a drifting oscillator until the receiver tries to find a
new satellite configuration. (sudden jump upwards). After some time
Hubert v. Bonhorst wrote:
If you disregard this excursion, what happened after the change. Did
frequency change as expected? Would there have been continuity of data?
Which TIC do you use? Which GPS receiver do you use? How many satellites did
you track? What is the minimum elevation for satellites
If you disregard this excursion, what happened after the change. Did
frequency change as expected? Would there have been continuity of data?
Which TIC do you use? Which GPS receiver do you use? How many satellites did
you track? What is the minimum elevation for satellites used?
I know a lot of stu
Poul-Henning Kamp wrote:
In message <[EMAIL PROTECTED]>, John Ackermann N8UR writes:
Anyway, has anyone seen anything like this, or have any idea what might
have happened here?
Did she leave the door open while she did the change
Good question, but there's no sign of a temperature chan
In message <[EMAIL PROTECTED]>, John Ackermann N8UR writes:
>Anyway, has anyone seen anything like this, or have any idea what might
>have happened here?
Did she leave the door open while she did the change ?
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
[EMAIL PROTECTED] | T
While I was out of town for the last week, I continued an experiment to
check the C-field sensitivity of my 5061A. I measured the offset at
C-field settings of 5.00, 5.50, and 4.50.
The last change was made while I was out of town. My wife, Jody, made
the change from 5.50 down to 4.50. She a
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