hol...@hotmail.com said:
> Besides temperature compensation for holdover conditions you should also
> include drift compensation for OCXO aging. The Trimble GPSDOs, HP 38xx
> and 53xxx GPSDOs, and Oscilloquartz Star-4 do this.
Does any of the HP gear have a temperature sensor? If so, how
One way I like to put it is like you when I start it in ham radio I
immediately considered WWV as the answer to everything TimeWise.
But for me around about 1975 I worked at General Electric space flight
systems. One could say I became a Time nuts then and discovered that what I
thought what is a
I'm in Silicon Valley. I'm logging some data from a Z3801A and a KS-24361.
I have a poor antenna location. I'm used to the Z3801A dropping into holdover
every few days when it can't find any satellites. Less often for the KS-24361.
I noticed some strange activity in the past few days. The
Actually. I have 6... And a large assortment of directional antennas of many
flavors LPDA, Horn etc,I have to get out there and find the interfering
source.
Cable company has been having problems with ‘booster’ amplifiers installed by
homeowners to ‘clean up’ noisy DTV signals. So just
You using a mother board serial port or a USB adapter? Not all USB/RS232
adapters are created equal. Drivers for brand "X" vs brand "Y" can make
a difference,. I would go down in the lab to see what I have that is
currently working but it is at least 5 years old and you wouldn't likely
find
The following are active GPS NOTAMs.
Data Current as of: Tue, 04 Sep 2018 19:16:00 UTC
GPS GLOBAL POSITIONING SYSTEM [Back to Top] !GPS 09/009 (KNMH A0020/18)
GPS NAV PRN 02 OUT OF SERVICE 1809061455-1809070255
ZAB ALBUQUERQUE (ARTCC),NM. [Back to Top] !GPS 08/259 (KZAB A0367/18) ZAB
NAV GPS
Re: Trimble Thunderbolt Start Up RS-232 Communications Glitch
Hello to the Group,
Would anyone be able to help provide a bit of insight
or experience in dealing with what I call the an initial
Trimble Thunderbolt GPSDO RS-232 communications glitch
(during initial power on/up).
I've noticed
Scott & John,
Do either of you have any activity by "Light Squared" (or whatever it's now
called) in your area. Jamming does not always have to be in-band to be
effective.
Dana
On Tue, Sep 4, 2018 at 1:11 PM Scott McGrath wrote:
> My TrueTime DC-XL has lost lock since yesterday as has my
Folks:
GPS jamming and spoofing isn't really my area of expertise, but it's something
I worry about, not just for its impact on geolocation and navigation
applications, but also because GPS has become critical as a high precision
timing reference in the telecommunications realm, which *is* my
Besides temperature compensation for holdover conditions you should also
include drift compensation for OCXO aging. The Trimble GPSDOs, HP 38xx and
53xxx GPSDOs, and Oscilloquartz Star-4 do this. Oscilliquartz calls it ATDC
(Automatic Temperature and Drift Compensation). For many OCXOs
> The challenge seems to me to be
how to temperature stabilize the entire DAC chain without putting it all in
an oven
Hi Forrest,
Generally you don't have to temperature stabilize the DAC because it is
inside the phase-locked control loop and the loop will adjust for
temperature dependencies,
Thanks to everyone who has responded so far.
My underlying interest is learning about 1PPS holdover methodologies in the
presence of environmental changes (think outdoor day/night temperature
cycles). My thoughts are that there are two ways that seem obvious to me
to implement a
12 matches
Mail list logo