Since my homemade version did not turn out as well as I had hoped, I was
planning to have my local fab shop laser cut a rack panel for our "new"
LUCENT-SYMMETRICOM Z3810AS (KS24361)
Before break out the ruler, anyone have a dimensioned drawing of the
mounting and panel holes?
Martin A
Hi,
As you run the OCXO without the lock to the maser, what does it do then?
Can you probe the input before the loop?
The EFC Voltage is a consequence of the loop action, so sorting out what
is a oscillator thing and what is sourced by other things becomes much
easier by opening up the loop
Erik,
You also also test the issue by vary the slew-rate of the input signal.
The trigger circuit will convert voltage noise into time noise, and any
such leakage will become larger time for slower slew-rate.
You can look up Collins paper amongst others for zero-cross-detectors.
Combining
j...@febo.com said:
> Of course, many of the old units still work fine except for the rollover
> providing a bogus date, and external software can easily correct that.
If you tell it the date, it will do the right thing.
T220220205235450339
>From the status page:
GPS 23:55:19
The Z3801As that I have seen have the Motorola Oncore VP 6-channel
receiver which I think predates the UT+, and all have had the rollover
issue.
The problem with swapping in another unit is that unless it sufficiently
imitates the VP at startup, the Z3801A will throw an error and never get
I do not know what Z3801 uses for GPS.
I have several Motorola UT+ GPS modules running.
Older ones with V2 firmware suffer 1024 week rollover failure.
My units with V3.2 and V3.1 do 1024 week rollover correctly.
If you are able to communicate with your device using Lady Heather
she will correct
I think the problem with the Z3801 is that it expects to see specific
handshake things at startup, in Motorola binary protocol. Dropping in a
random GPS will result in a "No GPS" error.
John
On 2/5/22 12:44 PM, Keelan Lightfoot wrote:
Depending on who’s GPS chipset is being used, a fix
>
> You can also fix your software to add 1024 weeks until the date is past a
> magic constant. If your tools support it, you can get that date as the
> build
> date from when you compiled your software.
>
Then there's US patent 5,923,618: "Leap-second cure for 1999 GPS rollover
problem"
The
Depending on who’s GPS chipset is being used, a fix might be possible. I’ve
poked around inside the firmware of a number of Trimble receivers (so far three
generations of the 4000 series, and the Placer series). Because the first week
rollover occurred in 1999, any receiver made close to that
On Samstag, 5. Februar 2022 10:48:57 CET Julien Goodwin wrote:
> I /think/ it's using more power than it did before (right around 20W at
> total cold, dipping to 10W after a while), although silly me didn't make
> a note of it, but even after 30 minutes it's not locking.
The power starting high
On 5/2/22 2:58 am, paul swed wrote:
Julien
I don't think I would read a lot into the failed R just replace it. They
are in a nasty hot environment and simply can age and die. Get at leat 2
resistors just incase there really is a shorted transistor or something
else going on.
Regards
Paul
Oh
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