Hey guys,
I suspect we may have a Z3801A expert on the list.
A couple of nights ago, we had a power failure. GPSCON says that my
Z3801A has failed self-test, but everything else looks fine:
Self Test: Err
Int Pwr: OK
Oven Pwr: OK
OCXO: OK
EFC: OK
GPS Rcv: OK
The whole screen can be see
Perhaps I can do this in words, as I have no schematic software.
Start with the input to your favorite microprocessor's A/D converter.
Connect it to a suitable (more later) capacitor to analog ground.
Connect a cmos switch across the cap and call it S2. When S2 is on, it
discharges the cap.
Now b
On Tue, 22 Sep 2015 23:49:25 -0400
"Bob Benward" wrote:
> Continuing this discussion, I have included a PDF showing the past 30days of
> EFC. Amazingly, the drift has reversed direction! Anyone have any insights
> into this behavior? Each data point represents 10 seconds.
Vig and Meeker have
Hello,
I got some 4046 plls and I decided to implement the schematic given on:
https://www.febo.com/pipermail/time-nuts/attachments/20140211/8bdbc232/attachment-0004.jpg
in the drawing phase comparator 3 output is connected to a diode, which
then is fed to a network, and then read from an adc. I
Hi Dan,
I would love to see your data. 3E-12 is very impressive (I assume an
inferred drift from the EFC counts?). I am really surprised at the
oscillator turn around, nothing changed in my house or in the setup, so I
was surprised to see the sudden dip. At first I thought the oscillator was
agi
Do we have any Symmetricom experts on this list?
I've had a Symmetricom Syncserver S200 GPS+PPS with rubidium clock running for
several years until we had a power cut and the UPS battery failed, on powering
back up it won't boot at all.
I suspect the flash is corrupt but they protect it in some
kd5...@gmail.com said:
> When I command a self test via *TST? command, it returns 0, which is no
> error.
It runs all the tests again and didn't find any errors, but it remembers that
it has seen an error sometime recently that hasn't been cleared.
> Not sure why GPSCON is reporting a self test
Hi Chrs,
Not an expert… but usually computer systems give some indication of why a
boot is failing on the systems console. The S200 is probably a unix based
system as it has utilities such as SSH. TELNET. HTTP. So you could try
connecting an RS232 terminal , or telnet’ing to its console server
the role of the diode is just to have a voltage drop?
73
KJ6UHN
Alex
On 9/23/2015 11:31 PM, Bill Hawkins wrote:
Perhaps I can do this in words, as I have no schematic software.
Start with the input to your favorite microprocessor's A/D converter.
Connect it to a suitable (more later) capacitor
On 9/23/15 10:08 PM, Poul-Henning Kamp wrote:
In message <5602f65b.6050...@earthlink.net>, Jim Lux writes:
I've got a teensy3.1 hooked up to a 33120 function generator (not
exactly a super stable device) and generating period data for a 1 Hz
square wave.
That is actually a particular
On 9/23/15 2:50 PM, Magnus Danielson wrote:
Jim,
There is some systematic bumps in there which make me wonder what
happens here. Care to share data/plots for phase?
Sure..
This is just the part sitting on my desk with the source hooked up with
clip leads. The run is very short (5-10 minutes)
Hi
Simple approach:
Use a pair of tri-state buffers.
Both have their outputs hooked to the cap through resistors.
One (call it A) has its signal input grounded. The other (call it B) has
its signal input tied high. Both of the tri-state controls normal sit in the
“off” (= output is tri-state)
FWIW our SyncServer S250 has a PSU with an electrolytic cap that has failed
at least twice over the years:
http://www.anderswallin.net/2015/08/psu-electrolytic-cap-fix/
Anders
On Thu, Sep 24, 2015 at 10:21 AM, G1FEF wrote:
> Do we have any Symmetricom experts on this list?
>
> I've had a Symmet
On Thu, 24 Sep 2015 05:30:35 -0700, Jim Lux wrote:
>
> What would be interesting is if there's a pin on the Arduino/Teensy that
> you could feed a high quality oscillator to, and then do counting with
> that. The K20 microcontroller has a mindbendingly large number of
> features and alternate p
On Thu, Sep 24, 2015 at 10:14 AM, Jim Harman wrote:
> The diode prevents it from being discharged by the LS4046.
Sorry, I meant HC4046.
--
--Jim Harman
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Diode at HC4046 output pin 15 is 1N5711 (Schottky signal diode)
This is in series with 3900 ohm resistor.
Cap to ground is 1nf NPO ceramic
Resistor across the cap is 1 M
These values are suitable for the Arduino Uno (ATmega 328 processor) with
the analogReference set to INTERNAL. This gives the AD
S200s definitely shared the PSU issue. A rep from Symmetricom/MicroSemi
told me that the custom manufacturer had used a part which was not spec'd
properly (betting it was a cap).
I'd be surprised if the flash is corrupt. There's two compact flash cards,
each with a copy of the OS. Updates go to th
Hi Chris,
This is a Linux box - an x86 box in fact. As far as I remember they even
have VGA pin headers on the board inside. Boot it up with the serial
console active and see if you get anything meaningful, but I doubt it. I
opened one up for the same purpose last year but I don't have it to hand
I've had the same problem with an S300 so I gave up and started working on
a replacement. Eventually I'll get everything documented and offered to
the group, but far I've built a custom sheild for a BeagleBone Black with a
Furuno GT-8736 timing receiver, and it looks great so long as it's doing
no
xne...@luna.dyndns.dk said:
> External Oscillator (the system clock clock) , or External Timer clock
> (limited to system clock/4)
That sounds like they are running the external signal through a synchronizer
and then doing all the logic on the system clock. That would add a lot of
high frequ
This is profoundly cool, Paul! Thanks so much for this work.
I'm not making any promises, but I hope to lay out a PCB for the DBM
section and will make the gerbers available. If there's enough
interest, we might be able to do a group PCB order. Contact me off-line
about that.
John
On 9/2
On 9/24/15 7:13 AM, cfo wrote:
On Thu, 24 Sep 2015 05:30:35 -0700, Jim Lux wrote:
What would be interesting is if there's a pin on the Arduino/Teensy that
you could feed a high quality oscillator to, and then do counting with
that. The K20 microcontroller has a mindbendingly large number of
In a 2005 White Paper singing the praises of "their", actually ex Datum,
8130A rubidium module, Symmetricom mentioned a small RS232 utility they
referred to as 8130Comm.
However, it isn't mentioned in the 8130A manual and I can't find anything
else about it either online or within my own Sy
On Thu, September 24, 2015 7:30 am, Jim Lux wrote:
> What would be interesting is if there's a pin on the Arduino/Teensy that
> you could feed a high quality oscillator to, and then do counting with
> that. The K20 microcontroller has a mindbendingly large number of
> features and alternate pin fu
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