Ed,
If I have the math correct, and you are measuring the voltage to ground
through a 10 MegOhm input impedance DMM, you have about 7.5 nA beam current
which seems a bit low compared to what I remember of the HP 5061A. However,
you still have a definable 'peak' with a 'peak to valley' voltage of
I will agree with Joe. I have a CS tube thats darn near impossible to read
the beam current and yet it still locks. That truly amazes me. I seem to
recall other comments ages ago about that chip failing. There should be a
way to emulate it these days with all of the DDS chips and such that are
avai
On 03/05/2014 18:41, Tom Van Baak (lab) wrote:
Tony, Chris, Bert,
Since all you want is a 10 ns time stamp / data logger you do not need a GPSDO,
or OCXO, or VCXO.
The solution is cheap and very simple.
Your GPS receiver provides a 1PPS to the microprocessor. Use a plain XO or
TCXO; the freq
> The data loggers will be continuously powered, in fixed locations
> and should have reasonably good views of the sky so the use of a low
> cost GPS module should be feasible.
Hi Tony,
Ah, now you are asking a completely different question. When you started this
thread you didn't mention anyt
Tom,
Any progress on the Adafruit PPS study?
(Hope this isn't a dupe. Yahoo's mail scripts have problems today.)
Bob
>
> From: Tom Van Baak
>To: Discussion of precise time and frequency measurement
>Sent: Monday, April 28, 2014 1:56 PM
>Subject: Re: [time-n
Hi Ed,
On 05/05/2014 07:45 AM, Ed Palmer wrote:
I'm playing with my first Cs standard. It's a Datum 4065A which appears
to have a dead STEL-1173 synthesizer. Before I put too much effort into
replacing that, I thought I'd check the tube and see if it has any life
left. I've attached a chart s
On Mon, 05 May 2014 14:55:20 +0100
Tony wrote:
> On 03/05/2014 18:41, Tom Van Baak (lab) wrote:
> > Tony, Chris, Bert,
> >
> > Since all you want is a 10 ns time stamp / data logger you do not
> > need a GPSDO, or OCXO, or VCXO.
> >
> > The solution is cheap and very simple.
> >
> > Your GPS rece
Hi Joe,
I didn't realize that the info in the 5061A manual was somewhat
'generic'. Thanks for the pointer.
On 5/5/2014 6:20 AM, J. L. Trantham wrote:
Ed,
If I have the math correct, and you are measuring the voltage to ground
through a 10 MegOhm input impedance DMM, you have about 7.5 nA be
I know very little about today's DDS chips, but I think that emulating
the STEL-1173 would be a challenge. It provides 48 bit frequency
resolution. I counted 13 different frequencies that are used to monitor
the signal to make sure that it's on frequency. Based on the manual,
they were shifti
Hi
Is this the right chip:
http://www.oemstrade.com/search/STEL-1173%252FCL/
At $65 it is pricy but a bargain if it fixes your clock.
Thomas Knox
> Date: Mon, 5 May 2014 15:14:16 -0600
> From: ed_pal...@sasktel.net
> To: time-nuts@febo.com
> Subject: Re: [time-nuts] Datum 4065A Cs Tube Response
Ed,
On 05/05/2014 10:56 PM, Ed Palmer wrote:
Hi Joe,
I didn't realize that the info in the 5061A manual was somewhat
'generic'. Thanks for the pointer.
On 5/5/2014 6:20 AM, J. L. Trantham wrote:
Ed,
If I have the math correct, and you are measuring the voltage to ground
through a 10 MegOhm
Hi Tom,
Yes, that's the right chip, but the 'L' at the end means it's the DIP
package. The PLCC package has an 'M' instead of the 'L'. I also found
a lot of sellers on a far east site who have the DIP package (probably
used chips pulled from sockets), but none who have the PLCC package.
Th
Hi Ed:
Some links to the related patents are on my 4060 & 4065 web page:
http://www.prc68.com/I/FTS4060.shtml#Pat
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
Magnus Danielson wrote:
Ed,
On 05/05/2014 10:56 PM, Ed Palmer wrote:
Hi Joe,
I d
Hi Magnus,
On 5/5/2014 3:30 PM, Magnus Danielson wrote:
Ed,
On 05/05/2014 10:56 PM, Ed Palmer wrote:
Hi Joe,
I didn't realize that the info in the 5061A manual was somewhat
'generic'. Thanks for the pointer.
On 5/5/2014 6:20 AM, J. L. Trantham wrote:
Ed,
If I have the math correct, and yo
The original price of the STEL1173CL was $ 125 in quantity 10 so $ 65 is a
bargain. I have no idea as to how it is used in the 4065A but if it is
limited to 13 frequencies it may be worth wile to take a look at the AD 9913
it is capable to produce very precise frequencies exceeding its 32 bi
The datasheet can be easily found with google. The functionality is very
simple, it could be emulated with a CPLD+small memory or with an small
FPGA (maybe the newer CPLDs from Altera.. they are FPGAs inside... and I
think they have block RAM). But if you can still buy it in another
package i
On Mon, May 5, 2014 at 6:55 AM, Tony wrote:
>
> Yes - that is exactly what I intended. The problem though is maintaining
> sufficient accuracy during periods when the GPS clock is unavailable or
> unreliable (perhaps due to local interference), but I don't have any handle
> on how long that may b
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