For those of you who aren't familiar with it, the Exploratorium is the great
grandaddy of the hands-on science museums. It was started by Frank
Oppenheimer way back in 1969.
Anybody nutty enough to be on the time-nuts list would have a great time
there. They welcome big kids as well as
Hi Alec,
Well done and thanks for the credit. I had not looked under the board for the
crystal or spotted the divider.
One comment. in your blog and ebay description you say that the unit runs on
15V. The M suffix 5650A is actually designed for a normal aircraft 28V DC
supply (typical
Hi Alec,
Well done and thanks for the credit. I had not looked under the board for the
crystal or spotted the divider.
One comment. in your blog and ebay description you say that the unit runs on
15V. The M suffix 5650A is actually designed for a normal aircraft 28V DC
supply (typical
Hi,
I would like to know if there is a way to know if a Rubidium is at his end of
life or not : when it stops working, does this happen suddenly or are there
percursory symptoms ?
I am looking fora method that does not need to open the case (I have a 5680A
and I am waiting a Racal Dana).
the DAC1220 is definitely worth a second look. Two wire opto coupling makes
it even better. On my next PCB run there will be a test circuit. Thank you
for the hint.
Bert Kehren
In a message dated 4/19/2013 9:44:32 A.M. Eastern Daylight Time,
herb...@13thfloor.at writes:
On Fri, Apr 19,
On 20/04/13 10:03, Robert Atkinson wrote:
Hi Alec,
Well done and thanks for the credit. I had not looked under the board for the
crystal or spotted the divider.
One comment. in your blog and ebay description you say that the unit runs on 15V. The M
suffix 5650A is actually designed for a
Hi Alec,
I'm an expert searcher ;-). I actually searched for FE-5650 and NSN (NATO Stock
Number or National Stock Number to Americans) and then plugged the NSN into
Webflis. There are lots of websites out there that trawl for part numbers and
NSNs and then try to charge you for information that
http://w1mx.mit.edu/flea-at-mit
-John
==
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In my experience with numbers of less expensive cel tower pulls, they blink
out and re-ignite and then relock this is infrequent. But occurs more and
more often. If RB is suspected of going to the darkside, I use the
blink-ometer to catch this.
What the heck is a blink-ometer?
Simply one of those
On 4/20/2013 1:59 AM, Hal Murray wrote:
For those of you who aren't familiar with it, the Exploratorium is the great
grandaddy of the hands-on science museums. It was started by Frank
Oppenheimer way back in 1969.
Anybody nutty enough to be on the time-nuts list would have a great time
there.
I have noticed Z38XX constantly sends:
:PTIME:TCODE FORM F2
Reading the documentation, this is a NVRAM command - it is supposedly written
to NVRAM each time it is issued.
Wouldn't this eventually wear the NVRAM out if Z38XX left running for long
enough?
Or perhaps it only writes when the
Wouldn't this eventually wear the NVRAM out if Z38XX left running for long
enough?
The static format spec, not the dynamic time code, is written to NVRAM; read
once per reboot.
/tvb
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Tom it would indeed wear out the NVRAM especially the vintage used in the
old 3801. I think that was circa 1998?
On Sat, Apr 20, 2013 at 3:01 PM, Tom Van Baak t...@leapsecond.com wrote:
Wouldn't this eventually wear the NVRAM out if Z38XX left running for
long enough?
The static format
Looked up the DAC1220 and thats a very nice chip for ~$8.
Amazing 20 bit resolution and easy to hook up.
Regards
Paul
WB8TSL
On Sat, Apr 20, 2013 at 6:00 AM, ewkeh...@aol.com wrote:
the DAC1220 is definitely worth a second look. Two wire opto coupling makes
it even better. On my next PCB run
There's a very nice picture of a pinwheel from Novatel on the back cover
of the March issue of GPS world..
Has anyone a digital (or scanned) copy of that picture?
It's kind of difficult (i.e. impossible) to get GPS world at the shops here.
If I didn't throw the issue into the recycle bin,
where did you find it for $ 8?
Bert
In a message dated 4/20/2013 3:48:08 P.M. Eastern Daylight Time,
paulsw...@gmail.com writes:
Looked up the DAC1220 and thats a very nice chip for ~$8.
Amazing 20 bit resolution and easy to hook up.
Regards
Paul
WB8TSL
On Sat, Apr 20, 2013 at 6:00
I looked at the DAC1220 first, but in an EFC application it worries
me to no end that it is a Sigma-Delta DAC.
Even if I feed it a clock divided down from the OCXO you're EFC'ing,
to avoid beatfrequency effects, I would still worry about harmonic
effects and noise.
Also, the noise-spec is
Sorry, I misunderstood what you mean by Z38XX. I thought that meant the
generic class of HP / Agilent / Symmetricom Z38xx (aka Z38* or 585*) GPS
receivers, of which there are many.
If you are referring instead to the freeware Windows Z38XX.exe program, then
that indeed sounds like a horrible
On Sat, 20 Apr 2013 20:14:06 +, Poul-Henning Kamp
p...@phk.freebsd.dk wrote:
I looked at the DAC1220 first, but in an EFC application it worries
me to no end that it is a Sigma-Delta DAC.
Even if I feed it a clock divided down from the OCXO you're EFC'ing,
to avoid beatfrequency effects, I
On Sat, Apr 20, 2013 at 08:14:06PM +, Poul-Henning Kamp wrote:
I looked at the DAC1220 first, but in an EFC application it
worries me to no end that it is a Sigma-Delta DAC.
Even if I feed it a clock divided down from the OCXO you're
EFC'ing, to avoid beatfrequency effects, I would still
Hi Mark,
I looked in the manual, but I can't see where it says that the command
is written to NVRAM. Where did you find that?
Ed
On 4/20/2013 11:53 AM, Mark C. Stephens wrote:
I have noticed Z38XX constantly sends:
:PTIME:TCODE FORM F2
Reading the documentation, this is a NVRAM command -
'scuse me, i am mobile at the moment, I think it was 58503 manual.
But it is easy enough to prove as what one set the time format (f1 or f2) to is
persistant across a power cycle.
Mark
Sent from my iPad
On 21/04/2013, at 10:01, Ed Palmer ed_pal...@sasktel.net wrote:
Hi Mark,
I looked in
Bert
I was looking at your price in the leading email. You had ~$8. So thats
what I thought it was.
I may have misread it sorry.
Regards
Paul
WB8TSL
On Sat, Apr 20, 2013 at 7:59 PM, Herbert Poetzl herb...@13thfloor.atwrote:
On Sat, Apr 20, 2013 at 08:14:06PM +, Poul-Henning Kamp wrote:
Just a couple of comments from a RF guy and FMT-nut
10 MHz clock distribution for the lab
In the small coax cables one might consider RG-223. This is a 1/4 inch more or
less diameter cable that features two concentric braided shields. Each is a
very dense weave and is silver plated.
Will T-Bolt Mon work in Windows 7 ?
Thanks, Dick, W1KSZ
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I'm evaluating a Jackson GPSTCXO that was in a Symmetricom Eval Kit.
It's showing impressive perfomance with just the antenna in the window.
I'm using either the Z38xx or GPSCon software. Are there commands that
would allow me to
1. Force the receiver to do a self-survey and/or
2. Force the
Hi Tom,
Sorry, that unit is using an AMY GPS, which does not support Position Hold or
Auto Survey mode.
You can however set longer time constants by reducing the serv:efcs parameter
if the unit is shielded from all airflow. That can reduce the ADEV at 10s to
1000s.
Bye,
Said
Sent From
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