Good image.
So, if I read that right it is a pulse about 1 uS wide and goes from
base of zero volts to about 5.8 V.
Curious why the high level is over 5 V? Is your 5 V supply to the
Rubidium unit up there?
On 2/3/2012 8:52 PM, Bob Bownes wrote:
Just for completeness sake, here is a
The probe compensation could be off.
What type of vertical plug-in was used? The Tektronix 11000 series of
oscilloscopes scare me.
On Sat, 04 Feb 2012 00:36:13 -0800, Rex r...@sonic.net wrote:
Good image.
So, if I read that right it is a pulse about 1 uS wide and goes from
base of zero volts
On 2/4/2012 12:17 AM, John Miles wrote:
In the current 5680A units, the 10 MHz output comes from the 60 MHz VCXO
(divided by 6 in CPLD) and not direct from a DDS. If my architecture
understanding is right, the DDS signal output is mixed with the VCXO
output
only at the 114th harmonic of 60
From your comments, it sounds like you may be measuring one of the
earlier 5680A's that could be tuned over a large range with a DDS output.
These earlier ones had a 50.25 MHz internal osc which was locked after
multiplication to the rubidium frequency. Then there was a DDS on the
output
Hello, John,
Your phase noise plot seems quite similar to that sent by Said some time
ago (4 Jan), that looks like a lot of spurs quite evenly separated. It
is likely from the price and p/n that your unit is one of the newer
ones with 60MHz xtal and the DDS inside the loop - and I would think
Maybe his are new. But I bought one from ggg*fitting that was listed as new
turned out very used, and in conversation with them they had to admit they
do not know what they have. If it still has its original factory setting,
measuring the frequency will tell you if it had extensive running
John
Thank you for your effort. It would be nice if you could confirm the 4 to 5
Hz dither that seems to be the loop time constant and long term aging that
will influence the GPS/Rb control loop time constant setting. I did see 1
E-12 per month which may be unique to that unit.
Bert Kehren
On 04/02/12 04:19, John Miles wrote:
Someone earlier today made the point that for all the talk about the FEI
rubes, there hasn't been any real performance info posted. That prodded
me to start an experiment I've been meaning to do for a while. I have
samples of all three of the common telco
On 02/03/2012 10:35 PM, Bob Smither wrote:
Thanks Rob Kimberley!
The manual that Rob found (Technical Manual TM 5680-0211) is available here:
http://c-c-i.com/node/166
Thank you Rob and Bob!
Cheers,
Magnus
___
time-nuts mailing list --
On 2/3/2012 3:40 PM, J. Forster wrote:
In theory only. I have been on both FaceBook and LinkedIn Do Not Contact
lists, and I got another spam within the last two days.
That may merely be phishing. I've seen quite a few lately, which are
made to look like they originate from LinkedIn, but
Stanley,
Thanks for your efforts. I think I'm getting closer but still not what I
remember. It must have been a couple of years ago or more.
Seems there was a picture of the two units installed in their 'tray',
interconnect wiring in place and notes about the pinouts and connections.
I
Sorry for the cross-post, but I know this is of interest to some folks
on the HPSDR (high performance software defined radio) list, and I
suspect it may be helpful for some time-nuts as well.
The important message first: the little PicoPSU switching power
supplies that plug directly into an
In message 4f2d8b77.6040...@febo.com, John Ackermann N8UR writes:
The important message first: the little PicoPSU switching power
supplies that plug directly into an ATX socket say they are for 12V
input. It turns out that they mean it
That depends on the model of PicoPSU.
Some of them are
Thanks for that info, Poul-Henning. If I hadn't already bought several
of the standard supplies, the wide-range ones sound like the perfect
option. I didn't dig deeply enough when I ordered the systems (and
didn't discover the problem until now because they seemed fine on my
13.8V supply; it
There are supplies for those mini ITX boards that are designed for a wide
voltage range, that is to be powered from a car. I don't have the exact model
number in front of me, but that is the kind I used in my Atom.
I bought it here:
http://www.mitxpc.com/
These mobile supplies can initiate a
Bob Smither wrote:
Thanks Rob Kimberley!
And now thanks to fellow time-nut Louie Mamakos there is a copy that is search
able. Here is how he did it:
Just for grins, I ran your PDF file through Adobe Acrobat to OCR it (and
clean it up slightly). The image is still there, but the OCR'd text is
On Sat, 04 Feb 2012 14:48:07 -0500, John Ackermann N8UR wrote:
Finally, I found a manual for the PicoPSU on the web, and discovered
that when they say it's a 12V supply, they mean it -- there is an
overvoltage shutdown that's supposed to trip between 13.0 and 13.5
volts. In practice, it
Hi
The short term plot on the FE's follows a straight line from 1ms out to 100
sec. No bumps close in.
Bob
On Feb 4, 2012, at 6:23 AM, ewkeh...@aol.com wrote:
John
Thank you for your effort. It would be nice if you could confirm the 4 to 5
Hz dither that seems to be the loop time
I was hoping that pulling the lock LED from my setup would clear up my PPS
signal, but no luck. I'm now getting a 4.545Khz sawtooth with 10Mhz noise. I
need to peek at the input to the 74AC240.
-Dave
- Original Message -
From: Attila Kinali att...@kinali.ch
To: Discussion of precise
I'm in the habit of using things like:
cat /dev/ttyUSB0
when checking out GPS that I expect to send ASCII.
When I tried that with my new toy, it went bonkers. In particular, the
firmware LED went on, and the NMEA LED switched from blinking to solid on.
The data included the stuff I
The CP2102 is featured in Chinese ebay 4 buck usb-232 adapters. The chip
suffers from serious bad-driveritis, and I've had to do 'net research to
make it useful with various flavors of Windoze.
Don
Hal Murray
I'm in the habit of using things like:
cat /dev/ttyUSB0
when checking out GPS that
Just checking my build, I got this one:
http://www.mitxpc.com/proddetail.asp?prod=PSDCDCM2ATX-HV
and
http://www.mitxpc.com/proddetail.asp?prod=VOOMPC2BKcat=66
I'm just running mine from either a power supply or AGM, not a vehicle
(at least not at the moment).
Just a FYI, something about
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