On 06/28/2010 01:46 AM, Stanley Reynolds wrote:
done
www.n4iqt.com/picticii/circuit.jpg
www.n4iqt.com/picticii/PICTICII.bmp
both above as pdf
www.n4iqt.com/picticii/circuit-pcb.pdf
Looks like page 2 of the schematic isn't there. The analog interpolator
is there... if the overall schematic
As a first post I thought I'd share a success story.
After a lot of flailing about the magic combination to upgrade a TS-2100
from old/ROM firmware appears to be to ensure the line endings on the
file match that of the TFTP host. While it is twitchy about ethernet as
long as there's no contention
HI Julien,
Do you have a detailed info, docu about the TrueTime XL-DC??
I have 2ea of this unit and one is not going to lock...
Any experience or help appreciated.
Rgds Ernie.
-Original Message-
From: Julien Goodwin time-n...@studio442.com.au
To: time-nuts@febo.com
erniepe...@aol.com wrote:
HI Julien,
Do you have a detailed info, docu about the TrueTime XL-DC??
I have 2ea of this unit and one is not going to lock...
Any experience or help appreciated.
Rgds Ernie.
There's a fair amount of info on the XL-DC on the web. I assume your
problem is
Greg,
There is an iPhone/iPad app called Atomic Clock from Gorgy Timing. It syncs
with time servers on the net and, within the limits of my visual cortex,
appears
to keep the same time as my GSPDO referenced clock.
Mark
Message: 1
Date: Sun, 27 Jun 2010 18:52:13 -0600
From: Greg Anderson
Sorry, my mistake, updated the pdf.
Stanley
- Original Message
From: Magnus Danielson mag...@rubidium.dyndns.org
To: time-nuts@febo.com
Sent: Mon, June 28, 2010 2:57:34 AM
Subject: Re: [time-nuts] PICTIC II
On 06/28/2010 01:46 AM, Stanley Reynolds wrote:
done
I'm quite sure someone has went down this road...
so I better ask first.
Phase noise wise what would be the best OCXO's that
we could find around, taken from equipments, or ebay
etc.
I have in mind essentially the HP ones. the PIEZZO
ISOTEMP, CMAK, Vecton(harder to find) and some of the small
Hi,
Ok, I have the info from the web but it is not too much.
I got GPS data but seems to me that the ECF is out of limit? and the
digital word is not changing...frozen but sometime very seldom it is locked
properly after tickling a few hrs.then no luck for the next few
Wenzel ULN-grade parts and Valpey-Fisher's VFOV110 line come to mind.
There's also a vendor in the UK whose name escapes me who has been
advertising ULN-class OCXOs lately (I think someone from there is actually
on the list.)
The term ultra low noise is common in the XO business, but only a few
And the price will make your eyes water!!
Dave P.
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of John Miles
Sent: 28 June 2010 15:33
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Best OCXOs,
Hello to the group. This is slightly off subject.
But from what I have seen there is a vast wealth of experience and knowledge
in this group.
I have picked up a RohdeSchwarz SMIQ03b 300khz-3.3Ghz sig gen.
Have already repaired several issues with the cpu battery backup etc.
But the summing board
Check the on-board battery. It may not be up to spec.
Good luck on changing it ... True-Time could not have
made it more difficult.
73, Dick, W1KSZ
-Original Message-
From: erniepe...@aol.com
Sent: Jun 28, 2010 4:43 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] Datum TS-2100
Hi Dick,
I chked already and found satis.but what current load shall I chk and what
is the nominal voltage??
Rgds Ernie.
-Original Message-
From: Richard W. Solomon w1...@earthlink.net
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Mon,
I do not think I can answer that question the way you present it. It
depends to a large degree on what you want to use it for. If you want to
multiply to microwave frequency there are 100 MHz units out there with
excellent
low phase noise in the $ 400 to $1400 price range, if it is Allan
Hi
Output frequency matters quite a bit. What is good phase noise at 100 MHz
isn't going to be very impressive at 10 MHz. Frequency offset also matters.
Optimizing for -192 dbc / Hz at 100 KHz offset is a very different thing than
trying for -155 dbc / Hz at 10 Hz offset. You are unlikely to
Hi
TI has a line of ADC's that drop a chopper stabilization loop around a fairly
normal 24 bit audio ADC part. Their claimed benefit is that they take down
the level of flicker noise and DC drift present in audio only parts.
Since most of the interesting stuff on an EFC is long time span,
High Stanley,
On 06/28/2010 03:29 PM, Stanley Reynolds wrote:
Sorry, my mistake, updated the pdf.
Many thanks. :)
Looks like an interesting project. Should fit many needs.
Cheers,
Magnus
___
time-nuts mailing list -- time-nuts@febo.com
To
Bob,
Do you have a part number to suggest a quick glance a the TI web site did not
show up any parts in that category...
I found a Cirrus Logic ADC with chopper front end and good low noise specs,
CS5530.
It's a 24 bit ADC but the ENB (noise free) drops to 15 at 1ksample/sec. Even at
the
On 06/27/2010 08:38 AM, Hal Murray wrote:
jim...@earthlink.net said:
So, over the, say, 100 Hz and up range, they're probably pretty good.
I like to think I'm pretty good at reading data sheets, but when it comes to
modern A/D chips, I'm not so sure.
20 years ago, the specs were for DC and
Hi
The one I'm building up is a ADS1278
http://focus.ti.com/lit/ds/symlink/ads1278.pdf
There are others in the series with fewer inputs. As with a lot of converters,
there isn't a whole lot of data on them.
Bob
On Jun 28, 2010, at 2:49 PM, Didier Juges wrote:
Bob,
Do you have a part
On 06/27/2010 12:31 AM, Stanley Reynolds wrote:
I have a FEI Communications FE-405B DOCXO looking for info.
Sales flyer and pictures of the unit here: www.n4iqt.com/fei-fe405b
The Sales flyer listed the 405A and I have the 405B don't know the difference.
A manual that shows the digital error
Hello, Time Nutters--
Traceable to NIST...? All you need is this LPRO Rb osc being
disciplined by a GPSDO and you can claim NIST traceability?
Not the way I understand the rules
http://www.tenmhz.com/GPSDO.htm
What say the list?
Mike Baker
--
Today’s communication
Time-Nuts,
The PICTIC WIKI page has been updated to include a PDF of the
schematic and board layout as requested.
Richard
On 06/28/2010 01:46 AM, Stanley Reynolds wrote:
done
www.n4iqt.com/picticii/circuit.jpg
www.n4iqt.com/picticii/PICTICII.bmp
both above as pdf
According to these web sites, the GPSDO provides traceability to NIST:
http://www.nist.gov/physlab/div847/grp40/gpsarchive.cfm
http://tf.nist.gov/general/pdf/1305.pdf
As a sanity check, it would be prudent to periodically cross-check your
GPSDO against a different frequency standard (e.g.,
Thanks, looking into it now, maybe they left the door unlocked.
Stanley
- Original Message
From: Magnus Danielson mag...@rubidium.dyndns.org
To: time-nuts@febo.com
Sent: Mon, June 28, 2010 3:33:12 PM
Subject: Re: [time-nuts] FE-405 DOCXO info request
On 06/27/2010 12:31 AM, Stanley
Here's a newer article by Michael Lombardi:
http://tf.nist.gov/general/pdf/2297.pdf
Note that a measurement uncertainty analysis is a required component of
traceability. Therefore for the GPSDO to be traceable to NIST, someone
(either the manufacturer or the user), must perform an uncertainty
On 06/28/2010 11:25 PM, Stanley Reynolds wrote:
Thanks, looking into it now, maybe they left the door unlocked.
You will not know until you try the handle.
You would need to take a photo of the other side of the PCB. I tried to
find it among your photos, but no luck. I would have been happy
Hi
A lot depends on just how much smarts is behind the little green light.
There's not a lot of information about what they are (or aren't) checking
before the light goes green.
One possibility:
Check that you have sats in a good constellation for 24 hours (= check
antenna location)
Check
On 06/28/2010 11:36 PM, Greg Burnett wrote:
Here's a newer article by Michael Lombardi:
http://tf.nist.gov/general/pdf/2297.pdf
Note that a measurement uncertainty analysis is a required component of
traceability. Therefore for the GPSDO to be traceable to NIST, someone
(either the manufacturer
I have not looked at that side of the PCB yet, the plate it is on looks too
thick to be just support, maybe a heat sink / heat spreader. It has the name
Double Oven CXO and I can see the Crystal oven not sure how the second oven
works but think that plate may not come off easy. To be honest I
Hi Mike,
The concept of traceable to NIST merely means you have a reference PATH back
to
NIST. The level of accuracy to which you claim would still need to be
characterized and specified should you publish any claims as to having
calibrated
some piece of equipment.
The purpose of claiming
The one I'm building up is a ADS1278
http://focus.ti.com/lit/ds/symlink/ads1278.pdf
There are others in the series with fewer inputs. As with a lot of
converters, there isn't a whole lot of data on them.
What are you looking for?
There is a section of DC parameters on page 3.
No missing
Hi
Noise spectra down into the 1/f region ( 10 Hz) would be nice.
Bob
On Jun 28, 2010, at 7:45 PM, Hal Murray wrote:
The one I'm building up is a ADS1278
http://focus.ti.com/lit/ds/symlink/ads1278.pdf
There are others in the series with fewer inputs. As with a lot of
converters, there
On 06/29/2010 01:45 AM, Hal Murray wrote:
The one I'm building up is a ADS1278
http://focus.ti.com/lit/ds/symlink/ads1278.pdf
There are others in the series with fewer inputs. As with a lot of
converters, there isn't a whole lot of data on them.
What are you looking for?
There is a section
Noise spectra down into the 1/f region ( 10 Hz) would be nice.
Usually that stuff scales with the master clock frequency.
There are a couple of shorted-input graphs on page 11. They go down to 1 Hz.
Figure 15 on the next page goes down to 0.2 Hz.
For EFC type uses, I'd expect the drift
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