On Sun, 30 Jan 2011 23:47:10 +0100
Magnus Danielson wrote:
> On 30/01/11 23:08, ehydra wrote:
> > I'm not sure if I overview the problem correctly. Hm, why not run
> > the cable back and measure the round time? Half this time und you
> > know the delay of one way. Then you can shift this with a P
> > Hopefully you mean this along the lines of: should you decide to feed two
> > different clocks into the Virtex-2, and use the dedicated global clocks,
then
> > you guess the isolation between those 2 global clock lines to be on the
order
> > of about 20-30 dB. So basically...
> No guessing..
> Perhaps a bit late, but have you considered the ICS670?
> http://www.idt.com/products/getDoc.cfm?docID=18461996
I just checked the datasheet. Wouldn't you say that it would result in more
noise when compared to a CVHD-950/ADF4002 combo?
regards,
Fred
_
On 2/6/2011 9:57 AM, Murray Greenman wrote:
there should not be a 5V
input required on the 5680A.
There are MANY versions of 5680A. Some definitely do need 5 V input to
work. From this thread, apparently on the ones that do need 5 V input,
different versions even use different pins for this v
Perhaps a bit late, but have you considered the ICS670?
http://www.idt.com/products/getDoc.cfm?docID=18461996
--
Geraldo Lino de Campos
gera...@decampos.net
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Boy I highly recommend Dave and Artek Media.
Couple comments
Very fast to turn a link around so you can download the manual
Many of the manuals you may get for free from agilent and other places. But,
when you magnify those schematics they typically fall apart. I don't know
why but its always the r
something from say EE level to Time-nuts ?
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i'll more the 2nd that, Dave is amazing and considering the time it
takes to scan, specially the long fold outs what he charges is very
reasonable. Plus is you have a manual he is looking to scan, you send
it to him he scans it, sends it back with a CD/DVD of your manual and
a free one of your choi
David, your email isn't going in my spam bin and I'm not ignoring you. You
sent me an email before I was awake and didn't wait for a reply. I waited
patiently for the better part of a year for you to solve issues sourcing
parts and getting boards done. How about giving me a couple of hours to hi
Bud,
I have a couple of these units going nicely, but I agree with Bob, you
are best to sort the pinouts for yourself since they vary.
Take the lid off (it's fairly simple, screws on the base, on the side
and by the connector) and identify the 5V regulator input, then use an
Ohmmeter to find where
Artek is a very reliable and helpful outfit.
-John
==
> Date: Sat, 5 Feb 2011 19:14:07 -0600
> From: "Dave M"
> Subject: Re: [time-nuts] HP 654A Manual
> To:
> Message-ID:
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
>> From: Gord
On 2/6/11 12:37 AM, cook michael wrote:
I had a quick look at the IEEE-1355 HIC bus on which spacewire is based
and it seems that although the clock is not on the wire, it can be
reconstructed as an XOR of the strobe and data. So a passthrough
connector sampling those lines (differential) with RS
On 2/5/11 10:20 PM, Tijd Dingen wrote:
You don't feed the ADC from the FPGA if you can avoid it.
especially if your ADC clock is a different frequency from the processor
clock that's being used for most of the other logic on the FPGA. I'd
give a ballpark estimate of 20-30 dB isolation between
Date: Sat, 5 Feb 2011 19:14:07 -0600
From: "Dave M"
Subject: Re: [time-nuts] HP 654A Manual
To:
Message-ID:
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
> From: Gordon Batey
> Subject: [time-nuts] HP 654A Manual
> Greetings TimeNuts
>
> Does anyon
On 2/5/11 10:14 PM, Hal Murray wrote:
I've got a system at work with an internal clock oscillator that I want to
get some statistics on, but there's no direct visibility for the
oscillator, nor do I have a convenient test point that I can probe.
...
Fun problem. Thanks for tossing it out.
damn send button
Additionally, the definition as used in this appnote from Vectron:
http://www.vectron.com/products/literature_library/absolute_pull_range.pdf
Definition
APR is the minimum guaranteed amount the VCXO can be varied, about the center
frequency (fo). It
accounts for degradat
Additionally, the definition as used in this appnote from Vectron:
http://www.vectron.com/products/literature_library/absolute_pull_range.pdf
- Original Message
From: Tijd Dingen
To: Discussion of precise time and frequency measurement
Sent: Sun, February 6, 2011 4:47:20 PM
Subject:
> > Possibly you mean the CVS575 datasheet does not have any aging specs The
> > datasheet for the CVHD-950 specifies aging as "<3ppm 1st/yr, <1ppm
> > thereafter" which is good enough for me. So it's now on the shopping list.
> No, what I meant was that the data sheets didn't have any t
Please could Hadley Allhands, and Robert Darlington please check their mail
(including spam folders) for mail from paypal.co.uk and from me.
Regards,
David Partridge
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On 06/02/11 07:14, Hal Murray wrote:
I've got a system at work with an internal clock oscillator that I want to
get some statistics on, but there's no direct visibility for the
oscillator, nor do I have a convenient test point that I can probe.
...
Fun problem. Thanks for tossing it out.
On 05/02/11 19:43, x...@darksmile.net wrote:
I wonder if there is any value to performing a FFT on the data.
Not really. The added noise is clearly visible in the time domain and
does not form a very meaningful view in the frequency domain. With a
suitable pre-processing a histogram tells muc
I had a quick look at the IEEE-1355 HIC bus on which spacewire is based
and it seems that although the clock is not on the wire, it can be
reconstructed as an XOR of the strobe and data. So a passthrough
connector sampling those lines (differential) with RS-644 receivers and
a quad NAND may be
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