Hi,
have a look at trhis side...
http://www.g4jnt.com/EvenSimplerSimplestGpsdoPossible.htm
Rgds Ernie
-Original Message-
From: Magnus Danielson
To: time-nuts
Sent: Sat, Mar 10, 2012 5:19 pm
Subject: Re: [time-nuts] DIY GPS-DO
On 03/10/2012 04:11 PM, Azelio Boriani wrote:
That is interesting as that was my primary chain. Though I used the
secondary close by.
Oh well seems they are trying them out.
Also emailed ursanav. They have a bogus email. How is that for customer
contact.
Regards
Paul.
On Sat, Mar 10, 2012 at 9:31 PM, wrote:
> NJ would have been covered by t
NJ would have been covered by the Northeast US chain, GRI 9960.
The stations were:
Master Seneca NY
Whiskey Caribou ME
XrayNantucket (Siasconset) MA
Yankee Carolina Beach NC
ZuluDana IN
--Glen
Quoting paul swed :
Thanks Greg. Right you are. But what would NJ be then?
On Sat, Mar 1
I've done this as well.
I daisy chained several pieces of hp and marconi gear together that all had an
approx 1k ohm input impedance for the frequency reference and fed them from a
single 10 Mhz source via t connectors with a 50 ohm terminator at the end of
the line. Looking at the signal wit
You may want to take a look at the signal on a scope. Most instruments
terminate their reference input. You might actually have 4 50 ohm loads
on the Thunderbolt's output and the input voltage might be marginal. If
your instruments have both reference input and output, it's better to
daisy c
On 3/10/12 2:42 PM, Azelio Boriani wrote:
Amazing, 10 at -19... will it ever be measurable?
build three and compare them?
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Hi
Measuring it will be a lot cheaper than building a pair of them to feed the
comparison...
Bob
On Mar 10, 2012, at 5:42 PM, Azelio Boriani wrote:
> Amazing, 10 at -19... will it ever be measurable?
>
> On Sat, Mar 10, 2012 at 10:02 PM, Attila Kinali wrote:
>
>> On Fri, 9 Mar 2012 15:29
A month or two ago I had sketched out a simple distribution amp
for my 10 MHz reference. In the meantime I became somewhat
disillusioned about my FE-5680a standards. So I removed the
FE-5680a and disconnected its power supply from the box that
holds the Thunderbolt, power supply, and big line
Amazing, 10 at -19... will it ever be measurable?
On Sat, Mar 10, 2012 at 10:02 PM, Attila Kinali wrote:
> On Fri, 9 Mar 2012 15:29:39 +0800
> Roger Costello wrote:
>
> > I noticed this which could potentially be a very good thing.
> >
> >
> https://newsroom.unsw.edu.au/news/science/nuclear-clo
Hi,
On 03/10/2012 10:37 PM, John Allen wrote:
Hi Magnus et al - You startled me with "Garners PLL book"! I knew what you
meant but also that the name was not quite correct and I was racking my brain.
It is Floyd Gardner's Phaselock Techniques, a classic. The Third edition was
recently release
Thanks Greg. Right you are. But what would NJ be then?
On Sat, Mar 10, 2012 at 3:27 PM, Greg Broburg wrote:
> Great Lakes Chain was 8970 not 8790
>
> Greg
>
>
> On 3/10/2012 1:55 PM, paul swed wrote:
>
>> While on a business trip I had seen the discussion on LORAN C and that it
>> was out of a t
Charles P. Steinmetz wrote:
Bill wrote:
At what frequency do you have 1 nv per square root Hz with opamp and
what opamp ?
With most op-amps suitable for a 10 MHz distribution amp, the input
voltage noise is specified at 100 kHz or greater. For example, the
OPA653 that Bruce tested is speci
Hi Magnus et al - You startled me with "Garners PLL book"! I knew what you
meant but also that the name was not quite correct and I was racking my brain.
It is Floyd Gardner's Phaselock Techniques, a classic. The Third edition was
recently released.
http://www.amazon.com/Phaselock-Techniques-F
For a new piece of equipment with a warranty the base price doesn't seem hugely
excessive.That being said I'm not in any hurry to buy one to replace my
used hp 5370's.
I agree with the other poster about the excessive prices for used hp5313x
series counters. I can't imagine buying a used
On Fri, 9 Mar 2012 15:29:39 +0800
Roger Costello wrote:
> I noticed this which could potentially be a very good thing.
>
> https://newsroom.unsw.edu.au/news/science/nuclear-clock-may-keep-time-universe
The paper they refere to can be found at [1] (and other related stuff
can be found on their h
Great Lakes Chain was 8970 not 8790
Greg
On 3/10/2012 1:55 PM, paul swed wrote:
While on a business trip I had seen the discussion on LORAN C and that it
was out of a test site in NJ.
Would that have been the 87900 GRI? Thats what I was picking up and thats
the great lakes chain. Seneca master.
Good point and I agree. Sounds like popping the switches is a bit risky.
Caps a lot easier.
As I say good write up on the technique.
Thanks
On Sat, Mar 10, 2012 at 5:07 AM, wrote:
> Hi Paul
>
> Glad to be of help.
>
> If it's only just started it might be worth just doing the capacitor mod
> for
While on a business trip I had seen the discussion on LORAN C and that it
was out of a test site in NJ.
Would that have been the 87900 GRI? Thats what I was picking up and thats
the great lakes chain. Seneca master.
I am thinking about reaching out to URSANAV to see if there is a need or
interest
Adrian wrote:
> Hello,
>
> just wondering if anyone has tried the new Agilent 53230A counter?
Disclaimer: I work for Agilent and I get a "discount" on the counter :-)
It has a nice user interface (way better than the previous
generation that is now 20 years old) and a handy data logging function
On 03/10/2012 04:11 PM, Azelio Boriani wrote:
Ah, yes, now I see: you suggest to keep track of the FOM and DOP from
message #21 and move the oscillator to minimize them. Interesting and
doable.
The oscillator time and frequency bias is already being supplied, so no
need for a PICTIC to measure
Yes, I was googling around... found also:
www.eas.uccs.edu/wickert/ece5675/lecture_notes/n5675_1.pdf
www.cppsim.com/PLL_Lectures/digital_pll_cicc_tutorial_perrott.pdf
www.analog.com/static/imported-files/tutorials/MT-086.pdf
using --"Phase-Locked Loops" by Best-- as a key.
On Sat, Mar 10, 2012 at
Ciao!
On Sat, 10 Mar 2012 16:11:05 +0100
Azelio Boriani wrote:
> Interesting, as usual, the references by Attila: I'm searching for the book
> by Roland E. Best.
What do you mean by searching? Amazon has it listed and i'm quite sure
you can find it in any better technical bookstore or library.
Ah, yes, now I see: you suggest to keep track of the FOM and DOP from
message #21 and move the oscillator to minimize them. Interesting and
doable.
Interesting, as usual, the references by Attila: I'm searching for the book
by Roland E. Best.
On Sat, Mar 10, 2012 at 3:59 PM, Attila Kinali wrote:
On Mar 10, 2012, at 7:12 AM, Adrian wrote:
> just wondering if anyone has tried the new Agilent 53230A counter?
I like it quite a bit. The YouTube videos by Agilent
do a fair job showing the instrument and are worth a
few minutes if you are interested. Using TimeLab with
John's new TCP/IP suppo
Yes, I totally agree. You can buy an SR620 (25pS single shot) for $1000 and
even less.
On Sat, Mar 10, 2012 at 3:47 PM, J. L. Trantham wrote:
> I just ran a 'Quick Quote' for:
>
> 53230A 350 MHz/12 Digit/20 pSec $3623.00
> Printed English Manual Set
On Sat, 10 Mar 2012 14:07:33 +0100
Filip Ozimek wrote:
> could you recommend me a good project of GPS-DO? I've got a GPS module
> with 1PPS output and a 20 MHz VCXO.
> As I understand to do a phaselock to 1 PPS signal one must build some
> kind of digital PLL. But I'm not sure
> how to calculate
I just ran a 'Quick Quote' for:
53230A 350 MHz/12 Digit/20 pSec $3623.00
Printed English Manual Set 47.55
53230A-010 Ultra High Stability OCXO Time Base 1264.00
53230A-115 Add Channel 3 - 15 GHz
On 03/10/2012 03:05 PM, Azelio Boriani wrote:
Sure it is message ID #21 to be looked for?
If I am to believe the FW manual I referred to, see page 83:
3.3.4 Navigation Data (ECEF Coordinates) ID# 21
Structure: Message ID#: 21
Rate (seconds): 1, 0.2 or 0.5 1
This log contains the receiver’s be
Fantastic, and where can we find a non-overpriced Agilent 53230A?
On Sat, Mar 10, 2012 at 3:12 PM, Adrian wrote:
> Hello,
>
> just wondering if anyone has tried the new Agilent 53230A counter?
>
> 20 ps single shot TI resolution and the graphical display makes it look
> like a much better deal t
Hello,
just wondering if anyone has tried the new Agilent 53230A counter?
20 ps single shot TI resolution and the graphical display makes it look
like a much better deal than the notoriously overpriced 2nd hand HP
53132A that is typically some 15 years old.
Any experience / thoughts?
Adrian
Sure it is message ID #21 to be looked for?
On Sat, Mar 10, 2012 at 2:54 PM, Magnus Danielson <
mag...@rubidium.dyndns.org> wrote:
> On 03/10/2012 02:38 PM, Filip Ozimek wrote:
>
>>
>> It's an old novatel SUPERSTAR II.
>>
>
> It's not hard to hook up a more stable 10 MHz oscillator to the Novatel
If you have a small canned VCXO, thermal performance will not be as good as an
OCXO like the HP10811, so the optimum time constant of the filter will not be
very long, and the analog solution is more practical.
You may want to look at the James Miller design. He uses a Jupiter GPS receiver
whic
On 03/10/2012 02:38 PM, Filip Ozimek wrote:
It's an old novatel SUPERSTAR II.
It's not hard to hook up a more stable 10 MHz oscillator to the Novatel
Superstar II. There is PCB foot-print for it and you need to move a
component (don't recall if it is a resistor or cap) to enable it.
Get th
Yes, the use of the PPS as a disciplining reference was discussed weeks
ago. It was debated whether an analog filtering/interpolation would do or a
digital one is mandatory. The question is, in my opinion, still open and,
in my opinion again, it can be done in the analog domain if a high
precision/
It's an old novatel SUPERSTAR II.
Filip.
Dnia 10 marca 2012 14:14 Bob Camp napisał(a):
> Hi
>
> Which module do you have?
>
> Bob
>
>
>
> On Mar 10, 2012, at 8:07 AM, Filip Ozimek wrote:
>
> > Hello,
> >
> >
> > could you recommend me a good project of GPS-DO? I've got a GPS module w
Hi
Which module do you have?
Bob
On Mar 10, 2012, at 8:07 AM, Filip Ozimek wrote:
> Hello,
>
>
> could you recommend me a good project of GPS-DO? I've got a GPS module with
> 1PPS output and a 20 MHz VCXO.
> As I understand to do a phaselock to 1 PPS signal one must build some kind of
>
Hello,
could you recommend me a good project of GPS-DO? I've got a GPS module with
1PPS output and a 20 MHz VCXO.
As I understand to do a phaselock to 1 PPS signal one must build some kind of
digital PLL. But I'm not sure
how to calculate a correction signal to the VCXO and how to test such a
Hi Paul
Glad to be of help.
If it's only just started it might be worth just doing the capacitor mod
for now and seeing how it goes.
No real reason of course why you shouldn't dive straight in and dismantle
the switches, other than the slight risk of breaking one of the lugs, but
I'd go
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