Jerry, Chris,
it's all relative, while the Lpro may be a good Rb standard, it's phase
noise is not that good really. You list:
-96dBc/Hz @ 10Hz, -138dBc/Hz @ 100Hz, -152dBc/Hz @ 1KHz offsets
For the Lpro. The new Jackson Labs Technologies LN CSAC GPSDO with SC-cut
phase noise and
Hello,
El 03/06/2012 10:46, saidj...@aol.com escribió:
The FEI-5680A Rubidium that we discussed here some time ago has a much
worse phase noise plot of course, because the 10MHz is generated digitally
through a DDS, not a 10MHz crystal oscillator..
There is a version that generates 10MHz
Said,
Thanks for the info and congrats on the stats from the Jackson Labs stuff.
You mentioned the older HP Z3801. I wonder if you (or others) happen to
have comparison numbers on the Z3816A with the MTI 260 oscillator or the
Z3805 with (I think) the same oscillator. I thought I heard the MTI
On 01/06/12 17:24, paul swed wrote:
David
Thanks
With the changes to wwvb in the states I may need to turn the antennas
towards MSF so my equipment keeps running.
Its funny as I was working on the d-psk-r the rcvrs were locking to MSF.
That was a chuckle to see.
Lets see, a 10 ft loop towards
Hi
Just joined the list - recently acquired a Rapco 1804m, mainly to use as
a frequency standard, especially to have something to check the FE-5680A
that I have.
The unit itself seems to work OK - connected to a cheapie puck style GPS
antenna I got a 2D fix, occasionally 3D which
On 28/05/12 19:48, Hal Murray wrote:
ei6iz.bren...@gmail.com said:
Anyone tinkered with measuring GPSd, NTPd and network delay tomography?
No, but as the network admin for a reasonably large network, much of it
wireless I'd like to explore this
If you turn on rawstats in ntp.conf, it
On 27/04/12 05:12, Larry McDavid wrote:
I unexpectedly came into a small supply of the 3-pin Universal
Mate-N-Lock connectors that plug into the power connector on the rear
panel of the HP Z3801A GPSDO. If you need one of these and can't readily
find it locally, contact me off-list.
I really
On 03/06/12 12:34, Magnus Danielson wrote:
On 28/05/12 19:48, Hal Murray wrote:
ei6iz.bren...@gmail.com said:
Anyone tinkered with measuring GPSd, NTPd and network delay tomography?
No, but as the network admin for a reasonably large network, much of it
wireless I'd like to explore this
Sounds like a better antenna and location might be the trick. You don't say
how high what coax length and type...
Since you do not have a manual you sat mask angles may also be causing an
issue by eliminating possible sats.
But weak signals will do exactly what you see 2 d fixes and an occasional
I do
On Sun, Jun 3, 2012 at 5:48 AM, Magnus Danielson mag...@rubidium.dyndns.org
wrote:
On 01/06/12 17:24, paul swed wrote:
David
Thanks
With the changes to wwvb in the states I may need to turn the antennas
towards MSF so my equipment keeps running.
Its funny as I was working on the
Hi
If you are trying to do microwave work, phase noise is going to be an issue no
matter how you do it. A lot of the design effort always goes into a low noise
oscillator chain in that sort of gear. For HF gear, phase noise may not be
quite as big an issue. A lot of rigs pretty much ignore
Is there any indication the carriers of WWVB and MSF are locked together?
-John
=
I do
On Sun, Jun 3, 2012 at 5:48 AM, Magnus Danielson
mag...@rubidium.dyndns.org
wrote:
On 01/06/12 17:24, paul swed wrote:
David
Thanks
With the changes to wwvb in the states I may
On 03/06/2012 16:59, paul swed wrote:
Sounds like a better antenna and location might be the trick. You don't say
how high what coax length and type...
Since you do not have a manual you sat mask angles may also be causing an
issue by eliminating possible sats.
But weak signals will do exactly
But I was really hoping to cadge a copy of the manual.
Sent offline.
David GM8ARV
--
SatSignal software - quality software written to your requirements
Web: http://www.satsignal.eu
Email: david-tay...@blueyonder.co.uk
___
time-nuts mailing list
03/06/2012 19:09
Thanks for the great replies! My immediate need is to check some used
test equipment I have bought, a Racal dana 9908 counter and a Marconi
2019A signal generator. They don't agree with one another! I was going
to get a Thunderbolt unit and PS, but my friend mentioning noise
Not obvious from here at least. Though they could be closely matched and
propagations playing games.
On Sun, Jun 3, 2012 at 12:20 PM, J. Forster j...@quikus.com wrote:
Is there any indication the carriers of WWVB and MSF are locked together?
-John
=
I do
On Sun, Jun
Sent from my iPod
On 2012-06-03, at 2:19 PM, Chris Wilson ch...@chriswilson.tv wrote:
03/06/2012 19:09
Thanks for the great replies! My immediate need is to check some used
test equipment I have bought, a Racal dana 9908 counter and a Marconi
2019A signal generator. They don't
hello Rex,
from what I have seen the lowest noise is available on the Z3801 with 10811. I
also have a Z3815 with E1938A oscillator, but the 3801 is much less noisy and
more stable. Don't have a 3816 or 3805 to test against.
Keep in mind that there is a large performance variation from unit to
Hello Javier,
I have a couple from that last Ebay lot , and the phase noise/spurs are so bad
on these that I figured the 10MHz must have been generated by a DDS. I posted
the phase noise and ADEV plots of this unit to this list earlier this year.
bye,
Said
Sent From iPhone
On Jun 3, 2012, at
Sorry for the waste of bandwidth with my prior blank email.
Mea Culpa.
Chris, I went thru this process several years ago and ended up purchasing the
G3RUH GPSDO. For amateur radio usage (vs time nuts usage) it seemed like a
good choice to me. I also liked not having to roll the dice on an
Hi, Said,
I think that all of the last cheap ebay lot are of the second variety
(60MHz osc + 5.3125MHz DDS, very narrow tuning range through serial port
message). I remember your phase noise and adev plots on them. But I
don't know if the first variety (the ones with a 55MHz or so crystal
Hello Chris,
You are on the right track.
I have had the Trimble Thunderbolts (3 each) for about 5 years now.
Just to be sure everything compares favorably
I use Lady Heather PC software to monitor their performance (de KE5FX
website)
Stay tuned to this reflector, lotsa interesting
On Sun, Jun 3, 2012 at 11:19 AM, Chris Wilson ch...@chriswilson.tv wrote:
03/06/2012 19:09
...My immediate need is to check some used
test equipment I have bought, a Racal dana 9908 counter and a Marconi
2019A signal generator. They don't agree with one another! I was going
to get a
I have several of these, all work well, all take some time to settle down
after the control LED comes up. I can't remember now if any of mine have shown
fine either but have compared all with a trio of Thundebolts and all work well
as I say.
There's a manual for the Rb version available from
On 03/06/12 21:41, gandal...@aol.com wrote:
I have several of these, all work well, all take some time to settle down
after the control LED comes up. I can't remember now if any of mine have shown
fine either but have compared all with a trio of Thundebolts and all work well
as I say.
Hi
For your immediate need, a Thunderbolt sounds like the ideal solution. It will
give you a very accurate reference to sort out your test gear and likely good
enough phase noise for most of the rest of what you want to do. Once you get
into the microwave stuff, plan your PLL's properly and
Hi
For your immediate need, a Thunderbolt sounds like the ideal
solution. It will give you a very accurate reference to sort out
your test gear and likely good enough phase noise for most of the
rest of what you want to do. Once you get into the microwave stuff,
plan your PLL's properly
Hi
As long as it shows rev E or rev D it's likely a later version unit. The
date code on the OCXO is the best indicator, but even that's not 100%. As long
as it's one made after about 2002 you will have a good one.
Bob
On Jun 3, 2012, at 5:58 PM, Chris Wilson wrote:
Hi
For your
Hi
I think that if you switch to an averaging of a few seconds from per pixel
the plot of frequency difference will look a bit different. The phase
perturbations from DDS will still be there, and they are an issue. They just
many not be as dramatic as that plot implies.
Bob
On Jun 3, 2012,
I would not use a Thunderbolt. It dithers the OCXO frequency to correct
the second pulse and that frequency change will be multiplied particularly in
U wave applications.. I have never checked, but if LH has a hold function
you could use it, but in that case I would also bring out the
On Sun, Jun 03, 2012 at 09:20:59AM -0700, J. Forster wrote:
Is there any indication the carriers of WWVB and MSF are locked together?
-John
=
Given it's only 60 KHz and certainly somewhere north of parts in
10^13 and probably down to 10^14 or 10^15 the distinction
LF diurnal variations are considerable, in the many microseconds
range. Thus any claim of parts in 10^13 or 10^14 or 10^15 accuracy
is misleading.
Even one microsecond of atmospheric phase change over an hour
is equivalent to a 2.7e-10 apparent frequency offset. Cal labs that
still use LF signals
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