Hi Ignacio
I have removed a faulty oscillator from one of these, not one of my more
relaxed moments and quite amazed when the board emerged totally undamaged,
but proof at least that it can be done:-)
With the oscillator removed there's access to two sets of connector pads
that will
Hi
If you look at the TDev plots or a phase plot on these units, they look a lot
like a Z3801. They wander 10’s or ns as they do their “thing”. While GPS out of
these receivers is good to (at most) 1 ns. That’s the resolution of the
sawtooth (if they are using it). That only counts if you are
Sorry a few more points to mention.
If for some reason I am particularly concerned about the stability of an OCXO
reference I will compare it to another OCXO and on occasion to a GPSDO as well
while measuring a Device Under Test. This gives me some comfort that if am
looking at the
Folks,
I have noted that a number of Stanford Research TSD12 Rubidium standards are
available on the auction site. I searched the TN archives and the interweb and
came up with little useful information.
Does anyone have any information about these units? Is it a rebadged PRS-10
made for
Hi,
It is possible get any data using fluke 910R?
RM
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Several list members contacted me expressing interest in the
article. None of them were able to download much or anything
from the ARRL QEX web site. That includes me and other ARRL members.
I am working the issue with one call to ARRL so far today. I will
contact Larry Wolfgang at ARRL and see
I am able to download the files associated with the article, but not the
article itself. Guess I need to be a paying member to get the article. The
only files in the download are the XLS file for calculating the filter
values, and the parts list.
It's at http://www.arrl.org/qexfiles in the
Be cautious on these. Take a lesson from my idiocy;
I read this email, said h atomic oscillator, and headed to eBay. Found
a listing for a reasonable price, read through too quickly, and bought
one...
...a non working one meant for parts.
They're interspersed with the working ones and look
Just to add a note on the original question : there are some brand new
never used Vectron 8091s available for a reasonable price now and it's
drift and jitter have been on par with my Wenzel.
I am not yet set up to measure it's phase noise or other general rf
characteristics but according to
It's interesting. I took the hint, and tried sin(a)*sin(b) expand and set
b=a+pi/2. fun fun fun.
All that's needed in theory is a mixer and a pi/2 phase shifter at 5 MHz.
Probably a bunch of other stuff because of real parts :-) Minicircuits will
sell you one, packaged, for about 50 rasbucknicks.
Only a small subset of QEX articles on available in digital format. This
isn't one of them. We'll either need to get a copy from the author, or
from a QEX subscriber.
On 11/12/2014 2:34 PM, Dave M wrote:
I am able to download the files associated with the article, but not
the article itself.
In message 54614a56.4010...@rubidium.dyndns.org, Magnus Danielson writes:
There used to be an academic paper on timing.com's home-page about
their clock-ensemble algorithm called something like Advances in
Time-Scale Algorithms.
PTTI 24, Sam Steins work:
Gentlemen-
I have my paper copy in front of me with the original article.
I am not certain that I can just scan it and send it around due to
ARRL Author copyright matters. But I am willing to scan it.
With all due respect to John, K6IQL the author who spent much time
on his design..I would
Hi
A few more details to add:
The serial com coming out of the GPS has several standard Motorola headers in
it:
@@Eanormal position message
@@EnTRAIM / sawtooth status timing status message
@@Bb Visible satellites message
@@Bo UTC offset message
The first two make sense for a
I believe I have a PDF copy of the article if anyone wants it. It's
about 1.3 MB in size.
DaveD
On 11/12/2014 2:36 PM, Don Latham wrote:
It's interesting. I took the hint, and tried sin(a)*sin(b) expand and set
b=a+pi/2. fun fun fun.
All that's needed in theory is a mixer and a pi/2 phase
List,
There has been limited response from the list for bypass
caps for the HP 3586 and HP 5370. So this is what I was able to come up with:
HP 3586 25ea 470uF 50
Volt Panasonic 667-EEU-FR1H471B for $25 This
includes taxes, shipping to and my postage costs.
HP 5370X 50ea 150uF 50V
Wrote: At some point we will get into hacking the main board
to switch from 15 MHz to 10 MHz.
One doesn’t have to that if one uses the two IC divide by
1.5 circuit I offered the list. I specifically found it so I didn’t have to
hack the innards.
Wrote: The great news is the oscillator is 5
List,
Thanks to all for their comments.
Wrote: The high grade aluminum electrolytics and the
tantalums will look quite different on a network analyzer as you sweep them
from 100 KHz up.
OK. Since these of just being used for DC PS bypassing on
individual boards I think I’ll be OK with the
John wrote:
It is a cute technique, not originated by me, but useful.
Indeed it is. I designed a similar one using a quadrature hybrid
splitter and level 7 mixer, and it's almost scary how well it
works. It's as cute as a regenerative divide by two using a DBM.
Best regards,
Charles
I also appreciate the Wenzel circuit. Not seeing the other article, I might
guess that maybe it offers suppression of the original 5 MHz signal as a
benefit.
It seems to be the equivalent of a digital XOR circuit with one lead
delayed by 90 degrees.
Regards
Paul
WB8TSL
On Wed, Nov 12, 2014 at
Hi
The chain in the Z3810 / 3811 / 3812 Lucent boxes is *much* different than the
setup in the earlier parts. The phase noise and ADEV on the Z3810’s is better
than what you got on the earlier versions. That makes keeping the noise down in
whatever mod you do more important. The existing 10
As a subscriber to QEX I saw this article but thought that the bi-phase
rectifier was a lot easier and has be well characterised by the
time-nuts experts. Now it has shown up here I would be interested to hear
from those experimenting how badly the NE602 performs compared with a
passive DBM
Just a few days ago, I ordered parts to build a couple of the Wenzel 2-diode
doublers, described in the same article as your full-wave diode doubler,
just in time to discover them on Ebay (via slow boat from China), item#
171511157159. I inspected the components and layout in the picture in
Charles,
Thank you, I found this very enlightening. Now I have to find the 9.7
KHz pulses, no luck so far.
Best regards,
Ignacio
El 12/11/2014 a las 7:34, Charles Steinmetz escribió:
Ignacio wrote:
I'm not very sure that the DAC is working, I suppose that the unit
doesn't measure the
I'm a member, and the article is not there -- just the Excel spreadsheet
and a Word document of the parts list.
Too bad, I have a handful of 5 MHzx TCXOs.
I may have hardcopy of the issue, will have to dig for it.
Jim
wb4...@amsat.org
On 11/12/2014 3:34 PM, Dave M wrote:
I am able to download
Hi Nigel,
Thank you for the suggestions, I was trying to avoid the OCXO removal
but I think that now it must be done.
I was also playing with the idea of populating the connectors so an OCXO
exchange could be easily made, this makes possible to try various
oscillators.
Meanwhile I has been
Looked it up and pretty amazing. Can't really say how well the ferrite will
go down to 5. It should.
Paul
WB8TSL
On Wed, Nov 12, 2014 at 7:22 PM, Dave M dgmin...@mediacombb.net wrote:
Just a few days ago, I ordered parts to build a couple of the Wenzel
2-diode doublers, described in the same
Hi
The Wenzel doubler has a bit of “stuff” in the middle of the bridge. It’s tuned
a bit to give it best performance at a specific frequency. It’s not narrowband,
but it is not a 2:1 bandwidth.
Bob
On Nov 12, 2014, at 7:22 PM, Dave M dgmin...@mediacombb.net wrote:
Just a few days ago, I
I'm dusting off one of my GPSDO here, and find that I do not have the manual or
the software for this Efratom/Datum Starloc II. With the
Datum/Efratom/Symmetricom/Microsemi transitions (I may have missed one or
two...) I don't know if any info is even still available from Microsemi.
Little is
Hi
It seems reasonable that there is a 1 pps somewhere on the board. The big
question is if it’s the output of the GPS receiver or the output of the OCXO
after division.
Bob
On Nov 12, 2014, at 8:10 PM, EB4APL eb4...@cembreros.jazztel.es wrote:
Hi Nigel,
Thank you for the suggestions,
Hi
In the “as wired” configuration, that looks more like a full wave doubler than
the full Wenzel tuned multiplier. You may be able to re-wire it for the full
circuit.
Bob
On Nov 12, 2014, at 8:20 PM, paul swed paulsw...@gmail.com wrote:
Looked it up and pretty amazing. Can't really say
I mentioned my article because it is a useful technique. The major virtues are
that it is analog, thus possibly a lot less noise than an XOR, it is easy, and
the
fundamental and all of the odd harmonics are well suppressed.
I make no claim that it is better or cheaper, or is a prettier color
Hi
On Nov 12, 2014, at 5:24 PM, Poul-Henning Kamp p...@phk.freebsd.dk wrote:
In message 54614a56.4010...@rubidium.dyndns.org, Magnus Danielson writes:
There used to be an academic paper on timing.com's home-page about
their clock-ensemble algorithm called something like Advances
Brian wrote:
Personally, I'm lazy and like the Wenzel full wave rectifier
design with a nice BPF on the output to obtain a clean 10MHz.
The advantage of the multiplier circuit is that the signal straight
out of the mixer has excellent harmonic and 5MHz suppression. In my
circuit with the
I digitized the first 2011 article to hand, the one in Jan-Feb; it's a smaller
article, and not as elegant as the later one. Anyone interested can email me
off-list. You're allowed to have a copy for your own use, just can't
re-publish.
Don
Jim Sanford
I'm a member, and the article is not there
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