> -Original Message-
> From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of KA2WEU--
> - via time-nuts
> Sent: Saturday, July 18, 2015 3:40 PM
> To: time-nuts@febo.com
> Cc: akpod...@synergymwave.com; alexander.r...@rohde-schwarz.com
> Subject: Re: [time-nuts] how to find low n
> The BFG540 is amongst the best Oscillators oscillators
>
> http://www.nxp.com/documents/data_sheet/BFG540_X_XR_N.pdf
>
> Now you outperform most colleagues
>
> 73 de Ulrich N1UL
Last time buy 31-Dec-15. :( Have you heard of any good substitutes?
I've built a lot of amps with BFG591s, a
> Few people need the CS on all the time. The other funny thing on the HP
> series you can turn the tube off and just use the OCXO after its been
> adjusted accurately.
> I run my HP 5065a Rb the same way. Power as needed and every 6 months.
> So you are very lucky to have a good CS.
Rbs are a bi
> Chapter 3 might be of interest. It has rules on RF amplifiers, arbitrary
> waveform generator, signal analyzers, etc. I've never looked for
> counters or TICs.
It's been a couple of years since I had to look into this stuff myself, but
from what I've seen, frequency/TI counters aren't covered
Yep, it will ignore any non-numeric data like "us" suffixes. It will always
interpret incoming data as seconds, so the 1E-6 scale factor is appropriate if
the counter is returning microseconds. I'll tweak the mouseover help text for
the scale factor field to clarify that.
I think you're bas
Let's see a snapshot of your acquisition dialog, just before you hit 'Start'.
(Or send me a .tim file directly.) It can be tricky to configure the test
setup for a TI measurement, since so many more things can go wrong compared to
a frequency-based setup.
-- john, KE5FX
Miles Design LLC
> --
> When you go very close in on something like a VCO, you get much higher phase
> noise
> than we normally worry about. Some of the “assumptions” that underly the
> measurements
> are no longer true. Small angle of modulation is one, but there are a few
> others.
That's a good point as well. L(f)
PM
> To: time-nuts@febo.com
> Cc: mag...@rubidium.se
> Subject: Re: [time-nuts] Close in phase noise of microwave VCOs
>
> Jim,
>
> John Miles have been a bit active:
> http://www.ke5fx.com/brick/brick.htm
>
> Just to give you a start-sample.
>
> Cheers,
>
> The overall result is a bit disappointing, given what I set out to
> accomplish. I can now compare the results from PN3048 in baseband noise
> mode to get absolute measurements, which will be useful. The DOS code
> produces calibration and result files which are unreadable to the RMB
> version an
> I'm searching for the less expensive signal analyzer to perform phase noise
> measurements on OCXO's. There is no need to go above 400 MHz - 1 GHz. I'm
> particularly interested on low frequency offset and good close in phase noise
> specs. Any recommendations?
Tough to say without a budget rang
> Squaring up a 10811 with a comparator is a perfect example of this
> principle. Non-time-nuts always seem to gravitate to this design.
>
> Of course you're right, any comparator will add jitter to a 10811.
> The faster they are, the more jitter they add.
A comparator with less open-loop gain w
>The faster the comparator, the greater its analog bandwidth.
>Thus there is more total noise to cause jitter. The DC to
>daylight comparator is the opposite of the John Dick (JPL)
>paper on zero crossing detectors in PTTI around 1990. John
>teaches that you use the MINIMUM bandwidth amplifier t
> -Original Message-
> From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob
> Stewart
> Sent: Sunday, March 22, 2015 7:03 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Some observations of the BG7T BL GPSDO
>
> Hi John,
> Doesn't
>
> Curious, but I'm wondering whether there are any artefacts that might have
> been caused by the weak GPS signal? I would feel more comfortable if the unit
> had its planned strong GPS signal throughout the test. I know it's meant to
> cope
> with that, but it might have thrown up an obscure s
> Fashinating error. Any details anywhere about how these are built?
>
> A quick search came up with nothing.
Some of them have been sold on eBay (e.g., item 251802969291) and at
http://bg7tbl.taobao.com .
> Is this a FLL design?
>
> There seems to be a somewhat caotic beat pattern in there,
See performance plots, data files, and summary at
http://www.ke5fx.com/gpscomp.htm . Thanks to Bob, W7AVK for the loan of
the unit for testing! Would be curious to know if anyone else has
encountered a similar frequency error, or if the issue I saw was unique to
this particular example.
-- j
> Has anyone measured the AD of a few Morion MV-89?
>
> Wondering how they do from 1 to 100 Seconds.
>
> (With a setup able to reach 5X10-13th at those Tau.)
>
> Thanks,
>
> Corby
>
They vary all over the place. The ones I've bought on eBay range from "pretty
good" to "darned
x27;m
not personally familiar with Microsemi's international distribution but I
imagine it's similar.
(Apologies to the list for posting a direct reply, but my email was bounced by
freemx1.sinamail.sina.com.cn with the error "Too many invalid recipients" when
I tried responding o
> -Original Message-
> From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of joerg
> Sent: Saturday, February 07, 2015 7:14 AM
> To: time-nuts@febo.com
> Subject: Re: [time-nuts] TimeLab with Wine: No RS232 interface available
>
> Thank you all. Unfortunatly I'm still not able
Agreed that simply showing the status of the leap-pending bit is the logical
thing to do, and it's definitely not something I would call a bug. It would be
extremely cool, though, if it used the data from packet 0x58 to display a
countdown timer. I'd volunteer to make the change, but I have an
> However, the 3048A won't achieve lock. The 100 MHz PLL's loop bandwidth
> (about 0.2 Hz) is too slow for the 3048A to achieve lock.
>
> Does anyone have any ideas?
Since the DUT's loop bandwidth is (presumably) below your minimum offset of
interest, I'd try the "Phase noise without PLL" measu
> John,
>
> Your new three-corner hat feature is really cool. Already tried it, even
> if I did not spend quality time on setting source labels correctly.
>
> Whenever I have a setup capable of running it, I will test-spin it again.
>
> I suspect that when you make separate measurements, the noi
>
> Thanks for correcting me there.
> In this case, we have 5kHz / 10 MHz = 0.0005, right?
Yes, that would be it.
-- john, KE5FX
Miles Design LLC
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> One way to get around problems with things like GPSDO’s is to have multiple
> standards and use them for different ranges of Tau. OCXO’s have good ADEV
> close in. Picking up a few and comparing them is pretty cheap. Rb’s have
> better
> ADEV at longer tau (> 300 sec). Comparing three or four is
>
> If you only have your TIM file with you back home, all you have to do is
> to press (e) to Edit the trace, as I recall it. I might have edited the
> file directly also. When doing that, I helped another time-nut at one time.
>
> Uncheck the "Use Input Frequency" and then input 10 MHz (or what
> Just now, I changed the way to calculate frequency and get a better
>ADEV chart.
>http://www.qsl.net/b/bi7lnq/freqcntv4/test/20150114/0114.gif
Looking good! Nice example of a white PM noise floor, just like a 'real' HP
counter. Let it run for a few days and see how the environmental sensitiv
> - Can I use Frequency difference mode from Timelab to monitor time intervals ?
> If no is there a way to use the time interval measurement from the counter
> with
> Timelab to plot ADEV ?
If you feed in frequency samples, it will convert them to phase-difference
samples internally, so the prog
> These would make great units for synthesizer and DDS projects. I don't
> have the ability to measure the phase noise, but should be relatively good
> as they were used at microwave frequencies in their past life.
>
> I'm asking $50 each for them and $7 (any quantity) Priority Mail shipping
> to
> See how Fig 8 and Fig 9 provides two different cross-overs between the
> noise responces, and how the higher bandwidth doesn't have a "hump" just
> because the steered oscillators noise response get's sufficiently
> high-passed by the loop PLL as for the lower PLL it humps up because of
> them ha
NEL has great OCXOs. Also worth checking out Wenzel (they own Croven Crystals
and will sell them separately), Rakon, and Vectron.
I haven't seen any 100 MHz OCXOs rated for -145 at 100 Hz, but -135 can be had.
-- john, KE5FX
Miles Design LLC
> -Original Message-
> From: time-nuts [mai
For the most part, you don't want transformer isolation unless you plan on
using balanced lines. There are worse things than ground loops out there, and
lifting a coax shield away from ground is a great way to find all of them.
You definitely don't want 10.7 MHz IF transformers, unless you are
> Also, I think John's TimePod user manual probably has a description of it.
> Otherwise I remember Sam Stein (who is behind the TSC units) had some PTTI
> or similar presentations discussing the technology, but I don't know where
> those could be downloaded.
I have a large (if debatably organiz
> Hi Said,
> do you have any information about how that "TimePod 5330A works" any
> principal description?
> 73
> KJ6UHN
> Alex
Here's the manual:
http://www.miles.io/TimePod_5330A_user_manual.pdf
These days, it's manufactured and sold by Microsemi as the 3120A Phase Noise
Test Probe. Microsem
> Morning nuts-
>
> I'm aware several of you use the ADF4002 for a simple small PLL in your
> radios. Could any of you share some example bits or maybe even the code
> you use during startup? I know what my latch values should be, but I
> don't seem to be getting them wrapped in the right contr
> > If you get the tube working, you should use a counter or Lissajous display
> > with a GPS or rubidium standard to preset it to the correct resonance peak
> > frequency for lockup. The tube will probably be pretty noisy at first. If
> > it also has weak beam current, which is common, it will b
There's a good chance you can get it working but not necessarily with the
built-in ion pump supply. In my experience, if it doesn't pump down within a
day or two, it never will. No point waiting multiple days or weeks. The
manual talks about how to connect an external HV power supply, and I w
> The software for these gizmos dates back to Windows for Workgroups 3.11.
> That’s a way back. Even getting it running on Windows 95 was a bit of a
> problem. The biggest issue is that it was hand optimized for some of the
> timeout delays.
>
> If you bring it up, what you want is an old / slow P
> >
> > Yes, but your Q will suffer.
>
> Ok, so it might / might not work depending on how high a Q it needs to start
> functioning. I think I might try it before I went crazy coating he bulb.
> There will
> be a *lot* of weird things to debug and associated tear downs to find them.
> Having a fr
> Mode has been switch from Frequency to TI - result is much better now. It was
> the main improvement in my measurement. Thanks a lot!
> Picture of ADEV OCXO result -
> https://dl.dropboxusercontent.com/u/21338179/hamradio/OCXO_Adev/OCXO%
> 20ADEV%20TI%20mode%2020141102.jpg
If you're taking a res
> >It seems to me that it's just a case of expecting too much from a counter.
>
> Possibly, but a well-tuned 5370B can get to the low e-12's at 1-10
> seconds.
You can get down there with TI averaging, but the data you get is not ideal
since the averaging process smooths out the very instabili
> Assuming that the test above (with the external REF) gives similar
> results to what you posted today, there is something wrong with your
> measurement setup. Are the input signals triggering the counter very
> stably near the middle of their peak-to-peak voltages? Is the
> counter adjusted to
> Charles,
> Thanks a lot for the detailed explanation and recipes. Understood and will
> check this weekend.
> All my Morion 10MHz MV89A OCXOs are used and from eBay's. That's why the
> first version of broken surplus MV89A looks realistic.
> Best regards,
> Karen
Don't forget to hit 'f' and/or '
> I know what your next question will be, "I see that these rubidium
> oscillators all can be adjusted over a range that falls on both sides of
> 10MHz. What should I use as a calibration source to adjust my rubidium
> oscillator?" Then you think "If I have this 10MHz calibration source, why
> n
> Can I have your recommendation regarding a choice of 10 MHz rubidium source
> (available now on eBay like FE-5680; LPRO-101; LPFRS; FRS etc.) as a
> reference signal for my frequency counter Pendulum CNT-91.
>
You might take a look at the plots at http://www.ke5fx.com/rb.htm if you
haven't alr
> Great insight thanks. You nailed it: out with the old oscillator and in with
> one
> that doesn't have that problem.
>
> Btw the mechanical tuning issue you mentioned is essentially the same exact
> problem: even the slightest turn will make the frequency jump too high or too
> low. It can driv
I'm not familiar with the 10811-60212 variant, but I have a -60168 single oven
part whose 6-pin connector is wired like this:
BLK Gnd
RED Oscillator power +11.5-13V
BLK Gnd
YEL Oven monitor
GRN Oven power +20-30V
BLU Oven ground
The coax connectors are probably SMB (J1=EF
> -Original Message-
> From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Camp
>
> For what ever reason, HP sold the 5370 as a “time instrument” and discouraged
> it’s use as a “frequency instrument”. I have absolutely no idea why. That’s
> certainly the way the local sa
> -Original Message-
> From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Tom Van
> Baak
>
> I have several SR620 and HP5370 in my lab. My preference has always been the
> SR620; by size, features, front panel, calibration, programming. But both
> counters do the job so if yo
> Out of curiosity, what's the difference between the two first traces?
> One looks more jump than the other.
These are all factory new OCXOs (in this case, they're TimePod spare parts
undergoing incoming test before I put them on the shelf). The 1303-series
parts both exhibited a small jump a
> -Original Message-
> From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Dr. David
> Kirkby (Kirkby Microwave Ltd)
>...
> If I recall correctly, when I did look some time ago at getting
> another TI counter, the Agilent 53230A seemed to have some
> specifications *worst* th
> -Original Message-
> From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of David
> McGaw
> Sent: Wednesday, September 03, 2014 8:01 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] 10811 Thermal fuse?
>
> Actually, in the unit in which
Looks like a really nice piece of hardware, well worth fixing up. You might
check the hot-wire ionizer filament on the Cs tube for continuity, as a failure
there may not show up in a meter indication.
Apart from that, the detailed troubleshooting steps in the contemporary HP Cs
service manual
> error by pressing "Print Screen" umpteen times until i was quick
> > enough to grab it. the error is repeatable every time and I post a
> > screen shot at htpp://www.gatesgarth.com/heather_error.jpg
>
> > Is there an e-mail address for John Miles I
> > All that said, the real hazard with transformers is that people tend to
use
> > them to drive unbalanced coax cables with balanced signals. This turns
the
> > coax shield into an antenna, at which point you may end up with with
more
> > noise and spurs than you had before.
>
> Could you expla
Are you using the normal marker or the frequency counter marker? The
counter marker should be accurate, while the frequency displayed for the
normal marker position will not be. You may be able to improve the normal
marker's accuracy in narrow spans if you run the shift-W self-calibration
routine
This is indeed terrible to hear. Ulrich's free software contributions were
not only valuable in my work but useful to a lot of other people with test
gear. He was also one of my first customers, putting a lot of faith in a
guy he'd never met who was selling PN analyzers out of his basement in
Sea
>
> I usually don't use drift removal as I want to see the effects of drift!
>
> The effects of oscillators locking together are very apparent on both the
> phase and AD plots when using a DMTD system. There was no indications of
> such locking!
>
> My point was that if you are measuring ultrast
as
well, for the same reason. Ideally the instrument would allow you to choose
the estimator... but look at all of the stuff the user would have to read in
order to understand how to use the feature. :)
-- john
Miles Design LLC
> -Original Message-
> From: time-nuts-boun...@febo.com [
With newer HP/Agilent cards like the 82357A/B, you can enable NI488.2
compatibility in the Agilent I/O Libraries package. Not sure if that can be
done with an 82350B, though... let me know if you try it!
-- john, KE5FX
Miles Design LLC
> -Original Message-
> From: time-nuts-boun...@febo.
Your main concern will be injection locking, followed by the additive noise
of the buffer amps that you use to prevent it. The CMOS output buffers in
the oscillators themselves may provide enough isolation, but don't count on
it. Injection locking is easy to spot with a scope. You can adjust the
This is actually pretty interesting to me. The questions of how to choose
an RTOS and how to handle power management seem to be relevant engineering
topics when discussing the 5370 processor boards. It's not an academic
question in the professional world, where certain instruments I won't name
ar
There were quite a few spurs in those tests due to a wide-open layout with
cables running everywhere. That bump was just a case where the software
didn't get rid of them all.
You can assume they'll be reasonably flat past 1 MHz. That's as far as
those plots went.
-- john, KE5FX
Miles Design LLC
(Different John here) Some quick and dirty residual PN measurements made on
the 100EL family versus some newer clock distribution chips from Analog
Devices:
http://www.ke5fx.com/100EL_vs_AD.png
These may not be directly applicable to 100LVEL parts and shouldn't be taken
as gospel in any case, bec
> Great suggestion! TI has eval boards available for them so I can
> get up to speed quickly. I guess the idea is that I set it
> up for a gain of 2, and put a 50 ohm resistor in series with the
> output. Now it is a unity gain buffer in a 50 ohm system. A
> signal trying to go through it backw
Depending on how much forward gain you're after, I'd suggest looking at the
LMH6702 current feedback opamp. I keep a few of them around in Hammond
boxes, powered by NiMH rechargeables. Measured S12 is about 70 dB at 100
MHz, and I'm sure it could do at least 40 dB at 200. If I remember
correctl
If you're just using a single attenuator at the input of your PA, it makes
sense that the additive noise in dBc terms is worse at lower output levels.
Disregarding saturation for the moment, the PA is adding just as much noise
to a low-level input signal as it does to a high-level signal.
ALC-con
follow your suggestion to look up Timelab's
enumeration
> function.
>
> 73's de Ulrich, DF6JB
>
> > -Ursprungliche Nachricht-
> > Von: time-nuts-boun...@febo.com
> > [mailto:time-nuts-boun...@febo.com] Im Auftrag von John Miles
> > Gesendet: Frei
You probably want ibfind() rather than ibdev(). Take a look at gpibport.cpp
in the TimeLab source (drivers/shared/gpibport.cpp under the installation
folder), in the enumerate_ports() function.
-- john, KE5FX
Miles Design LLC
> -Original Message-
> From: time-nuts-boun...@febo.com [mai
Check the DIP switch on the back of the 5370B to see if it's in talk-only
mode. (Which is fine, but you'd need to use the Talk-Only selection on the
Acquire menu, rather than the 5370-specific driver.)
-- john, KE5FX
Miles Design LLC
> -Original Message-
> From: time-nuts-boun...@febo.co
> Hi!
>
> Taking a 10MHz signal from a rubidium clock to an external device it is
better
> to use 0.5-1Vrms sine wave or TTL? A 75 ohm coaxial cable will be used
with
> just 1 meter long. In any case the receiver will be made around a
unbuffered
> gate with self biasing (it seems that the 74AC typ
> -Original Message-
> From: time-nuts-boun...@febo.com [mailto:time-nuts-
> boun...@febo.com] On Behalf Of Lizeth Norman
> Sent: Wednesday, November 20, 2013 8:43 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] EZGPIB Question
>
> The programming o
Good to hear the modified driver helped -- thanks for the confirmation!
I'll leave that option in the code for future releases.
There's no compelling reason to use the generic talk-only driver with a
counter that is also supported by a native talk/listen driver, as long as
the latter works reliabl
> -Original Message-
> From: time-nuts-boun...@febo.com [mailto:time-nuts-
> boun...@febo.com] On Behalf Of gandal...@aol.com
> Sent: Wednesday, October 09, 2013 5:28 PM
> To: time-nuts@febo.com
> Subject: Re: [time-nuts] Pendulum CNT91 with TimeLab
>
> Considering that I now know there is
TimeLab will capture and display the *IDN? result as the instrument name,
but it shouldn't reject the connection if it doesn't get what it expects.
How is it behaving when it rejects the data?
You've got to wonder what was going through the heads of the designers of
the various counters that didn'
Not sure if there's anything to worry about, but I don't think there are any
good reasons to do it. The OCXO in the 5370 is an order of magnitude more
stable from one second to the next than the counter's resolution would allow
you to measure at t0=1s.
-- john, KE5FX
Miles Design LLC
> -Or
I've always wanted to try baking the entire tube to vaporize any
accumulations of Cs metal outside the internal oven. Is that what you did,
Paul? If some of the free cesium metal near the detector can be recondensed
at the oven end, or just redistributed uniformly throughout the tube, it
might re
Very nice! Up there with the best of them. I'm curious about the
measurements that are showing 100 kHz PN values in the -183 dBc/Hz neighborhood
on your E5052B (
www.ptsyst.com/10MHzPN-2.pdf ) but only about -177 dBc/Hz on the TimePod (
www.ptsyst.com/10MHzPN-1.pdf ). Was the same pair of os
Normally any higher-order sidebands are ignored when dealing with PM. You
can think of it as NBFM with a very low modulation index -- all of the
"intelligence" is in the first sideband.
Put another way, the modulation index for FM is the peak frequency deviation
divided by the highest frequency p
> I goofed in one of the steps - Step 6 , where i should have selected DC
> on both AC/DC switches , they were unfortunately on AC.
>
> When i power the unit off/on it starts up fine (the start/stop) leds are
> blinking , but the display shows 0.00 , and once in a while if i'm lucky
> it arms and
Don't you just love paying to access research that your taxes already paid
for? Gives you a warm, fuzzy feeling all over. :-P
-- john, KE5FX
Miles Design LLC
> -Original Message-
> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
> Behalf Of David McGaw
> Sent: Fr
ture does not time out, just the acquisition itself.
>
> Adrian
>
> John Miles schrieb:
> > What GPIB adapter are you using? Does the 'Monitor' feature also time
out,
> > or just the acquisition itself?
> >
> > -- john, KE5FX
> > Miles Desi
What GPIB adapter are you using? Does the 'Monitor' feature also time out,
or just the acquisition itself?
-- john, KE5FX
Miles Design LLC
> -Original Message-
> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
> Behalf Of Adrian
> Sent: Wednesday, August 21, 2013
Mark, I'm having trouble replying to your email, as your ISP is using a spam
blacklist (SORBS) that blocks the SMTP servers used by the largest American
cable ISP. Do you have another ISP you can use to receive email?
-- john, KE5FX
Miles Design LLC
_
> j...@miles.io said:
> > Agreed, nobody should be using RS232 for anything nowadays.
>
> RS232 works much better for capturing PPS timing.
Unless you are watching it with a ring-0 (kernel) driver, and/or using a
hard realtime OS to run the client software, it really won't matter that
much. Anyo
Agreed, nobody should be using RS232 for anything nowadays. USB doesn't
seem to cause noise problems in equipment that works at the -170 dBc/Hz and
below level (ahem) so it will be good enough for most other sensitive
applications, assuming good design/layout practices are followed.
USB support c
tting and the display rate setting on the 5370.
> When I follow the process below the results are totally consistent.
>
> Sorry to taken your time and thanks all for your help. Now to find the
> original issue.
>
> Bob Darby
>
> On 7/7/2013 8:57 PM, John Miles wrote
> -Original Message-
> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
> Behalf Of Robert Darby
> Sent: Sunday, July 07, 2013 3:33 PM
> To: time-nuts@febo.com
> Subject: Re: [time-nuts] Question about effect of sample interval on ADEV
>
> Thanks to all who respond
This won't be a sampling-interval issue. It sounds like a beat note. To
diagnose it, you can use the 5370B in frequency mode (with its internal
timebase) to measure the frequency of the 5065B and the FTS 1050B. Subtract
the two readings, then see if the reciprocal of the frequency difference
co
> Hi John:
>
> How can I make a noise floor plot for my HP 4395A?
> http://www.prc68.com/I/4395A.shtml
Those plots came from my old freeware app ( http://www.ke5fx.com/gpib/pn.htm
). It supports the 4396A but not the 4395A; see
http://www.ke5fx.com/4396a.gif for the baseline plot that someone se
> I just had a discussion about older spectrum analyser versus the new Rigol
type
> SA.
>
> They are saying the Rigol is -80dBc.
>
> Unfortunately I don't know what the specs of mine are.
> Could someone help me out with some noise floor figures for the following?
>
>
> * HP 8566A
>
>
pment. No animals were harmed in
the making of these videos, although some valence electrons were temporarily
inconvenienced.)
-- john
Miles Design LLC
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and follow the instructions there.
Could also be worth considering the C-MAC STP 2055B DOCXOs being sold out of
China at the moment ( http://www.ebay.com/itm/170471367031 ). Out of 14
units that I bought, three were excessively noisy and/or jumpy, eight were
good for <= 2E-12 at t=1s, and three were exceptional performers <= 3E-13
ill not trigger immediate
updates of the release build.
-- john
Miles Design LLC
> -Original Message-
> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
> Behalf Of Tom Knox
> Sent: Friday, May 10, 2013 3:33 PM
> To: Time-Nuts
> Subject: Re: [tim
Hi, Wei --
As Magnus mentions, the former 5330A is now sold by Symmetricom as the 3120A,
with identical hardware and very similar software. You'd need to check with
your regional Symmetricom reseller for an accurate price quote. Most of the
non-US distributors are selling them for US $12,000
Yes, those messages are just there to warn users that if they try to record
multi-million point phase records, they may either run out of memory or
generate a gigabyte+ file that will be painfully slow to work with. The
warning threshold is quite a bit higher in the 64-bit version but it will
stil
As JohnA says there's no hard limit on the duration for phase data logging,
other than available RAM. She would definitely want to use a 64-bit PC for
this. The TSC 5120A cranks out phase data at 1000 samples per second by
default, so even a well-endowed 64 bit PC will run out of memory when tryi
> -Original Message-
> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
> Behalf Of Mark C. Stephens
> Sent: Thursday, May 02, 2013 9:29 PM
> To: li...@lazygranch.com; Discussion of precise time and frequency
> measurement
> Subject: Re: [time-nuts] Measuring Phase
> Close, but it's for the 105, not the 5061, and the boards are physically very
> different.
The 5061A upgrade used those 105-series boards. With the 5061B, they changed
the part number of A1A3 (the OCXO interface board) from 00105-6044 to
05061-6198, but I don't see any major differences in th
Very nice bit of R&D work on Corby's part. Mine is certainly working well
after the modification, but I'm just blown away at the performance seen with
Tom's unit.
Another plot of the "Super" mod that's worth mentioning:
http://www.ke5fx.com/5065A_vs_maser_mask.png
Below 1000 seconds it has no tr
y directly.
-- john, KE5FX
Miles Design LLC
> -Original Message-
> From: John Miles [mailto:jmi...@pop.net]
> Sent: Sunday, April 21, 2013 12:14 PM
> To: 'Discussion of precise time and frequency measurement'
> Subject: RE: [time-nuts] T-Bolt Mon and Windows 7
>
>
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