Hello,
And about temperature, in this article
http://www.dtic.mil/dtic/tr/fulltext/u2/a495520.pdf there is an
interesting point, in the last page: Riley answer to the question "You
mentioned larger cells. Where there any other things done go get these
fantastic results?
Regards,
Javier
On
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Chief Technology Office
Hello,
Tait T800 is a series of mobile radio repeaters, so probably the T801
could be a unit intended for iso-frequency networks, in which there are
several repeaters are distributed in a wide area operating all at the
same frequencies with a very tight tolerance. BNCs and 13.8V power
supplie
Hello,
The calibration certificate does not indicate that the measurements were
done with the frequency counters referenced to the 5071A at the time of
calbiration (if so, it would be listed under the Calibration Equipment
Used table). It says that the 53132A were calibrated against the 5071A.
Hello, Jim,
I suppose that one of the alternatives that you've explored are the
ABLNO from Abracon http://www.abracon.com/Precisiontiming/ABLNO.pdf
They say that they are 3rd overtone, but it seems more an AT-cut than a
SC, and anyway is around 10dB poorer than your requirements. An I
suppos
Hello,
This is an article published in one of the main newspapers in Spain,
about the timekeeper at ROA, the institution responsible of legal time
in Spain.
http://www.elmundo.es/ciencia/2015/06/30/559189c622601d6b4e8b4594.html
It is in spanish, but has pictures :)
Regards,
Javier
___
Hello!
On 18/12/2014 5:37, Magnus Danielson wrote:
Ed,
On 11/15/2014 04:38 PM, Ed Palmer wrote:
Yes, I'm sure. I did check the cabling. :) If I was somehow measuring
the Tbolt or 4065A against itself, there wouldn't be any frequency
offset.
The Oscilloquartz 3210 (which appears to be an O
On 28/09/2014 17:44, Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
BTW, you may note Keysight's uncertainty for measurement of the 10 MHz
reference in September 2014 is 0.0010 Hz, whereas Agilent's was
0.00080 Hz in August 2013. They 5071A primary frequency standard. I
assume the fact that the
PM, Chris wrote:
On 08/28/14 19:53, Javier Herrero wrote:
Hello,
Then it is a quite different beast to the EUDICS 3120, that they also
call OSA-3120... I note now that yours is a 3210, not 3120 :)
Regards,
Javier
The 3210 looks like a much earlier design, prior to the inclusion of
microprocesso
, Chris wrote:
On 08/28/14 05:03, Javier Herrero wrote:
Hello,
Here is the manual I've. I have also some other documentations, and some
Oscilloquartz software for the OSA-5585, but I don't know if they are
very useful.
Regards,
Javier
Hi Javier,
Thanks for that and for the other re
Hello,
I've some manuals from an OSA-5585, one of them for the EUDICS 3120. The
thing that Symmetricom calls EUDICS-3120 really is a FTS-5045 module
(Symmetricom in my case), that I think that it is the same that is
inside the FTS-4060. It seems that one common problem with these,
discuted so
Hello,
Supply voltage is 24V. I've no information of the control voltage range
and slope.
Regards,
Javier
On 26/07/2014 7:02, davidh wrote:
Hi All,
Can anyone advise the supply voltage and range of the control voltage
for these gadgets?
Cheers,
david
___
Hello,
There are two types of NTC thermistors that are (very) frequently used
in spacecrafts, the Measurement Specialties (traditionally YSI, Yellow
Spring Instruments) 44907 and 44908, that are 10k @ 25ºC NTC:
http://meas-spec.com/downloads/44908.pdf and
http://meas-spec.com/downloads/44907.
Hello,
Wind speed usually in meters/sec (when used for scientific data) or km/h
(used in the news, so the people can compare with car speed ;) )
Pressure in millibars. Meteorologist also usually refers to
hectopascals, but it is more for representing something at a given
altitude (for example,
Hello,
I think that not as a direct replacement of the 1173. The 1175 has
32-bit phase increment resolution and 10-bit DAC output. The 1173 has
48/12 bit.
Regards,
Javier
On 14/05/2014 17:13, cdel...@juno.com wrote:
Hi,
I found two PLCC STEL 1175 in a rack mounted synthesizer I have.
I'd
On 18.04.2014 19:17, Andrea Baldoni wrote:
Hello.
In the lab, I would like to have an event counter that can double as
frequency/period counter, with maximum clock rate in the order of the tens
of Hz or so, better with TIC function (aka "chronometer"). Resolution need
not be better than 1/100s,
On 07.04.2014 18:51, Dan Kemppainen wrote:
At which resolution do you wish to get 40Msps? Tell me the single-shot
jitter figure. So far we had only several ksps of throughput in our TDC
circuit, but the bottleneck lies within a computer interface.
Anyway, it is not an easy task to get some 200MB
On 03.04.2014 18:25, Azelio Boriani wrote:
Other idea than leaving the 6K8 resistor?
Yes... I would prefer to know why the little thing has stopped working.
The 6k8 resistor has also probed to be a marginal solution. The
operational amplifier is a Burr-Brown one (don't have the p/n at hand
n
014, at 11:08 AM, Javier Herrero wrote:
Hello all,
I've a C OCXO (inside a Symmetricom 5045A that is inside an Oscilloquartz
OSA 5585) that refuses to start. It seems that one voltage regulator is not
operating, with only 2V at its output while it should have (I think...) around
1
Hello all,
I've a C OCXO (inside a Symmetricom 5045A that is inside an
Oscilloquartz OSA 5585) that refuses to start. It seems that one voltage
regulator is not operating, with only 2V at its output while it should
have (I think...) around 12V. I've partially analyzed the circuit, and
it
On 27.01.2014 19:33, Robert Atkinson wrote:
All the receiver chips I've looked at, ancient and modern, have only positive
thresholds. Most have single supplies and clamp the input at 1 diode drop
negative WRT common after an input current limiting resistor, see the MC1489
datasheet.
Hello,
On 27.01.2014 15:08, Attila Kinali wrote:
In practice, the receiver chip only has one power supply. It would take
extra work to make the switching threshold below ground.
That's not correct. Standard transceiver chips (like the MAX232 family)
have an integrated charge pump to get a negative pow
Hello,
On 06.08.2013 17:25, Chris Albertson wrote:
The current Linux kernel has a PPS GENERATOR. See "pps_gen_parport"
Put WHY would you need this? The documentation for pps_gen_parport suggests
only using it for crude synchronization of sevel computers but NTP would in
every case work bette
On 07.06.2013 19:23, Perry Sandeen wrote:
List,
Another hardware possibility.
Double the 10 MHz to 20 MHz.
With another circuit of 74HC390’s divide 10 MHz to
200 KHz. Then double it twice to 800 KHz
with LM 1496 DBM’s. Apply the two
frequencies to a LM 1496 DBM and use a LPF to get th
d-2-Square-Wave-/400352450150?pt=LH_DefaultDomain_0&hash=item5d36dd9666
Regards,
Javier
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Javier Herrero
Chief Technology Officer EMAIL: jherr...@hvsistemas.com
HV Sistemas S.L.
Hello,
These people seems to have them availabe at single quantities for $65...
perhaps not in the right packaging:
http://www.questcomp.com/questdetails.aspx?pn=STEL-1173%2FCL&pnid=372732&stock=Yes
(I've never purchased from them... si I cannot encourage or discourage :) )
Regards,
Javier
On 31.03.2013 17:32, Lizeth Norman wrote:
All u guys that post code to push up your little ego and then don't help
when it sucks need to see a shrink.
Don't want emails, don't post. Keep your bad code in the folder were it
belongs.
Are you suppossing that anybody that releases any code must pro
On 18.01.2013 22:41, shali...@gmail.com wrote:
10.059 used to be a standard frequency for some 8051 microcontrollers. Should
not be too hard to find.
No, it was 11.0592
Regards,
Javier
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Hello all,
Please excuse me for the OT, but since this list is plenty of very
knowledgeable colleagues, I'm tempted to ask...
I need to cool several resistive loads, in the order of 5kW, and I plan
to use a cold plate and a liquid-to-liquid heat exchanger like the
Lytron LCS-20, but this uni
I asked for a quotation to one spanish distributor about a year ago. It
was quoted at 977 EUR for a single unit, for the newer Thunderbolt E.
$465 seems not bad for that unit.
Regards,
Javier
El 01/10/2012 18:53, Chris Albertson escribió:
On Mon, Oct 1, 2012 at 9:27 AM, Don Latham wrote:
El 01/10/2012 11:22, Hal Murray escribió:
t...@westwood-tech.com said:
information appeared to be non-existent. IMHO for pretty much *everything*
that is for sale, if you have to ask for the price it is a scam.
Yes, when it says "call for pricing", I usually drop interest. But I
wouldn't say
El 29/09/2012 19:11, Joe Leikhim escribió:
I would have to agree that a lot of engineer and tech types fall into
these categories. If not, we would probably not have and GPS
satellites, cellphones and supersonic planes.(where is my hoverboard?)
Not sure. Asperger is a type of autism, and a
titude and velocity.
Well, but since the $150 wrist watch class usually does not provide a
microsecond hand, I suspect that this would pass inadverted :)
Regards,
Javier
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Chief Technolo
El 30/08/2012 20:53, saidj...@aol.com escribió:
There are some drawbacks to this type of SC-cut MCXO I would think, and it
could possibly be replaced by a much higher performance Symmetricom CSAC,
probably at a lower cost and higher availability:
* Q-tech MCXO is ITAR controlled, CSAC is not
After watching Blade Runner (the director cut) reposition on a TV
channel, that ended just one minute before 2am local time, I watched my
nixie clock to, as I was expecting, held 02:00:00 (local time) by two
seconds. Surely its GPS (an M12T) sent the right time to the uC,
23:59:60 UTC... but I'
It can be a reference. I was not meaning a good one :) And surely it is
not that bad as a clock.
El 26/06/2012 15:32, Azelio Boriani escribió:
OK, in my opinion the iPhone is not a reference but, well, if you say it is
then OK.
On Tue, Jun 26, 2012 at 3:20 PM, Javier Herrero wrote:
See
See below, after /tvb ;)
El 26/06/2012 15:08, Azelio Boriani escribió:
Yes, and the reference?
On Tue, Jun 26, 2012 at 2:32 PM, Tom Van Baak (lab) wrote:
With four points one can compute ADEV...
/tvb (iPhone4)
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El 12/06/2012 13:09, David J Taylor escribió:
I run Dimension 4 as a time standard on my POC's, mainly for using
JT65 digital radio communications. It polls tick.usno.navy.mil for the
time. I have noticed since getting my ThunderBolt set up that the GPS
time is about 15 seconds in advance of my P
El 12/06/2012 08:50, Chris Wilson escribió:
It has also always shown a "Leap Second Pending minor alarm, but I
believe this is quite usual?
Hello, it is usual now since there is a leap second scheduled for next
30-Jun. After that day, it will disaappear... until next one :)
Regards,
Javie
El 09/06/2012 09:35, Chris Albertson escribió:
On Fri, Jun 8, 2012 at 11:22 PM, Ed Palmer wrote:
... It is programmable over a wide frequency range (typically < 100 Hz to
15-20 MHz), but you have to bring out the signal yourself,...
Any idea WHY someone would design something like that? A
.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
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--------
Javier Herrero
Chief Technology Officer EMAIL: jherr...@hvsistemas.com
HV Sistemas S.L.
ouple 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 2:19, Javier Herrero
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 direc
El 07/05/2012 11:20, Attila Kinali escribió:
But to bring this back to time nutty topics, have a look at
http://www.colorfly.eu/product.html It's an MP3 player with high
precision timing. It does not only use two TCXOs with <5ps Jitter..
No! It also employes a technique known as "Jitter Kill" f
No, there are a lot more messages from him since at least 2008 and last
one in the chinese scopes thread some days ago. The e-mail origin seems
quite authentic from the headers, so I suspect he has sent it to the
list in error :)
Rgds,
Javier
El 21/04/2012 00:50, Bill Hawkins escribió:
[Par
El 09/04/2012 16:59, Tom Knox escribió:
I have heard the definition of a "Time Lord" is someone who has more then one
clock and still knows what time it is.
Thomas Knox
No, no, is someone who know what time it is without needing a clock :)
Regards,
Javier
El 08/04/2012 04:31, Magnus Danielson escribió:
Oups, there is currently 7 caesium clocks in my lab (not all mine) and
I'm not there to protect them all. Lost count of rubidium...
Hum. 7 Cs clocks and lost count of Rb... and you're not there to protect
them all... give me the address, I wou
at they are free
except for a 5000 EUR management fee...
Best regards,
Javier
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------------
Javier Herrero
Chief Technology Officer EMAIL: jherr...@hvsistemas.com
HV Sistemas S.L. PHON
El 08/04/2012 00:21, Jim Lux escribió:
On 4/7/12 10:08 AM, Javier Herrero wrote:
El 07/04/2012 16:02, Jim Lux escribió:
RTEMS might be just what you need. Kernel, basic OS calls for
scheduling, queues, etc. It's nice when you decide you want threading
to not have to graft it into a
El 07/04/2012 16:02, Jim Lux escribió:
On 4/7/12 4:47 AM, Javier Herrero wrote:
I'm very familiar with the LEON and RTEMS, having managed a software
development project with it for the last 3 or 4 years at work.
http://www.gaisler.com/ for LEON
http://www.rtems.org/ for RTEMS
I will h
El 07/04/2012 18:17, shali...@gmail.com escribió:
When you install the Altera tools, it automatically installs NIOS and gcc. I
assume there are no restrictions for private use, but you may have to send $ if
you make a commercial product. That remains to be checked.
With the Quartus Web, you ca
El 07/04/2012 13:19, Azelio Boriani escribió:
The Xilinx and Altera have their embedded CPUs (Microblaze and Nios) IP.
I'm not familiar with them and don't know how much they cost. Until now I
have developed on Xilinx 50Kgates FPGA and 128 cells CPLD with the Xilinx's
free tools.
Mostly expensiv
El 05/04/2012 12:20, Azelio Boriani escribió:
On a side note, speaking of deterministic systems, why has no one built a
GPSDO with an FPGA yet? Or an NTP server? :)
Oh, I've done that (an NTP server, not GPSO) in a Cyclone III FPGA. But
well... it has a Nios-II CPU and runs Linux, so I suppose
El 05/04/2012 00:58, gary escribió:
That is the AMD speed step, but doesn't intel do the same thing?
I suppose so. In any case, under Linux you can force off the speed step
(i.e. force the CPU to a fixed clock). I did that some time ago in a
Dell server with a dual quad-core Opteron with Fedor
El 02/04/2012 16:14, J. Forster escribió:
If the FTL neutrino "discovery" had been kept quiet until fully vetted, he
probably would not have had to resign.
I suppose so... Also, things would have been completely different if the
60ns error would be of the opposite sign, that would lead to the
I suppose that when it was photographed, nobody noticed it. After
noticed that it was no correctly plugged-in, the past pictures were
reviewed and found that in fact it was not fully plugged in :)
El 31/03/2012 01:04, iov...@inwind.it escribió:
May anybody out there explain why the connector w
El 30/03/2012 16:55, Javier Serrano escribió:
On Fri, Mar 30, 2012 at 3:07 PM, iov...@inwind.it wrote:
http://inagist.com/all/185697069783195648/
Personally I'm sorry about such an end of the story.
There was a meeting in Gran Sasso on Wednesday. You can see some of
the slides at
http://age
El 30/03/2012 05:02, Jim Lux escribió:
and orientation. Sort of like a super star tracker all in one! (You
can see why NASA is interested..)
And ESA. Last year they published an invitation to tender called Deep
Space Navigation with Pulsars, with the following description excerpt:
The a
El 26/03/2012 22:30, Azelio Boriani escribió:
120CHF + the custom duties. Even if in the EU.
Switzerland is not part of EU :) Although it is part of Schengen Area.
Regards,
Javier
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something I haven't seen before,
but technically
1N914BWT != 1n914. That is, in the strict sense, the 1n914 has to be a
diode in that glass package.
On 3/25/2012 5:48 PM, Javier Herrero wrote:
El 26/03/2012 02:35, gary escribió:
I forgot to mention that those old jedec part numbers spec
El 26/03/2012 02:35, gary escribió:
I forgot to mention that those old jedec part numbers specify a
package and electrical limit under one part number. That is, you can't
find say a 1n914 in SMD, but you can find direct equivalents with
other numbers. You will find supply houses listing SMD ver
13ps resolution at 200Msps sampling rate and real 15.8Msps output data
throughput? not too many around :)
Regards,
Javier
El 21/03/2012 15:44, David escribió:
I am surprised it is not more accurate and precise. Even old discrete
designs can get down to 10ps or better. I wonder what mark
available at once? Why
nobody had pointed out that there was the ICARUS data processing in
progress?
On Fri, Mar 16, 2012 at 10:03 PM, Javier Herrerowrote:
The paper is this one, dated yesterday:
http://arxiv.org/ftp/arxiv/papers/1203/1203.3433.pdf
Regards,
Javier
El 16/03/2012 21:50, Javier
The paper is this one, dated yesterday:
http://arxiv.org/ftp/arxiv/papers/1203/1203.3433.pdf
Regards,
Javier
El 16/03/2012 21:50, Javier Herrero escribió:
I think that this is the article: http://arxiv.org/pdf/1110.3763.pdf
It is not strange that the results are available now. These
I think that this is the article: http://arxiv.org/pdf/1110.3763.pdf
It is not strange that the results are available now. These experiments
are run during months, and generates a large quantity of data.
Best regards,
Javier
El 16/03/2012 21:19, Azelio Boriani escribió:
OK, that is, are the
Hello,
AT cut crystals can be manufactured both as a round disk or as a strip
resonator, so probably they are AT. For example, these are:
http://cfm.citizen.co.jp/english/product/pdf/HC-49_U-S.pdf and
http://cfm.citizen.co.jp/english/product/pdf/CSA-310_309.pdf
Regards,
Javier
El 13/03/201
Don forget the PSD813 :) It provides 128KB Flash and 8KB RAM... so it
can be a bit more complicated
Regards,
Javier
El 17/02/2012 11:09, Azelio Boriani escribió:
In my opinion you don't need the power of an IDA-class disassembler to
process an 8051-like code. The MCS51 family processors have
pared with the 10MHz unit, roughly a 20dB increase at 10Hz,
a more or less 12dB increase at 100Hz, 6dB at 1000Hz, and around 3dB
from that point.
Regards,
Javier
El 13/02/2012 16:45, Javier Herrero escribió:
Thanks for your answers, Magnus and John. For now, I will take the
12dB value as a sta
Thanks for your answers, Magnus and John. For now, I will take the 12dB
value as a starting point until further confirmation.
Regards,
Javier
El 13/02/2012 10:32, Magnus Danielson escribió:
On 02/13/2012 10:16 AM, John Miles wrote:
That is exactly my thinking, but I was looking for a second
Hi, Magnus,
El 13/02/2012 09:06, Magnus Danielson escribió:
On 02/13/2012 08:28 AM, Javier Herrero wrote:
Hello all,
I'm planning to use in an application this oscillator
http://www.abracon.com/Precisiontiming/AOCJY.pdf in the 40MHz version.
The phase noise data in the data sheet is fo
Hello all,
I'm planning to use in an application this oscillator
http://www.abracon.com/Precisiontiming/AOCJY.pdf in the 40MHz version.
The phase noise data in the data sheet is for the 10MHz version. Is it
possible to "extrapolate" these numbers to what I could expect in the
40MHz version? A
El 10/02/2012 00:13, Javier Herrero escribió:
El 09/02/2012 22:28, Magnus Danielson escribió:
Consider that it is de-modulated and then low-pass filtered.
Also, it is the alternating rate and not 1400 Hz difference in DDS
setting which is the key parameter here. The 1400 Hz gives a hint of
El 09/02/2012 22:28, Magnus Danielson escribió:
Consider that it is de-modulated and then low-pass filtered.
Also, it is the alternating rate and not 1400 Hz difference in DDS
setting which is the key parameter here. The 1400 Hz gives a hint of
the Q-value however, which seems to be lower on
Hello,
El 09/02/2012 21:06, Magnus Danielson escribió:
I was just thinking about that. For these more modern 5680A, just the
Q of the resonance and the loop filter / loop bandwidth would not
allow for so much high frequency side-bands of the DDS to pass through.
The loop filter at least shoul
El 09/02/2012 01:40, Bob Camp escribió:
Hi
Here is a little more on how much of a problem you have.
If you would like the spurs to be down 70 dbc at 10 GHz. They go up by 20 log
N. in this case N is 1000. That gets you 60 db. Spurs at 10 MHz would have to
be down at -130 dbc to make it at 10
El 05/02/2012 22:27, John Miles escribió:
John
Thank you for your effort. It would be nice if you could confirm the 4 to
5
Hz dither that seems to be the loop time constant and long term aging
that
will influence the GPS/Rb control loop time constant setting. I did see 1
E-12 per month wh
Hello, John,
Your phase noise plot seems quite similar to that sent by Said some time
ago (4 Jan), that looks like a lot of spurs quite evenly separated. It
is likely from the price and p/n that your unit is one of the "newer"
ones with 60MHz xtal and the DDS inside the loop - and I would thin
Me too. I think that this is a transient that will surely decay... and
that also is leading to several constructive sub-threads that are not
directly related with the FE-5680A but nevertheless very interesting and
very "time-nut" related. I'm not interested to subscribe another list
that probab
I forgot... have you had the opportunity to check if the difference
between the two DDS programming words is the same in all cases? All my
readings leds to 1400.00x Hz, I've not looked at it but probably the
difference in DDS counts is constant.
Regards,
Javier
El 02/02/2012 10:13, J
Great plot :)
I've a dump of the SPI transfers during a night taken with the logic
analyzer... but have found no time yet to process the dump to extract
the transfers. Of course it is easier to take it from the serial port
data :)
The adjustment looks quite closely related to the temperature
El 31/01/2012 21:47, Attila Kinali escribió:
This was exactly the device i intended to use.
But it doesnt really have 32bit timers. They cascade two 16bit timers
to get 32bit, but then all kind of restrictions apply which make the
timers unusable. And when using 16bit timers, i'll get an overfl
El 31/01/2012 20:43, Attila Kinali escribió:
My current progress is that the uC i wanted to use does not do what i
want. Can anyone recommend a uC with 32bit timers and IEEE 1588 support?
You can have a look on these
http://www.ti.com/mcu/docs/mculuminaryfamilynode.tsp?sectionId=95&tabId=2597&f
El 31/01/2012 02:52, Magnus Danielson escribió:
On 31/01/12 02:20, Bob Camp wrote:
Hi
Simple answer is don't bother.
More complex answer - of course you can. You will get a forest of
spikes (every 5, MHz or so ).
Also, since the 5,3 MHz is modulated, 1,4 kHz apart is the two
signals, and t
El 30/01/2012 03:19, Chris Albertson escribió:
On Sun, Jan 29, 2012 at 10:19 AM, Javier Herrero wrote:
El 29/01/2012 14:45, Bob Camp escribió:
My next intention is to replace the OCXO in one of my Thunderbolts with a Rb
and use a small microcontroller to get the voltage correction from the
, Bob Camp escribió:
Hi
If you try to do full scale, check the range of your VCXO first. The digital
test is much easier if you already know where your VCXO stops tuning.
Bob
On Jan 29, 2012, at 1:45 PM, Javier Herrero wrote:
I'm now gathering the unit self-updating of DDS data, that
gards,
Javier
El 29/01/2012 19:37, Scott Newell escribió:
At 05:45 AM 1/29/2012, Javier Herrero wrote:
For example, the following data has been gathered:
Serial offset 00 00 00 00
DDS A word: 44 02 62 F6 = 1141007094 = 5 313 228.32219 Hz
DDS B word: 43 FD CC 8E = 1140706446 = 5 311 828.32085 Hz
Ca
El 29/01/2012 14:45, Bob Camp escribió:
Hi
Very interesting.
It sounds like dithering would be needed to get down to parts in 10^-14. If we
do that from an external device (PC / PIC / FPGA / whatever) it would be useful
to know the delay between the serial command and the DDS update. The more
El 29/01/2012 13:57, Magnus Danielson escribió:
Hi Javier,
On 01/29/2012 12:45 PM, Javier Herrero wrote:
Hello,
As it has been discussed in the past days, the architecture of the newer
FE-5680A that has been recently purchased by a lot of us does not led to
a trimming resolution through the
Hello,
As it has been discussed in the past days, the architecture of the newer
FE-5680A that has been recently purchased by a lot of us does not led to
a trimming resolution through the serial port of 1.7854e-7Hz, but rather
leds to think that the trimming resolution is in fact 6.80789e-6Hz
for these FE-5680A.
I'm starting to suspect that the claimed resolution of 1.7854^-7Hz is
only for a serial protocol compatibility reason, and that really the
effective tuning step for these Rbs is in fact around 6.81^-6Hz.
Regards,
Javier, EA1CRB
El 28/01/2012 20:44, Javier Herrero
both.
Ed
Javier Herrero wrote:
Sat Jan 28 18:38:53 UTC 2012
It can be... but the resolution of the center frequency of two DDS
frequencies would be limited to half DDS LSB... so not enough. I will
try to monitor FSELECT and also to extract some SPI data if I found some
free time today o
Only to note that I measured at the wrong place... the reference
frequency to the DDS is 20MHz, not 10MHz as I stated :)
Regards,
Javier, EA1CRB
El 28/01/2012 15:21, Javier Herrero escribió:
El 27/01/2012 19:27, beale escribió:
I added a bit to the "electronics" section of th
I will try to play a bit more this evening :)
Best regards,
Javier
--
--------
Javier Herrero
Chief Technology Officer EMAIL: jherr...@hvsistemas.com
HV Sistemas S.L. PHONE:
uot; by variying the
duty cycle at FSELECT.
I will try to play a bit more this evening :)
Best regards,
Javier
--
--------
Javier Herrero
Chief Technology Officer EMAIL: jherr...@hvsistemas.com
HV Sistemas
El 28/01/2012 00:17, claudio.gira...@virgilio.it escribió:
Hello John,
thanks for maintaining the 5680A FAQ;
regarding its
frequency resolution, have you checked the DDS FSELECT pin (and maybe
also PSEL0/1) to see if they are doing some kind of "dithering" of the
DDS frequency ?
I've just checke
El 23/01/2012 21:43, Jim Lux escribió:
One is where you "lay the iphone on the table" in a fixed position.
One could use the internal accelerometers to determine "level", but I
don't think you could tell orientation, unless, perhaps, you can see
circumpolar stars? That is, by watching the
El 23/01/2012 19:29, Chris Albertson escribió:
So back to time. If the goal is keeping good time then it is best
not to use Microsoft Windows. There are good technical reasons having
to do with the way MS Win. keeps and adjusts time. The bottom line is
that you will never be able to do bet
Hello,
I've several data sets of frequency measurements taken at 500us
intervals, and would like to extract phase noise data from them. In
order to do a consistency check with my processing, could I request some
help from any of you that have available Stable32 or other similar tool
to proces
El 13/01/2012 04:57, brent evers escribió:
Hijacked thread. Yes - this would be great to see done on a linux
machine. I don't know that much about LH, but something done cross
platform (PyQt or such - could make binaries for win, linux, and mac)
in a server/client config would be great. I do
Hello,
What kind of power supply are you using for it? If a switching one,
perhaps this is the origin.
Regards,
Javier, EA1CRB
El 12/01/2012 11:39, Chuck Forsberg WA7KGX N2469R escribió:
I received my Ebay Tek 2712 spectrum analyzer Monday and I have been
throwing software to read its data
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