Am Tue, 10 Apr 2018 17:43:25 +1200
schrieb donald collie :
> I`ve just bought two GPSDO`s from China @ US$9-50 each [This is not an
> error!] They are stated as being new, and use a Trimball dual oven
> OCXO. I plan to run these in parallel [2 antennas, 2 feedlines, and 2
> GPSDO`s] It`s been said
The obvious trick would be to choose their distance such that
only their noise cancels...
SCNR,
Florian
Am Sat, 5 Aug 2017 01:09:00 +0100
schrieb Adrian Godwin :
> Don't put it anywhere near your hydrogen maser or they'll cancel each
> other out.
>
>
> On Sat, Aug 5, 2017 at 12:55 AM, Christop
Am Thu, 13 Oct 2016 17:57:02 -0500
schrieb "Graham / KE9H" :
> Actually, if they have the "CE" stamp on the product, then they have
> very specific radio interference limits that they must test and meet.
> It must have been tested, certified, and the certification package
> available for inspectio
Am Wed, 29 Jun 2016 12:28:50 -0700
schrieb Hal Murray :
>
> bro...@pacific.net said:
> > At one point they were looking into making a GPS time receiver
> > where the cable length calibration would be built-in.
>
> How would you do that?
>
> The obvious way is to compare the time you get with a
Am Fri, 13 May 2016 20:28:04 -0500
schrieb David :
> It figures that HP would have done this if anybody had. I am not that
> familiar with their design history so thanks for bringing this to my
> attention.
>
> I did not find anything in the theory section of the original service
> manual althou
Am Mon, 18 Apr 2016 18:15:22 -0400
schrieb Bob Camp :
> Hi
>
> If our approach was to fabricate an IC totally from scratch for this
> or that application, there are a lot of things that could be done.
> Unfortunately, for most of us, doing that to wire up an output on a
> board … not so much.
>
Am Sun, 17 Apr 2016 23:03:11 +0200
schrieb Gerhard Hoffmann :
> Am 17.04.2016 um 16:59 schrieb Wojciech Owczarek:
> > A slightly naive question(s) perhaps, so do excuse me, but I reckon
> > this is a good opportunity to ask since I am approaching the same
> > design questions (this is a 1PPS in +
Am Mon, 28 Mar 2016 03:20:14 +
schrieb Mark Sims :
> > Mil-spec parts would be somewhat more reliable than commercial
> > parts.
> Actually, that is seldom true. The main difference between mil-spec
> parts and commercial parts tends to be in the post-packaging device
> testing (e.g.. exte
Am Mon, 28 Mar 2016 01:32:03 +0200
schrieb Attila Kinali :
> Yes, the MTBF is a very simplicistic measure and there are a couple
> of assumptions in its calculation which do not hold generally (or
> rather, it's rather seldom that they hold). Yet it gives a number to
> something that is otherwise
Am Sat, 13 Feb 2016 18:41:02 +1300
schrieb "Dave Brown" :
> Cobham is a UK based defence and high end security supplier-
> originally formed (not too many years ago) by their buying out of
> several other companies in their lines of business. More recently
> they have got into aerospace activitie
Am Thu, 12 Nov 2015 18:14:57 -0800
schrieb "Richard (Rick) Karlquist" :
>
>
> On 11/12/2015 1:01 PM, William Schrempp wrote:
> >
> > has failed. I hear old machinists complaining about new machinists
> > who can't drill a hole if the drill-press isn't
> > computer-controlled. And in my work, nur
Am Sat, 31 Oct 2015 10:50:36 +
schrieb Chris Wilson :
>
>
> 31/10/2015 10:46
>
>I have a Racal counter locked to 1 MHz on its rear panel external
>input socket from my Trimble Thunderbolt GPS. I derive the 1 Mhz
>from a David Partridge divider board. If I also feed the counter
Am Sun, 25 Oct 2015 13:34:43 +
schrieb Wojciech Owczarek :
> I think this is a classic case of confusing application security with
> network security. The whole idea relies on spoofing packets. A
> spoofing scenario is only realistic in a lab setting. Or in case of a
> physical takeover of a c
Am Sun, 25 Oct 2015 07:14:24 +
schrieb "Poul-Henning Kamp" :
>
> In message <20151024123614.7bbfe...@aluminium.mobile.teply.info>,
> Florian Teply writes:
>
> >But if I read that article on ars technica correctly, it looks like
> >it is somet
Am Wed, 21 Oct 2015 22:54:15 -0700
schrieb Rob Seaman :
> Mark Sims said:
>
> > Ars Technica just put up a piece on the effects of various attacks
> > on NTP with a link to the original paper.
> >
> > http://arstechnica.com/security/2015/10/new-attacks-on-network-time-protocol-can-defeat-https-a
Am Tue, 13 Oct 2015 18:54:58 +
schrieb "Poul-Henning Kamp" :
>
> In message <4FD0F30EBAEF49609DF207E3EE61C15B@pc52>, "Tom Van Baak"
> writes:
>
>
> >I used to rely on one massive UPS (along with natural gas generator)
> >for my entire lab. Eventually I found it more reliable and con
ing interactively and then just save the output to a file. Once
> you've got used to how it all works (and there isn't much to it) you
> can set up a more robust software system.
>
That's exactly what I'm planning to do. In the end it will always need
some sort of testing
Hi guys,
I seem to recall that someone on this list mentioned that he's using a
Thurlby-Tandar TF930 or 960 Frequency counter. As I'm considering to
buy such a unit for some experiments at my workplace, I figured I'd
better ask around here for some suggestions.
Has someone already used one of the
Am Thu, 19 Mar 2015 22:26:15 +0100
schrieb Attila Kinali :
> Moin,
>
> On Thu, 19 Mar 2015 21:50:03 +0100
> Florian Teply wrote:
>
> > My guess would be slightly different: the fundamental mode of
> > oscillation could be considered the lowest energy state o
Am Thu, 19 Mar 2015 14:17:58 +0100
schrieb Attila Kinali :
> On Wed, 18 Mar 2015 21:19:55 +0100
> Florian Teply wrote:
>
> > > Good, I am not alone.. I felt stupid not being able to find
> > > something this basic.
> > >
> > Maybe we are stupid not be
Am Wed, 18 Mar 2015 09:23:27 +0100
schrieb Attila Kinali :
> On Tue, 17 Mar 2015 22:04:49 +0100
> Florian Teply wrote:
>
> > funnily I stumbled across that very question just a few weeks ago
> > while doing my very first ring oscillator designs myself.
>
> Good, I a
Hi,
funnily I stumbled across that very question just a few weeks ago while
doing my very first ring oscillator designs myself.
The explanation I have come to is essentially the following: In
principle, you're right, a ring oscillator CAN oscillate at a number of
frequencies. Given the way the ri
Am Fri, 21 Feb 2014 11:42:05 -0800 (PST)
schrieb Bob Albert :
> Oops yes I goofed, it's 500 MHz. 500 GHz is beyond state of the art
> I would think.
>
Depends on your circuit development skills. Bipolars with gain at
500GHz are in principle possible, both in III/V-semiconductors (InP
comes to min
that the computing shouldn't be
an issue for anything nowadays.
> Why bother with a hardware solution when software can
> do it more easily?
>
Nuts answer: because we can?
Florian
> -Chuck Harris
>
> Florian Teply wrote:
> > Well, if someone comes up with a circuit,
Am Wed, 19 Feb 2014 22:45:56 -0800
schrieb "Richard (Rick) Karlquist" :
>
>
> On 2/19/2014 9:10 PM, John Marvin wrote:
> > I guess my question is who has the right to grant "exclusive
> > rights" for the ability to decode a very simple protocol? Was a
> > patent actually granted for this?
> >
>
Am Mon, 26 Aug 2013 07:56:51 -0400
schrieb Bob Camp :
> Hi
>
>
> On Aug 26, 2013, at 2:01 AM, Magnus Danielson
> wrote:
>
> > On 08/25/2013 08:25 PM, Bob Camp wrote:
> >> Hi
> >>
> >> The most common approach is to *assume* that the two devices are
> >> not correlated. SInce it's a negative,
Hello,
Am Sat, 8 Sep 2012 21:56:45 +0200 (CEST)
schrieb Marek Peca :
> > Well, for the CMOS stuff 100ps should do just fine. Of course, less
> > is better, but there's only so much one can reasonably do for so
> > many channels... Even a PICTIC should be able to do better than 500
> > ps for a sin
Am Sun, 09 Sep 2012 02:40:23 +0200
schrieb Magnus Danielson :
> Hi Florian,
>
> On 09/08/2012 07:34 PM, Florian Teply wrote:
> > The idea I have right now is employing something on the order of
> > three to five comparators per output, fed with different trigger
> > l
Hello,
Am Sat, 8 Sep 2012 19:41:28 +0200 (CEST)
schrieb Marek Peca :
> > (..) But then I'll have to throw a few hundred Time Interval
> > Counters at the problem in order to get the information on the
> > duration of the transients. So in general, amplitude information
> > comes from the compar
Hi fellow time nuts,
quite soon I'll have to come up with a clever idea to characterize a
few chips of a 130nm BiCMOS technology for transients. Unfortunately,
I'll have to look at something on the order of five dozen outputs per
chip, all at the same time.
If money and development time was no co
Am Thu, 15 Mar 2012 22:08:12 +0100
schrieb Azelio Boriani :
> Yes, there is people who have what in the past was expensive test
> equipment and now can be bought by 1/10 of the original price. The
> problem is that you need someone who can record 2 seconds of a signal
> that is slightly beyond the
On Saturday 05 June 2010 23:55:15 John Miles wrote:
> Many thanks - I ended up with a couple of copies. :)
>
That's why i announced it on-list as well ;-)
Regards,
Florian
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On Saturday 05 June 2010 11:29:03 John Miles wrote:
> I'm interested in tracking down a copy of Walls's "Cross-Correlation Phase
> Noise Measurements" from the 1992 IEEE Frequency Control Symposium
> proceedings, but apparently the IEEE's no longer offering their traditional
> $10 a la carte downlo
Am Saturday 21 November 2009 20:32:11 schrieb J. Forster:
> OK. Sme GPS receivers have magnetic sensors. What do they do with/about
> magnetic deviation.
>
Just a wild guess: The GPS receiver also knows its location, and magnetic
deviation is known to some degree in its variation over earth's sur
Am Saturday 21 November 2009 15:05:12 schrieb iov...@inwind.it:
> Does a stationary (not in motion) GPS receiver know where the North is?
>
> As far
> as I can understand, it doesn't, isn't it?
>
Umm, as far as i understand it, a single receiver with a single
omnidirectional antenna (at least with
Am Wednesday 21 October 2009 01:16:55 schrieb Alan Melia:
> Marco, have you considered that HBG on 75.0kHz might be stronger with you
> from Switzerland??. In a lab or other complex quite often with off-air
> standards the problem is local noise. I have a friend in Porto who used to
> be able to lo
Am Tuesday 20 October 2009 21:01:06 schrieb Corby Dawson:
> Hi,
>
> I am working on a project to plate the lamp reflector in an HP 5065A with
> gold. The existing reflector is aluminum. What little I can find suggests
> that in addition to some preliminary plating the layer just below the
> gold sh
Am Sunday 11 October 2009 16:57:50 schrieb Arnold Tibus:
> On Sun, 11 Oct 2009 16:27:32 +0200, Arnold Tibus wrote:
> >
> >When used these numbers in calculations we anyway have to convert
> >these ppm, ppb, ppt etc. to scientific numbers using exponents
> >There are too often discussions and misund
Am Sunday 04 October 2009 12:43:16 schrieb Rex:
> Kevin,
>
> That is a very informative description.
>
> I've not lived in a lightning-probable area with antennas. Here
> lightining is a remote possibility, but I'm trying to digest what you
> have told us.
>
> You said, "For example, if you have eq
Am Sunday 04 October 2009 10:57:22 schrieb kevin-use...@horizon.com:
> Consider a lightning strike to be the closest thing to an ideal current
> source you are going to encounter. You *cannot* stop it with series
> impedance alone, no matter how high; you have to provide it with a very low
> shunt
Am Saturday 26 September 2009 14:44:52 schrieb Robert Vassar:
>
> Nothing will save you from a direct strike. At least nothing you can
> likely afford. You're more likely to get clobbered by a surge from
> the grid, or induced voltage from a nearby strike.
>
> Use the "box method". Draw a diagra
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