[time-nuts] 5 MHz Frequency Doubler

Hey 'nuts, I'm looking for a good design for a 5 MHz frequency doubler. The Wenzel Blue Tops HF doubler is said to be based on a low phase noise, public-domain NIST design: http://www.bluetops.com/Modules/lnhd.htm The LNHD is a fixed-frequency

Re: [time-nuts] Allan deviation -> finally some data!!!

> Well, the idea was precisely to adjust the loop parameters in software > on the PC, which would probably be easier than in hardware, with the > time constants involved, then once those are established, implement them > in a uC or in analog hardware. Is this a project to prototype and build a

Re: [time-nuts] Allan deviation -> finally some data!!!

Tom Van Baak wrote: >> Since I have only one readily accessible spare OCXO at the moment and I >> want to get the procedure right before I take anything else apart, I >> will feed the output of the 10 MHz reference from the 5370 into the >> START channel, and my DUT into the STOP channel and sel

Re: [time-nuts] Comparison of Logic Standards for Clock Distribution

Stephan Sandenbergh wrote: > Hi Bruce, > > Thank you for the elaborate answer covering different logic types. Funny > enough, I have just read the excellent book you recommended cover to cover - > probably the origin of many of my questions. > > > I have never really touched the topic of optical fi

Re: [time-nuts] Comparison of Logic Standards for Clock Distribution

Stephan Sandenbergh wrote: > Hi Bruce, > > > > You mentioned that locking to a crystal at the receiving end as an option. > Does this mean that signal transmission is primarily plagued by short term > noise? > > I have never really touched the topic of optical fibre, but I realise that > it is sup

Re: [time-nuts] HP5370A A22 arming assembly circuit diagram error

Dr Bruce Griffiths wrote: > John Miles wrote: >> In the 5370B manual (2940A prefix), it looks like they are running U7 >> from >> +5 on pin 3 and -5.2 on pin 12. Probably a drafting error in the -A >> manual. >> >> -- john, KE5FX >> >> >> >>> Dr Bruce Griffiths wrote: >>> Correction t

Re: [time-nuts] Allan deviation -> finally some data!!!

> Since I have only one readily accessible spare OCXO at the moment and I > want to get the procedure right before I take anything else apart, I > will feed the output of the 10 MHz reference from the 5370 into the > START channel, and my DUT into the STOP channel and select SEP instead > of ST

Re: [time-nuts] Comparison of Logic Standards for Clock Distribution

Ulrich Bangert wrote: > Hi Folks, > > >> You mentioned that locking to a crystal at the receiving end >> as an option. Does this mean that signal transmission is >> primarily plagued by short term noise? >> > > While it is not exactly locking a crystal to a input frequency HP has > used

Re: [time-nuts] HP5370A A22 arming assembly circuit diagram error

John Miles wrote: > In the 5370B manual (2940A prefix), it looks like they are running U7 from > +5 on pin 3 and -5.2 on pin 12. Probably a drafting error in the -A manual. > > -- john, KE5FX > > > >> Dr Bruce Griffiths wrote: >> >>> Correction to previous post. (typed U7 instead of U6 VVC

Re: [time-nuts] Allan deviation -> finally some data!!!

Bruce, Sorry that I did not specify the setup was the same as when described in the post about the trigger outputs, as follows: > I have a single 10 MHz sine signal fed to the START channel, and > the 5370 is set to TI, MEAN, SAMPLE SIZE 1, + TI ONLY, START channel > triggers o

Re: [time-nuts] HP5370A A22 arming assembly circuit diagram error

In the 5370B manual (2940A prefix), it looks like they are running U7 from +5 on pin 3 and -5.2 on pin 12. Probably a drafting error in the -A manual. -- john, KE5FX > Dr Bruce Griffiths wrote: > > Correction to previous post. (typed U7 instead of U6 VVC connected too > > ground OK for U7 as in

Re: [time-nuts] Allan deviation -> finally some data!!!

Ulrich Bangert wrote: > Hi Didier, > > the sigma-tau plot looks indeed strange! Can you send me the data file > for some tests with it? > > 73 de Ulrich, DF6JB > The files are at http://www.ko4bb.com/Test_Equipment/ filenames: Counter_TIxx.dat Didier ___

Re: [time-nuts] HP5370A A22 arming assembly circuit diagram error

Dr Bruce Griffiths wrote: > Correction to previous post. (typed U7 instead of U6 VVC connected too > ground OK for U7 as inputs are ECL levels. ) > > The positive supply connection to A22:U7 (LM339 quad comparator) is > shown as ground in the circuit diagram. > This is surely incorrect as the inp

[time-nuts] HP5370A A22 arming assembly circuit diagram error

Fix for yet another typo, I really should check the text more carefully. The positive supply connection to A22:U6 (LM339 quad comparator) is shown as ground in the circuit diagram. This is surely incorrect as the inputs of U6B and U6C are connected to TTL(+5V VCC) signals. Surely this is not th

[time-nuts] HP5370A A22 arming assembly circuit diagram error

Correction to previous post. (typed U7 instead of U6 VVC connected too ground OK for U7 as inputs are ECL levels. ) The positive supply connection to A22:U7 (LM339 quad comparator) is shown as ground in the circuit diagram. This is surely incorrect as the inputs of U6B and U6C are connected to

[time-nuts] HP 5370A A22 arming assembly circuit diagram error

The positive supply connection to A22:U7 (LM339 quad comparator) is shown as ground in the circuit diagram. This is surely incorrect as the inputs of U6B and U6C are connected to TTL(+5V VCC) signals. Surely this is not the designers intention The positive supply of A22:U7 should be +5V. Is the

Re: [time-nuts] Allan deviation -> finally some data!!!

Didier It would be useful if you describe in some detail your measurement setup. Which signals are connected to which inputs on the 5370A? How long are the cables? etc., Also given your source selection problems with the 5370A it may be instructive to run a simple test. Connect a low frequency

Re: [time-nuts] Allan deviation -> finally some data!!!

Hi Didier, the sigma-tau plot looks indeed strange! Can you send me the data file for some tests with it? 73 de Ulrich, DF6JB > -Ursprüngliche Nachricht- > Von: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Im Auftrag von Didier Juges > Gesendet: Mittwoch, 25. Oktober 2006 15:36 > An: D

Re: [time-nuts] Comparison of Logic Standards for Clock Distribution

In message <[EMAIL PROTECTED]>, Dr Bruce Griffiths writes: >One can glean some idea of how this may best be done by looking at how >NIST, USNO, NIST, PTB, etc pipe the standard frequencies from their >various atomic standards around. Current designs for modern radio >telescope arrays such as th

Re: [time-nuts] Comparison of Logic Standards for Clock Distribution

Stephan Sandenbergh wrote: > Hi Bruce, > > Thank you for the elaborate answer covering different logic types. Funny > enough, I have just read the excellent book you recommended cover to cover - > probably the origin of many of my questions. > > As I said in reaction to Said's response - I am not s

Re: [time-nuts] Allan deviation -> finally some data!!!

Dr Bruce Griffiths <[EMAIL PROTECTED]> wrote: > > > The apparent behaviour of your 10811's is far too good!! > Over a period of 15,000 seconds the allan deviation should have reached > a minimum and then increased as the effects of ageing manifest themselves. > Either the oscillators are

Re: [time-nuts] Allan deviation -> finally some data!!!

Didier Juges wrote: > I have downloaded and installed Plotter, and found it easy to setup and use, > at least for basic functionality. The menu threw me off a little bit (no > simple File->Open dialog), but I am sure I will get used to it. > > I have ran my spare HP10811 overnight (twice), agains

[time-nuts] Allan deviation -> finally some data!!!

I have downloaded and installed Plotter, and found it easy to setup and use, at least for basic functionality. The menu threw me off a little bit (no simple File->Open dialog), but I am sure I will get used to it. I have ran my spare HP10811 overnight (twice), against the HP5370A's own timebase

Re: [time-nuts] Comparison of Logic Standards for Clock Distribution

Hi Bruce, Thank you for the elaborate answer covering different logic types. Funny enough, I have just read the excellent book you recommended cover to cover - probably the origin of many of my questions. As I said in reaction to Said's response - I am not surprised that analog (sine wave) transm

Re: [time-nuts] Comparison of Logic Standards for Clock Distribution

Hi Said, Thank you for the answer and also for the attached measurements. The measurements I find particularly interesting and note worthy. It seems that digital signals provide high noise immunity in the sense that one relies only on one dimension to convey information: the cross-over point. Th