Re: [time-nuts] Simple open source microcontroller solution to tune DDS needed

I have those 9954/9854 boards and the problem is the drivers for newer operating systems past XP aren’t available. The AD9854/9954 boards were clones of the AD eval kits and you downloaded the eval kit software from AD. I got the board(s) working with Windows 7 but it took a lot of screwing

Re: [time-nuts] Simple open source microcontroller solution to tune DDS needed

The problem with the 9854 DDS is that the analog reconstruction filters that you have to place after its outputs, are not guaranteed to have *exactly* the same phase behavior  between the two sections (I and Q). This may or may not be important, depending on the application. For sure, for an

Re: [time-nuts] Simple open source microcontroller solution to tune DDS needed

Bascom is a Basic compiler, for AVR chips if my memory serves right. > On Dec 13, 2017, at 12:10 PM, Adrian Godwin wrote: > > Maybe this one ? > > http://www.qsl.net/pa3ckr/bascom%20and%20avr/ad9951/index.html

Re: [time-nuts] European Electronics Systems Radio Clock Model 100

Nigel The link to Siemens came from Companies House searches on the name. They reference the link to Siemens and mention Christchurch as a base (however that could just have been a registered office for accounting purposes and not the engineering / production location). I have several model 100

Re: [time-nuts] accurate 60 hz reference chips/ckts

National Semi used to make a chip (MM5369) that was designed specifically for that task, but it's long out of production. I don't know of any off-the -shelf 60Hz generators, but it's pretty easy to build one. Here are a couple of web pages that will generate a 60Hz crystal controlled signal.

Re: [time-nuts] Simple open source microcontroller solution to tune DDS needed

Seconded on the Andy Talbot suggestion, iirc he has almost exactly what you need On 14 Dec 2017 17:19, "Dave B via time-nuts" wrote: > Take a look at Andy Talbot's page at... > > http://www.g4jnt.com/Synthesizers.htm > > Lots of good options there for that sort of thing. > >

[time-nuts] accurate 60 hz reference chips/ckts

PIcked up a couple of large size Radio Shack 63-960 LED clocks with Settable alarm, at local Goodwill store. $3.00 ea work great see across room, loud Alarm, etc... Barely missed, by seconds, getting a classic Hallicrafters General coverage receiver (not like say, S-38) but a larger light

Re: [time-nuts] Simple open source microcontroller solution to tune DDS needed

Take a look at Andy Talbot's page at... http://www.g4jnt.com/Synthesizers.htm Lots of good options there for that sort of thing. 73. Dave G0WBX. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] accurate 60 hz reference chips/ckts

Pat, > They drift a few seconds in the course of a few days, and wander back and > forth. Yes, it's normal for AC mains to drift around by a few seconds over a day but it usually stays roughly on-time over weeks and months. Here's an old example of monitoring mains time & frequency for 45

Re: [time-nuts] accurate 60 hz reference chips/ckts

apollo...@gmail.com said: > Want to provide an accurate (relatively accurate) 60 hz reference to the > chip. Some room inside for custom modifications. Does a TCXO or similar > exist in a small package that provides 60 hz ticks? I doubt if you will find a TCXO that puts out 60 Hz. But it's

Re: [time-nuts] accurate 60 hz reference chips/ckts

Since the power line has the desired long term stability but is poor on the short term, I wonder if a solution might be to use it as the reference for a "power line disciplined oscillator." You would want a filter time constant of several hours in the control loop to smooth out the variations in

Re: [time-nuts] Oscilloquartz 8600-3 Disassembly pictures...

Well, I had a cable jump out of a switch yesterday, which took 10 s to fix when home. Ah well. A more robust setup is in the making. Cheers, Magnus On 12/14/2017 08:02 AM, Ulf Kylenfall via time-nuts wrote: Tried to mail the pictures to Magnus. The mail bounced back. Ole Petter Ronningen

Re: [time-nuts] accurate 60 hz reference chips/ckts

I dont think working that way would give a stable clock in the UK. Our frequency can vary more than the US but the number of cycles between 0800 on one day and the next is mandated to be correct (I presume +/- 25 :-)) ). So you would be chasing a moving target, and at no time of the day need

Re: [time-nuts] accurate 60 hz reference chips/ckts

That’s not a problem, that means you’re phase locked instead of just frequency locked. This is the phase-nuts mailing list, right? :-) Tim N3QE > On Dec 14, 2017, at 6:19 PM, Alan Melia wrote: > > I dont think working that way would give a stable clock in the UK.

Re: [time-nuts] accurate 60 hz reference chips/ckts

On Thu, December 14, 2017 8:39 pm, Tom Van Baak wrote: > One can determine the appropriate time constant by looking at the ADEV of > the two clocks It appears that the appropriate design would use a local oscillator which is stable to better than 10^-7 at 5 years and approximately 1200 days time

Re: [time-nuts] accurate 60 hz reference chips/ckts

Hi My guess is that the “best design” would likely do a sample at some specific time of day. Just when would depend a bit on your local grid and how it is fed and loaded. There are definitely “it’s 6 PM and everybody just got home” issues with power line phase. Next question wold be how long

Re: [time-nuts] Fluke/Pendulum PM6680/CNT-80 measurement instability/outliers

I have a few questions about your setup: (1) What is the waveform shape you are measuring? Are you measuring a square wave (or some other duty cycle waveform with fast rise and falling edges)? Or is it a sinewave with low harmonic content? (2) How is the counter voltage threshold set with respect

Re: [time-nuts] accurate 60 hz reference chips/ckts

t...@leapsecond.com said: > For GPS and OCXO the choice of time constant is fairly obvious. But the > ADEV for mains frequency isn't quite as pretty. So I'm not sure several > hours would work; maybe more like days or weeks? Here's a sample ADEV for > power line frequency: Has anybody

Re: [time-nuts] accurate 60 hz reference chips/ckts

On Thu, Dec 14, 2017 at 10:53 PM, Bob kb8tq wrote: > > > Of course this *assumes* an electronic approach. Given that it’s moving > pretty slow and you > only are looking at fractions of a millisecond, one *could* do an electro > mechanical design …... > > Bob > > There is

Re: [time-nuts] Test WWV timecube against Cesium, Rubidium, MASER or other precision time (UT-1) metrology

Here is a project which mixed the Time Kube IF output back to 10 MHz for use as a frequency (not time) standard:http://schematicsforfree.com/archive/file/Oscillators%20and%20Generators/Misc/10Mhz%20Frequency%20Standard%20Using%20Wwv.pdf I believe that the Time Kube uses a 3-transistor mixer / 455

Re: [time-nuts] Simple open source microcontroller solution to tune DDS needed

Rick Please contact me off list we did a board for Corby to be used with the HP Rb using a PIC but I would have to better understand your needs to figure out what board to use. Bert Kehren   In a message dated 12/13/2017 4:06:01 PM Eastern Standard Time, artgod...@gmail.com writes:   It's a