[time-nuts] Checking the Frequency of a Rubidium Oscillator

Thanks to all that explained the hopelessness of measuring GPS satellite transmission frequencies directly with a simple counter. I should have known better, but probably have been retired too long. Bruce, KG6OJI **Get movies delivered to your mailbox. One month free from

[time-nuts] Fine delay generator

Dear nuts, I am designing a card that should be able to delay a trigger from 25ns up to several seconds in 10ps steps. The card will use an external 10MHz as frequency reference. I have thought of two architectures. One is a counter clocked by a keyed oscillator followed by a fine delay and the

Re: [time-nuts] Fine delay generator

pablo alvarez wrote: Dear nuts, I am designing a card that should be able to delay a trigger from 25ns up to several seconds in 10ps steps. The card will use an external 10MHz as frequency reference. I have thought of two architectures. One is a counter clocked by a keyed oscillator

[time-nuts] TBolt disciplined receivers...

Will TAPR be getting anymore of these units, if anyone knows? I'm always a day late and a couple a' dollars short. Bill Mason W5TP ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] What's all this about violins in the streets?

My apologies, but I didn't think you'd want to hear about jumps. My good friend, and software genius, was late for a lunch appointment today. The atomic alarm clock that he has used for years was 3.3 hours behind this morning, but not on any other morning. My WWVB clock was dead on at 4 PM (in

Re: [time-nuts] Fine delay generator

pablo alvarez wrote: Dear nuts, I am designing a card that should be able to delay a trigger from 25ns up to several seconds in 10ps steps. The card will use an external 10MHz as frequency reference. As an analogue option I was thinking of latching the input trigger with a flip-flop, low

Re: [time-nuts] What's all this about violins in the streets?

I figure there is no CRC check for the WWV clocks. I had on lose it for about 3 days in the middle of summer, and then it picked it back up and has been OK since. Maybe local RFI when the clock went to check the signal Brian KD4FM Bill Hawkins wrote: My apologies, but I didn't think

Re: [time-nuts] What's all this about violins in the streets?

Hi Brian: The WWVB clocks typically want to see 2 or 3 minutes go by where the data packets have date and time incrementing by 1 minute. If you see that then you have valid data. Hard for interference to mess it up. But a low battery will cause problems, i.e. the clock may miss steps and get

Re: [time-nuts] Fine delay generator

Pablo Surely it would be better to sampled the low pass filtered latched trigger transition with a pipeline ADC clocked at 100MHz or more. The threshold crossing time of the ADC input can then be calculated from the ADC samples (using WSK interpolation etc) provided there are sufficient

Re: [time-nuts] What's all this about violins in the streets?

Yes, mine have shown similar errors from time to time. Usually a new battery fixes the problem. I have had it happen on AC powered clocks. The usually go back to proper time after I press the WAVE button. I figure they must get some interference from something that causes them to go

[time-nuts] More HP 5062C cesium beam debugging questions

Greetings everyone; I am back on the task of try to figure out what is wrong with my 5062C. Many thanks to Corby for the power supply scans and debugging tips so far. The 18v power supply card seems fine, it is not being enabled by the ion pump power supply. As far as I can tell, the ion