Re: [time-nuts] Looking for IEEE-488 codes and formats for Datum 9700AT Programmable Time System

2018-04-09 Thread Forrest Christian (List Account)
Just curious, is there by chance a removable eprom or other programmable device on these boards? Assuming a fairly verbose scpi like command interface, I've occasionally had luck reverse engineering a command set by looking through an eprom dump for a list of commands? Also, does this by chance

Re: [time-nuts] Frequency deviations in Europe affect clocks

2018-03-08 Thread Forrest Christian (List Account)
When there is more demand than generation, the frequency of the grid drops. My understanding is that one particular country is pulling more from the grid than they are generating, and for political/and or financial reasons which are a bit unclear, noone is willing to generate enough power to

Re: [time-nuts] Microsemi up for sale?

2018-03-03 Thread Forrest Christian (List Account)
There is an announcement of the impending purchase on the Microchip website. >From my perspective this is a good thing as I've been eyeing some of the microsemi semiconductor products for some time for use in various designs of mine and this is likely to make those products easier to incorporate

Re: [time-nuts] Slightly OT: interest in a four-output, ultra-low jitter, synthesizer block?

2018-01-25 Thread Forrest Christian (List Account)
So, I happen to have a full low-volume SMD assembly line here... for our own products (although I did have similar thoughts to John about spinning a couple of carrier boards for these type of parts but designed so they are suitable for assembly on our line). Our take on QFN's is that they're not

[time-nuts] Trimble thunderbolt accuracy expectations

2017-12-03 Thread Forrest Christian (List Account)
A couple of weeks back I caught my thunderbolt way out of lock, and doing some sort of weird sawtooth oscillation in the DAC and PPS reading causing the PPS alignment to swing +-50ns or so away from correct alignment (based on some +-10ns GPS receivers I have here).After lots of attempts at

Re: [time-nuts] HP5065 - Some OP-Amp, FB and Teflon ...

2017-11-28 Thread Forrest Christian (List Account)
I am *not* an expert on the HP5065... In fact, I just joined so I could learn a bit more about precision timekeeping... have various reasons for wanting a precision clock on the bench, and trying to figure things out. So, the following is based on past experience with similar replacements, in