Re: [time-nuts] Answer found: HP53132A anomaly

2020-06-03 Thread Richard (Rick) Karlquist
I worked in the R&D section that designed the HP53132 series at the time it was designed. This kind of stuff would be SOP where the gate array designer (great engineer, I knew him well) does a proper job, and then after the fact marketing/manufacturing adds on the rear connect because some big c

Re: [time-nuts] Alltest used test equipment and parts

2020-06-03 Thread Mark Kahrs
for zl3ag: http://www.tech-systems.net/ Not my favorite people by a long shot. But sometimes they have what you need/want/desire. On Wed, May 27, 2020 at 9:08 AM Bob kb8tq wrote: > Hi > > I bought a Fluke 732A from them back about 2 months ago. Not exactly cheap > and > maybe more on topic f

[time-nuts] Answer found: HP53132A anomaly

2020-06-03 Thread Taka Kamiya via time-nuts
I hope this will be helpful to someone.  I recently had to take one to calibration and testing. I have two HP53132A counters.  Recently I've noticed funny behavior when I tried to run self-diagnostic on Front End.  One counter always succeeds, but another one always fails.  The second counter s

[time-nuts] Stanford University online GPS course

2020-06-03 Thread Peter Vince
I've just been told about an online undergraduate course on the GPS system done by Stanford University. I don't remember reading about it on here, and a quick check of the archives drew a blank. The course is completely free, and on YouTube at: https://www.youtube.com/watch?v=o1Fyn_h6LKU&list=P

Re: [time-nuts] Trigger circuit for TIC

2020-06-03 Thread Bob kb8tq
Hi (wandering a long way away from the original post …..) When you design a DMTD that runs into a counter, by far the biggest part of the DMTD design is the limiter(s) that turn the mixer output into a “useable” square wave. Even high end commercial counters are unable to process the output of a

Re: [time-nuts] Trigger circuit for TIC

2020-06-03 Thread Bruce Griffiths
There is no universal circuit that minimises jitter for all signals without some tuning to suit the input frequency and threshold crossing slew rate. The LTC6957 works well for higher frequency sine waves. The low frequency sine wave outputs of a DMTD require a set of cascaded lowpass filtered l

[time-nuts] Trigger circuit for TIC

2020-06-03 Thread Tobias Pluess
Dear colleagues I am currently thinking about a concept for my own TIC. While I gathered some knowledge during my GPSDO project about using the TDC7200 as interpolator, I have not yet a good idea how I should design the input stage of a TIC. It should be somewhat universal, i.e. it should be usable