Re: [time-nuts] Power connectors continued

These expensive and exotic connectors are nice but are over kill for most projects which live their entire lives on a lab bench and never fly to Mars or even Low Earth Orbit. I found out about "GX" style connectors a while back. They are multi-pin circular connectors with screw down locking

Re: [time-nuts] Power Connectors and D-Subs...

> > I’m not claiming Lemo’s are any cheaper or easier to get than the uber > D’s. At least they > give a bit better density. we are in violent agreement. On Mon, Jun 26, 2017 at 7:06 PM, Bob kb8tq wrote: > Hi > > I’m not claiming Lemo’s are any cheaper or easier to get than

Re: [time-nuts] Power Connectors and D-Subs...

Hi I’m not claiming Lemo’s are any cheaper or easier to get than the uber D’s. At least they give a bit better density. Bob > On Jun 26, 2017, at 9:19 PM, Christopher Hoover wrote: > > On Sun, Jun 25, 2017 at 2:53 PM, Bob kb8tq wrote: > >> Hi >> >> Cost

Re: [time-nuts] Power connectors continued

> > They will definitely not work loose. ODU or Glennair (I forget which) has a ratcheting lock ring on some of their connectors. It has asymmetric ramps on the ratchet cam that tighten the lock ring under vibration. -ch 73 de AI6KG On Fri, Jun 23, 2017 at 9:01 PM, Charles Steinmetz

Re: [time-nuts] Power Connectors and D-Subs...

On Sun, Jun 25, 2017 at 2:53 PM, Bob kb8tq wrote: > Hi > > Cost a fortune *and* can easily get you into 12 week delivery times …. > oh lord. tell me about it. we need to put lemo's in the same bucket -- expensive and long lead times. (they are so expensive there are

Re: [time-nuts] Yet Another GPSDO design - Timing on the move

Thanks! for the nice reply. I did as you suggested and got a copy! Don On 2017-06-26 15:43, Jan-Derk Bakker wrote: On Mon, Jun 26, 2017 at 10:43 PM, djl wrote: I'd really like to have a look at the schematic, but trying to read it leads to some app requiring me to bare my

Re: [time-nuts] Yet Another GPSDO design - Timing on the move

On Mon, Jun 26, 2017 at 7:43 PM, Tom Van Baak wrote: > Thanks for sharing this project with us, and including the schematic. > Thanks! In the past week we've built ten of these, and I've gotten started on the software. The EFC inner control loop works (using a 24-bit ADC to

Re: [time-nuts] Yet Another GPSDO design - Timing on the move

On Mon, Jun 26, 2017 at 10:43 PM, djl wrote: > I'd really like to have a look at the schematic, but trying to read it > leads to some app requiring me to bare my machine's soul to an unknown app > developer. Could plain .pdf be put somewhere not involving Google? > Save As...

Re: [time-nuts] GPScon running on Raspberry Pi 3b

andrew.mile...@gmail.com said: > Beware that USB-to-Serial converters are pretty horrible for precise timing > applications, like PPS on the CD pin. It can be done on a GPIO pin instead, > but requires some hacking and re-compiling. What sort of hacking or re-compiling do you have in mind? I

Re: [time-nuts] Yet Another GPSDO design - Timing on the move

On Mon, 26 Jun 2017 10:43:24 -0700 "Tom Van Baak" wrote: > > down. U21 is a 128KB SRAM chip for scratch space, U13 is a FeRAM chip to > > store EFC settings (as EEPROM would wear out too fast with regular writes, > > and I cannot guarantee having enough energy after

Re: [time-nuts] Yet Another GPSDO design - Timing on the move

Not always, by any means. Stochastic error (in simplest terms, the difference between expected and actual) may be random or systematic. Systematic error, which may be reflected in outliers and in other ways, is at least potentially findable and fixable. Unhappily, random error will always be

Re: [time-nuts] GPScon running on Raspberry Pi 3b

On Mon, Jun 26, 2017 at 2:04 PM, Andrew E Mileski wrote: > > The RaspberryPi 3 is a bit different. > > All the Pi models, 1 & 2 & 3, have two UARTs: a full-featured UART, and a > mini-UART. > > On the PI 3, the header pins for the serial port are routed by default to >

Re: [time-nuts] Yet Another GPSDO design - Timing on the move

d'oh never mind don On 2017-06-26 14:43, djl wrote: I'd really like to have a look at the schematic, but trying to read it leads to some app requiring me to bare my machine's soul to an unknown app developer. Could plain .pdf be put somewhere not involving Google? Thanks don On 2017-06-26

Re: [time-nuts] Yet Another GPSDO design - Timing on the move

Hi It’s mainly a matter of causality. If you have an anomalous reading, there is likely a “findable” reason for it. Finding that reason probably gives you useful information about the design and how to improve it. Bob > On Jun 26, 2017, at 4:17 PM, William H. Fite wrote:

Re: [time-nuts] Yet Another GPSDO design - Timing on the move

I'd really like to have a look at the schematic, but trying to read it leads to some app requiring me to bare my machine's soul to an unknown app developer. Could plain .pdf be put somewhere not involving Google? Thanks don On 2017-06-26 14:17, William H. Fite wrote: On Monday, June 26,

Re: [time-nuts] Yet Another GPSDO design - Timing on the move

On Monday, June 26, 2017, Tom Van Baak wrote: > > Be careful about that. Act like there are no outliers: every point is > trying to tell you something. ARG! Your resident statistician just had a sudden, stabbing pain in the head. Before an audience of

Re: [time-nuts] GPScon running on Raspberry Pi 3b

On Sun, Jun 25, 2017 at 3:04 PM, Mark Sims wrote: > Heather's configuration priority is to process: hard coded defaults, > then the config file, and finally the command line options. This lets you > set your preferred settings in the config file and then override your >

Re: [time-nuts] GPScon running on Raspberry Pi 3b

On Fri, Jun 23, 2017 at 12:16 AM, Hal Murray wrote: > > hol...@hotmail.com said: > > The PI does have a couple of logic level serial ports on the expansion > > connector you can connect a level shifter two. One port is normally the > > Linux serial console which you can

Re: [time-nuts] Yet Another GPSDO design - Timing on the move

Jan-Derk, Thanks for sharing this project with us, and including the schematic. Some comments: > the file type wrong; Acrobat opens the file just fine). Its first use will > be in the telemetry system of my students' solar-powered boat ( > http://cleanmobility.info/voertuigen/solar-2015/ ), on

Re: [time-nuts] GPScon running on Raspberry Pi 3b

Mark, That is exactly the right processing order. However, it shouldn't actually try the USB port until after that processing is done. In other words, if the configuration file has -1u and the command line has -4u, it should never try USB0 because that was overridden on the command line. It

Re: [time-nuts] Latest Lady Heather

Any chance of this getting hosted in say Giithub? If people arguing to to contribute changes having each contributor hold his own changes is not what that call "best practice". If you make it easy enough by using git, you will see more contributions by users. On Sun, Jun 25, 2017 at 1:43

[time-nuts] GPScon running on Raspberry Pi 3b

Heather's configuration priority is to process: hard coded defaults, then the config file, and finally the command line options. This lets you set your preferred settings in the config file and then override your config file options from the command line. > When I