Re: [time-nuts] Fwd: HP 53131A Power Off Mod

updated accordingly. Sorry for the mistake and I hope this hasn't inconvenienced anyone. *Wayne* On Fri, May 18, 2018 at 4:56 PM, Wayne Holder wrote: > The PCBs and Parts arrived and, after putting everything together and > testing it, it all seems to work fine. And, to document every

Re: [time-nuts] Fwd: HP 53131A Power Off Mod

and 181 in need of these :) > > Can you share the gerbers for your PCBs and then I can cut them out on my > mill. > > I could probably make a few for any interested Australians, to save on > cross pond postage. > > thanks > > Tim > > On 8/05/2018 9:08 AM, Wayne Holder

Re: [time-nuts] Anybody have suggestions for time related science fair projects?

Using a pendulum to measure gravity requires precision timekeeping. Wikipedia has a nice discussion of this at https://en.wikipedia.org/wiki/Pendulum#Gravity_measurement There are number of very clever techniques developed long ago, such as Henry Kater's design for a reversible, dual pivot pendulu

Re: [time-nuts] Fwd: HP 53131A Power Off Mod

nice simple mod ! > > I have both a 53131 and 181 in need of these :) > > Can you share the gerbers for your PCBs and then I can cut them out on my > mill. > > I could probably make a few for any interested Australians, to save on > cross pond postage. > > thanks > &

Re: [time-nuts] TCVCXO Adjustment

> The application is time stamping separate free running devices, in this > case different video and audio recorders. So the absolute time is > arbitrary, but all the devices in use have to agree on the rate of time > progression for as long as they are being used together. > The typical requireme

Re: [time-nuts] TCVCXO Adjustment

Again, thanks for all the great feedback and suggestions. > Are you familiar with these devices which I just found this week? > https://tentaclesync.com/products Yes, that's one of the lower cost commercial units available. Another is the NanoLockiIt by Ambient

Re: [time-nuts] TCVCXO Adjustment

First, thanks for all the comments and suggestions, It's given me a lot to think about and research. Based on the feedback I've received, I've started to investigate using the NTP server approach suggested by Chris Caudle. I also found this NIST Paper

[time-nuts] TCVCXO Adjustment

I'm designing a small, portable, SMPTE LTC Timecode Generator as an open source/hardware project for amateur filmmakers and videographers. LTC Timecode is typically recorded on the audio tracks of cameras and sound recorders so the video and sound com

Re: [time-nuts] Replacement A9 boards for the HP 5065A

>> The only thing I could provok, was that almost all capacitors I >> tried were sensitive to touch. Most ceramic caps are sensitive to "micro phonics" via the piezoelectric effect, which can translate mechanical stress into electrical noise. https://e2e.ti.com/blogs_/archives/b/precisionhub/arc

Re: [time-nuts] NEO-7M various modes

uBlox has a utility called u-center that's a free download. You can use it to configure the various output options (and enable and disable different messages) and a then save this config back to the module as the start up default. Wayne On Sat

Re: [time-nuts] LPRO-101 BITE (~lock) Signal Always Low

the VCXO nearing tune limit. > If the unit locks up and > >> seems to work, I’d ignore it and move on. > >> > >> Bob > >> > >>> On Mar 21, 2016, at 9:42 PM, Wayne Holder > wrote: > >>> > >>> I have a surplus LPRO-101 that seems t

Re: [time-nuts] LPRO-101 BITE (~lock) Signal Always Low

>> > >> Hi > >> > >> There are probably a dozen or more things that contribute to the BITE > output. It could be > >> a regulator out of range. It also could be the VCXO nearing tune limit. > If > the unit locks up and > >> seems to work, I’d i

[time-nuts] LPRO-101 BITE (~lock) Signal Always Low

I have a surplus LPRO-101 that seems to power up OK. The power draw starts at 1.7 Amps and then, after a few minutes, drops down to 600 mA, or so and, after this startup, the output shows a 10.000 MHz signal thats 's accurately as I can measure it. The lamp voltage is 6.2 volts, which seems withi

Re: [time-nuts] UBlox GPSDO

Thanks to everyone for all the great replies. I figured that the 10 MHz output would have a fair bit of jitter/phase noise, but I figured I could use something like a SiLabs Si5317 to clean it up, as per this app note: https://www.silabs.com/Support%20Documents/TechnicalDocs/AN513.pdf Page 4 o

[time-nuts] UBlox GPSDO

According to page 51 of the protocol manual for the UBlox NEO-M* series GPS modules, the timepulse can be programmed to output a 10 MHz signal rather than a 1 PPS signal: http://www.u-blox.com/images/downloads/Product_Docs/u-bloxM8_ReceiverDescriptionProtocolSpec_(UBX-13003221)_Public.pdf I'm cu

Re: [time-nuts] Sources for Mission Time Clock

I think that display was built using modules like this: http://www.decadecounter.com/vta/articleview.php?item=511 I see them on e-bay from time to time under "in-line readout", but they're rather expensive and you'd need quite a few, If you can settle for 7 segment, a modern display you could

Re: [time-nuts] Si5351A

The specs for period, cycle-to-cycle and phase jitter are on page 6 of the data sheet, which is here: http://www.adafruit.com/datasheets/Si5351.pdf Wayne On Tue, Nov 11, 2014 at 12:49 PM, Joseph Gray wrote: > Some of you have probably already heard of this new clock generator chip > from Si.

Re: [time-nuts] Divide by five

I do a lot of work with SMD parts and would be happy to solder up and SOIC-16 version of the 74AC161, such as this one: http://www.digikey.com/product-search/en?pv633=35&k=74AC161&mnonly=0&newproducts=0&ColumnSort=0&page=1&stock=1&quantity=0&ptm=0&fid=0&pageSize=25 onto a dip break out board, su

Re: [time-nuts] New Guy, has HP 5061A with DATUM 7105A tube seeks advice

> http://www.artekmanuals.com has a nice scan of the manual if you can't > find a clean copy online. You will need to become familiar with the manual > sooner or later. > So, I ordered the manual from Artek and got a download link, but could never get the manual to download. The download instruc

Re: [time-nuts] New Guy, has HP 5061A with DATUM 7105A tube seeks advice

> If you get the tube working, you should use a counter or Lissajous display > with a GPS or rubidium standard to preset it to the correct resonance peak > frequency for lockup. The tube will probably be pretty noisy at first. If > it also has weak beam current, which is common, it will be very d

[time-nuts] New Guy, has HP 5061A with DATUM 7105A tube seeks advice

I recently picked up a 5061A surplus, but have no idea whether it works or not. The first hurdle is getting a power cord, but I'm still waiting for the proper connector to show up (the first one I ordered had the wrong orientation on the 3 pins.) In the meantime, I've been reading though what mat