[time-nuts] HP nixie counters, free!

Hi All, I have some old HP nixie tube counters (5245Ls) which I would like to give away to a good home. See the attached photo. (Sorry for the poor quality.) Some of them power on, some of them do not. I don't think any of them actually work correctly. They would be good for parts. I am

Re: [time-nuts] PLL performance?

But I assume the drive for the pendulum is some impulse. Not the old > mechanical clock with a spring for power. > Regards > Paul > WB8TSL > > On Wed, Mar 22, 2017 at 7:48 PM, David Scott Coburn <scot...@optonline.net> > > wrote: > > I will not be using an off-

Re: [time-nuts] PLL performance?

; so easy. Hall/optical have a softer switch on/off curve. Depending what you > choose to instrument your pendulum may also introduce more jitter. The > 20logN dosen't help either, 1 millideg at 0.5 Hz is 5.5 cycles at 1 MHz. > > On Mon, Mar 20, 2017 at 9:07 PM, David Scott Coburn <sco

Re: [time-nuts] PLL performance?

an long lock times. Very > long lock times. Engineering is the art of making what you want from what > you can get at a profit. I like Polywell Fusion. > > > On Tuesday, March 21, 2017 2:01 AM, David Scott Coburn > <scot...@optonline.net> wrote: > > > >

Re: [time-nuts] PLL performance?

Thanks Tom. Scott On Tuesday, March 21, 2017 2:08:14 AM EDT Tom Van Baak wrote: > Andy, Bill, et al. > > Attached is a GIF version of Scott's (unreadable?) > histogram-utcday21613x.pdf file. > > /tvb > > - Original Message - > From: "Andy" > To: "Discussion of

Re: [time-nuts] PLL performance?

r, it does show that my TSC triggering and latching circuits are working correctly.) > > http://www.thinksrs.com/assets/instr/PRS10/PRS10diag2LG.gif > > Some additional GPSDO, pendulum/PLL, pendulum ADEV links: > > http://leapsecond.com/pages/gpsdo/ > > http://leapsecon

Re: [time-nuts] PLL performance?

Ack! Sorry for the questionable PDF file. It was generated by gnuplot on my Linux system. I see that Tom has posted a gif of the image, so I won't duplicate it. Cheers, Scott On Monday, March 20, 2017 10:36:05 PM EDT Bill Byrom wrote: > Hi, Scott. I rarely post here, but just noticed your

Re: [time-nuts] PLL performance?

On Tuesday, March 21, 2017 12:26:59 PM EDT Attila Kinali wrote: > Moin, > > On Mon, 20 Mar 2017 21:07:03 -0400 > > David Scott Coburn <scot...@optonline.net> wrote: > > I have built and tested a PLL circuit that will be used to generate a 1 > > MHz > >

[time-nuts] PLL performance?

Hi All, I have built and tested a PLL circuit that will be used to generate a 1 MHz signal locked to a 0.5 HZ signal from a pendulum. (Details available upon request.) The circuit is a classic 4046 generating the 1 MHz signal which is fed into a 2e6 digital divider which outputs 0.5 Hz which

Re: [time-nuts] HP5065A Rubidium questions: some progress

I installed a 10 ohm 1/2 watt carbon resistor and the Rb lamp came right on!  Woo-hoo! I will get a better quality, high temperature resistor to replace this one.  (RN70?) How critical is the resistance value?  10 ohm?  12?  Is there a way to test for an optimum value? Scott On Tue,

[time-nuts] HP5065A Rubidium questions: some progress

Hi All, Thank you all for the very helpful suggestions! I will try to reply to you all in this one post. I opened up the A12 assembly and was happy to find that the lamp, windows, and reflector all appear to be in good physical condition.  There is some very light corrosion on the

[time-nuts] HP5065A Rubidium question

I have an HP5065A Rubidium Frequency Standard which is not working. All of the oven temperatures look OK. The power supply voltages look OK. The ~60 MHz going into the RVFS package looks OK. The 5.000 MHz and the ~5.315 MHz signals are within a few Hz. (The unit is running open loop only.) The