[time-nuts] Re: measuring tiny devices

Hi Ed: You might surf the Accessories Catalog for Impedance Measurements. https://www.keysight.com/us/en/assets/7018-06727/brochures/5965-4792.pdf They have a number of SMD fixtures for 4-terminal pair LCR meters. https://prc68.com/I/Z.shtml#KeyDocs -- Have Fun, Brooke Clarke

[time-nuts] The Newest Second: NIST-F2

Hi: https://www.nist.gov/si-redefinition/second/second-present NIST Launches a New U.S. Time Standard: NIST-F2 Atomic Clock https://www.nist.gov/news-events/news/2014/04/nist-launches-new-us-time-standard-nist-f2-atomic-clock First accuracy evaluation of NIST-F2 (behind paywall)

[time-nuts] Re: W.E. 38C oscillator

Hi John: Can you post a photo or two? -- Have Fun, Brooke Clarke, N6GCE https://www.PRC68.com axioms: 1. The extent to which you can fix or improve something will be limited by how well you understand how it works. 2. Everybody, with no exceptions, holds false beliefs. Original

[time-nuts] Re: Time Signal Transmitter (low power)

Hi Anthony: For efficient transmission of radio signals the antenna should be at least 1/4 wavelength in size.  At 60 kHz a wavelength is 5,000 meters so a 1/4 wave is 1250 meters (4100 feet).  If the antenna is smaller than 1/4 wavelength the efficiency goes down.  So if you were to wrap a

[time-nuts] Re: Where do people get the time?

Hi Bill: Here are a couple of web pages on the Western Union clocks made by the Self Winding Clock Co: https://prc68.com/I/SWCC.shtml https://prc68.com/I/SWCC2.shtml I think it was more like 200 Volts and it's important because the time constant of an L - R circuit is L/R, so by adding a

[time-nuts] Re: Why do have OCXO a Vref output?

Hi: I'd second this.  When I was working at HP on the Kobe Instrument Division products (component testers) the 4352S VCO tester had a very special power supply for the tuning voltage that was extremely clean so as not to detract from the VCO under test. -- Have Fun, Brooke Clarke, N6GCE

[time-nuts] Re: Clock displays -- eye response

. -- Have Fun, Brooke Clarke, N6GCE https://www.PRC68.com axioms: 1. The extent to which you can fix or improve something will be limited by how well you understand how it works. 2. Everybody, with no exceptions, holds false beliefs. Original Message On 12/10/21 12:31 PM, Brooke C

[time-nuts] Re: Clock displays -- eye response

Hi Hal: There has been some recent research into illusions related to sight and sound. https://en.wikipedia.org/wiki/McGurk_effect - related to speech and search "audio optical illusion" I like a crisp "tick" for clock human synchronization. I wonder why there has not been more done with

[time-nuts] Re: Clock Display on Linux: Update

Hi Adam: Years ago I built a hardware clock display settable to 1 ms based on a PIC 16F88 microcontroller.  The idea was to attach these to frequency standards thus making them into precision clocks. https://www.prc68.com/I/PRC68COM.shtml#07092006 There are some tricks to writing PIC assembly

[time-nuts] Re: FS740 Thoughts?

Hi Dana: My PRS10 is a couple decades old and I use it in the 1PPS locking mode.  But that may not have been the default.  Maybe the surplus units just need the correct jumper change. https://prc68.com/I/PRS10.shtml -- Have Fun, Brooke Clarke https://www.PRC68.com axioms: 1. The extent to

[time-nuts] Re: Potting compound advice needed

Hi Jim: Be careful with RTVs.  Some out gas acid that attacks metal, even gold plated metal.  Guess how I know that. -- Have Fun, Brooke Clarke https://www.PRC68.com axioms: 1. The extent to which you can fix or improve something will be limited by how well you understand how it works. 2.

[time-nuts] Re: NBS 1000 CPS Tuning Fork Standard?

021 Oct 14, at 18:59 , Brooke Clarke via time-nuts wrote: Hi: Somehow I got dropped from the mailing list around March 9, but have been added back. Hi: I recently stumbled onto this at the Wiki page for tuning forks: https://en.wikipedia.org/wiki/Tuning_fork#In_clocks_and_watches Showing an NB

[time-nuts] NBS 1000 CPS Tuning Fork Standard?

Hi: Somehow I got dropped from the mailing list around March 9, but have been added back. Hi: I recently stumbled onto this at the Wiki page for tuning forks: https://en.wikipedia.org/wiki/Tuning_fork#In_clocks_and_watches Showing an NBS 1,000 CPS standard. related to a discussion on the