[time-nuts] PRS10 Breakout board

Searching the list I see that several years ago someone designed a PRS10 breakout board.. Does anyone have any details on it? I managed to source some of the connectors today. The cost for the bonafide board is rather high when you add in shipping to Canada. I have done a board for a Temex

Re: [time-nuts] Mentorship needed in learning about Allan Deviation and variation.

Joe, > I log the output of the TIC, in nanoseconds, and use that file to generate an ADEV plot. Good. That's what you need. During normal operation those readings are bounded by the PLL. So it's essentially a measurement of how well the PLL is working, how aggressive the OCXO is steered,

Re: [time-nuts] Mentorship needed in learning about Allan Deviation and variation.

Hi To be really clear: ADEV can be used to measure anything and done any way you wish. To have an ADEV that is a valid measure of a device, you need to do a comparison to another *totally independent* device. That independent device needs to have a better ADEV over the range of Tau that you

Re: [time-nuts] Mentorship needed in learning about Allan Deviation and variation.

Hi > On Oct 26, 2020, at 3:36 PM, Joe & Gisela Noci wrote: > > Bob, thanks for the very detailed explanation. It starts to make much more > sense. > > To answer your question, yes, the 10MHz OCXO I am measuring is part of the > GPSDO and is steered to GPS 1PPS. > The process I explained ( the

Re: [time-nuts] Rapco 1804M manual and Control Mode Access ?

Hi, The 1804M was produced in different versions. Is your unit merely called 1804M, or perhaps 1804M MK2, or 1804M3? BR Ole Den 26-10-2020 kl. 16:45 skrev Chris Quayle: Hi, Looking for the user manual for the above gpsdo. At power up, keeps repeating gps status and time, whereas there is an

Re: [time-nuts] Mentorship needed in learning about Allan Deviation and variation.

Bob, thanks for the very detailed explanation. It starts to make much more sense. To answer your question, yes, the 10MHz OCXO I am measuring is part of the GPSDO and is steered to GPS 1PPS. The process I explained ( the 1PPS and the 1MHz clock from the OCXO / 10 into the flip flop, etc) and the

Re: [time-nuts] Rapco 1804M manual and Control Mode Access ?

Hi Normally a date roll over bug is a non-fixable item in these older devices. The basic GPS modules simply did not start to have the “smarts” to handle this until at least a decade after they went out of production. Simple answer is to leave it as is and just use the frequency output. If you

[time-nuts] Rapco 1804M manual and Control Mode Access ?

Hi, Looking for the user manual for the above gpsdo. At power up, keeps repeating gps status and time, whereas there is an internal control mode for setup. Works fine and locks to gps, but the year is stuck at 2001, suggesting a date rollover bug. Internal GPS engine a a (Trimble ?) TNL22880

[time-nuts] Query about insulated coax panel connectors

The 106D DMTD unit was designed by NBS (now NIST), and the BNC connectors I mentioned were also isolated from the chassis. The shield side was bypassed to the chassis ground inside via a 50 Ohm resistor and a .1uf capacitor. I retained those when I converted to isolated SMA. The center pin and

Re: [time-nuts] Mentorship needed in learning about Allan Deviation and variation.

Hi > On Oct 26, 2020, at 10:53 AM, Joe & Gisela Noci wrote: > > Hi again Bob - Seems I am destined to hog your time! > > If my understanding and my questions appear foolish, sorry - I do have a > lot to learn to just understand the basics. > > Maybe my setup is in fact comparing itself with

Re: [time-nuts] Mentorship needed in learning about Allan Deviation and variation.

On 2020-10-26 15:17, Bob kb8tq wrote: > Hi > > Any practical measure you feed into an ADEV computation will be a look at > “device A” versus “device B”. In this case one of them is your GPSDO. What > is the other device? ( = your TIC has a DUT input and a REF IN, it compares > one to the other

Re: [time-nuts] Mentorship needed in learning about Allan Deviation and variation.

Hi again Bob - Seems I am destined to hog your time! If my understanding and my questions appear foolish, sorry - I do have a lot to learn to just understand the basics. Maybe my setup is in fact comparing itself with itself?..! I'll try to explain my hardware concisely - The GPS 1PPS (with

Re: [time-nuts] Mentorship needed in learning about Allan Deviation and variation.

Hi Any practical measure you feed into an ADEV computation will be a look at “device A” versus “device B”. In this case one of them is your GPSDO. What is the other device? ( = your TIC has a DUT input and a REF IN, it compares one to the other ….). If you feed your measurement system with the

[time-nuts] Mentorship needed in learning about Allan Deviation and variation.

Hi to all, Very new and green at this .. I am trying to understand more about Allen Deviation, a subject about which I , for practical purposes know 'nothing'.. I have spent a lot of time digging on internet and have read many articles , inc W.J Wriley publications, the Stable32 files and user