Re: [time-nuts] nuts about position (cheap receiver)

On Sat, May 5, 2018 at 12:08 AM, Mark Sims wrote: > You could add doppler to the RINEX file. All the receivers with raw > messages seem to output that. I think the Doppler measurements can be omitted for static positioning. CSRS-PPP results for a submission with/without

Re: [time-nuts] Ashtech Z12 question.

> > Does the Z12 have an internal memory backup battery? Yes, there are two lithium thionyl chloride cells, Tadiran TL-5104. They are 3.6 V primary cells, cylinders roughly AA in size, with spot-welded axial leads. That part is obsolete, but Digikey has an equivalent, TL-5903/P, which worked

Re: [time-nuts] Ashtech Z12 question.

Hi What you describe sure sounds like a ram battery died sort of thing. I’ve never noticed one in the boards I’ve torn apart. I’d also admit that was a few years back …. Bob > On May 6, 2018, at 6:12 PM, Mark Sims wrote: > > I just added support for the Z12 to Lady

[time-nuts] Ashtech Z12 question.

I just added support for the Z12 to Lady Heather and fired up my Z12 for the first time in a few years. It powers up in some kind of a weird loopback mode and you have to reset the receiver memory to get it working. Does the Z12 have an internal memory backup battery? Mine is currently

[time-nuts] WWVB: measuring local 60 KHz noise

On 5/6/2018 6:39 AM, Charles Steinmetz wrote: So, yes, a sound card designed for signals up to ~22kHz should handle SAQ at ~17kHz, but sound cards that can digitize signals above 22kHz are rare. Some "professional" sound cards handle signal frequencies up to ~40kHz, but very, very few handle

Re: [time-nuts] WWVB: measuring local 60 KHz noise

Long ago I did some WWVB signal-to-noise measurements with an HP 3586C selective voltmeter (commonly used by the FMT-nuts).  I measured the signal power at 60.0 kHz with 20 Hz bandwidth.  Then I measured the power a small offset plus and minus  (100 Hz?  I don't recall), and took the mean of

Re: [time-nuts] WWVB: measuring local 60 KHz noise

Hi First off, I don’t think there *is* an ideal antenna that “just works”. Maybe a proper set of EMAG probes that come with calibration sheets come close. For a home built this or that …. there are a lot of variables. First up is very much part of receiving WWVB in the first place. Coax to

Re: [time-nuts] WWVB: measuring local 60 KHz noise

Hi Hal: You might want to check the orientation and location of the antenna before digging into more technical areas. It's been my experience there's a lot of AC mains conducted noise at 60 kHz. http://www.prc68.com/I/LF-Ant.shtml#Noise http://www.prc68.com/I/Spec_0002.shtml - 0 to 200 kHz

Re: [time-nuts] 4046 replacement

Hi Charles, On 05/06/2018 06:08 PM, Charles Steinmetz wrote: > Magnus wrote: > >> If you use it without care and knowledge, beware. That goes for any >> tool we apply > > Indeed!  The Cardinal Rule of design!  (So often unfollowed) > > "An engineer is someone who can figure out what

Re: [time-nuts] WWVB: measuring local 60 KHz noise

Hal wrote: I assume the problem is noise. Is there any simple way to measure the noise around 60 KHz? How about not so simple? Extra credit for a way that others nuts can reproduce so we can compare the noise at my location with other locations. For any location near a city, the noise

Re: [time-nuts] 4046 replacement

Magnus wrote: If you use it without care and knowledge, beware. That goes for any tool we apply Indeed! The Cardinal Rule of design! (So often unfollowed) "An engineer is someone who can figure out what questions need to be asked, figure out how to answer them, and tell when they are

Re: [time-nuts] WWVB: measuring local 60 KHz noise

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Re: [time-nuts] 4046 replacement

Hi, On 05/06/2018 01:02 PM, Charles Steinmetz wrote: > Alexander wrote: > >> but as I wrote a while ego ADI has a bit different chip which is free of >> dead zone and much faster > > Hell, there are literally hundreds of PLL chips, lots of them better at > various things than the 4046.  I did

Re: [time-nuts] 4046 replacement

Alexander wrote: but as I wrote a while ego ADI has a bit different chip which is free of dead zone and much faster Hell, there are literally hundreds of PLL chips, lots of them better at various things than the 4046. I did not suggest that the 4046/7046/9046 is the best PLL for any

Re: [time-nuts] 4046 replacement

but as I wrote a while ego ADI has a bit different chip which is free of dead zone and much faster, I used it for low phase-noise clock generator for 3,1Gb/s fiber optic systems of C-Cor/Comlux in the end of the past century, now I am on vacation and do not have my engineering note books with

Re: [time-nuts] 4046 replacement

See below for further information on working with the 4046/7046/9046 PLL families, including must-have design tools for anyone designing with these devices. I wrote: The "flaw" in the 4046 is a dead zone around zero error in Phase Comparator 2 (the PC one generally uses). Magnus responded: