[time-nuts] Re: Z3801A GPS Rx board substitute?

Hmmm ... I have four Z3805As, and one of them with 84k hours doesn't work any more ... in its case, LH reports no az/el/signal strength for ANY channels, i.e. it is not getting anything from the B1121P1114 Oncore receiver. But it throws no errors. I presume there is some problem in the front-end. +

[time-nuts] Re: Z3801A GPS Rx board substitute?

I pinged Art at oemi...@synergy-gps.com some time ago as they appear to have announced a drop-in replacement for the Oncore modules, but I never got a response. Dunno if they are still in business, etc. I would like some for my HP Z3805As ... He had previously posted to time-nuts: " "*I apologiz

[time-nuts] Re: 20210423: Introduction and Request for Spirent GSS4200 User Manual / Help

everal platforms are supported, some are dirt cheap. I used HackRF > because I already had one. Not sure about any of the others. > > On Sat, Apr 24, 2021, 11:56 AM Lux, Jim wrote: > > > On 4/24/21 10:31 AM, Andrew Kalman wrote: > > > Hi Paul. > > > > >

[time-nuts] 20220227: Beginner problems with Lady Heather and HP Z3805A

All: I'm trying to get Lady Heather 5.00 to work with my Z3805A. I know the Z3085A is working and talking (via direct SCPI commands over RS-232, see below) AND Lady Heather will launch and appear to do an initial connection. But then, Lady Heather just beeps every few seconds, and is completely h

[time-nuts] Re: electronics question or how not to fry my raspberry pi

I find that the best way to handle these translations is to use one of TI's level translators ... each chip has two power supply rails, and translation is done transparently across the chip, and there is good max voltage overprotection on both sides as well. I use them a lot to handle 5V <-> 3.3V

[time-nuts] Re: High precision OCXO supplier for end costomers

FYI, I contacted MTI a few years ago for some replacement 10MHz OCXO, and their minimum buy was 5 pcs. --Andrew Andrew E. Kalman, Ph.D. On Mon, Jan 10, 2022 at 12:46 PM Bob kb8tq wrote: > Hi > > Ok, well, the boys at Rakon / CEPE will be happy to sell you a ~

[time-nuts] Re: PPS latency? User vs kernel mode

This issue of interrupt latency is one place where cooperative RTOSes (as opposed to preemptive ones) have a clear advantage. The reason is that since context switching is explicitly called out (cooperative) instead of it happening at the interrupt level (preemptive), in a cooperative RTOS, the on

[time-nuts] Re: 1 pps / Gerber files

ing boards yourself, you get 5 boards, for less money than having > to go through a 3rd party, and avoiding USPO costs and delays. > > Cheers, > DaveM > > > > > > > > From: "Andrew Kalman" > To: "Discussion of precise time and frequency measu

[time-nuts] Re: 1 pps / Gerber files

I have boards built regularly at JLCPCB, I could certainly order a batch delivered to me, but I would have to send them all to someone else, to deal with distributing them out to folks on the list (I am time-constrained). ___ Andrew E. Kalman, Ph.D.a.

[time-nuts] Re: Tbolt

I'm a rank amateur on the time-nuts scale ... we did some replacements of MTI OCXOs a few years ago, and folded all that info into a manual as we built our own drop-in replacement OCXO modules for some XL Microwave and SRS instruments. It has some data on trim values for IsoTemp brand OCXOs, etc.

[time-nuts] Re: XL microwave

Yes it is ... Thank you! On Thu, Jun 17, 2021, 09:32 Lisa Perdue wrote: > This is what I have. Sorry, I don't know if it is relevant to the > counter(s) you have or are interested in. > > On Tue, Jun 15, 2021 at 4:43 AM Andrew Kalman wrote: > >> I'm also in

[time-nuts] Re: XL microwave

I'm also interested in a service manual (w/schematics) for these counters ... --Andrew Andrew E. Kalman, Ph.D. On Tue, Jun 15, 2021 at 1:28 AM Jan Boutsen wrote: > Hello all, > > I am looking for the SERVICE manual of a XL MICROWAVE counter . > The counter is

[time-nuts] Re: 20210423: Introduction and Request for Spirent GSS4200 User Manual / Help

know ... --Andrew On Sat, Apr 24, 2021 at 1:19 AM Andrew Kalman wrote: > So, an update. I was graciously provided with the User Manual for the > GSS4200 (thank you!). Having read through it and having played with my > GSS4200, I conclude the following: > >- My unit is functionally wor

[time-nuts] Re: Measuring the Thermodynamic Cost of Timekeeping

Wow .. I'm trying to visualize a non-thermodynamic clock :-) Andrew E. Kalman, Ph.D. On Tue, May 18, 2021 at 12:04 AM Azelio Boriani wrote: > > the full article is available > > related: >

[time-nuts] Re: 2nd Run of TimeHats

I'm interested in 1-2 units. --Andrew Andrew E. Kalman, Ph.D. On Mon, Apr 26, 2021 at 9:58 AM John Miller via time-nuts < time-nuts@lists.febo.com> wrote: > Hello everyone, > > I’ve seen a number of messages lately that reference the TimeHat boards I > put toge

[time-nuts] Re: 20210423: Introduction and Request for Spirent GSS4200 User Manual / Help

(Egg on face -- I meant to say exaHz-class processor, not attoHz :-) ) --Andrew Andrew E. Kalman, Ph.D. On Sun, Apr 25, 2021 at 12:02 PM Andrew Kalman wrote: > Just a comment on real-time programming. > > Obviously the accuracy of the real-time pe

[time-nuts] Re: 20210423: Introduction and Request for Spirent GSS4200 User Manual / Help

Just a comment on real-time programming. Obviously the accuracy of the real-time performance is a function of the hardware/software system's clock speed -- if you have an attoHz-class microprocessor (MCU), most things are going to look real-time to most people (except time nuts, of course :-) ) no

[time-nuts] Re: 20210423: Introduction and Request for Spirent GSS4200 User Manual / Help

of GPS emulators on ebay that > were priced about right for a hobbyist to consider. > Now at least if some unit shows up I will know what to look out for. Other > wise its a expensive box. > Thanks > Paul > WB8TSL > > On Sat, Apr 24, 2021 at 7:02 AM Andrew Kalman wrote:

[time-nuts] Re: Request for Spirent GSS4200 User Manual

have this locked down tight:-( > > Nigel GM8PZR > > > -Original Message- > From: Andrew Kalman > To: gandal...@aol.com; Discussion of precise time and frequency > measurement > Sent: Sat, 24 Apr 2021 10:28 > Subject: Re: [time-nuts] Re: Request for Spirent GSS4200 User Ma

[time-nuts] Re: Request for Spirent GSS4200 User Manual

Nigel. Thanks -- the file download worked, and now I have the USB drivers I'll have to test.Once I have the utilities disk, that is :-) One thing that I find odd is that the 4200 is a 6-channel machine, and it does 4100/6100 emulation, but there is no obvious way to "engage" the various channels

[time-nuts] Re: 20210423: Introduction and Request for Spirent GSS4200 User Manual / Help

full GSS4200 utilities disk, I'm kinda stuck. :-( --Andrew ---- Andrew E. Kalman, Ph.D. On Fri, Apr 23, 2021 at 1:15 PM Andrew Kalman wrote: > Hello. > > [SNIP] > > I am ** desperate ** for a User Manual for the Spirent GSS4200 GNSS > simulator (e.g., &g

[time-nuts] 20210423: Introduction and Request for Spirent GSS4200 User Manual / Help

Hello. This is my first post. I'm an EE who also dabbles in ME and CS. My first real job was at SRS (Stanford Research Systems), where I designed the look-and-feel and functionality of the SR560 (still in production, wow!), albeit with John Willison's help on the cascode front-end aiding this fres