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

This is a follow-up on my experience with the GSS4200 Multi-channel GPS Simulator from Spirent. I was able to finally get the elusive "Utilities Disk" for the GSS4200, which includes the USB drivers and several utilities (talk over USB, talk over GPIB, combine scenarios into a scenario library, an

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

An update: I was able to obtain the complete Spirent GSS4200 Utilities disk/installer ... it seems to have everything required (scenarios, USB drivers, etc.). I haven't had a chance to play with them yet. If anyone is in a similar position to me and in need of this disk, let me know ... --Andre

[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 performance is

[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

Hi > On Apr 25, 2021, at 10:13 AM, Lux, Jim wrote: > > On 4/25/21 6:40 AM, Bob kb8tq wrote: >> Hi >> >> >>> On Apr 25, 2021, at 9:31 AM, Lux, Jim wrote: >>> >>> On 4/25/21 6:02 AM, Bob kb8tq wrote: Hi The thing that I find useful about a GPS simulator is it’s ability to

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

On 4/25/21 6:40 AM, Bob kb8tq wrote: Hi On Apr 25, 2021, at 9:31 AM, Lux, Jim wrote: On 4/25/21 6:02 AM, Bob kb8tq wrote: Hi The thing that I find useful about a GPS simulator is it’s ability to calibrate the time delay through a GPS based system. In the case of a GPSDO, there may be thin

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

Hi > On Apr 25, 2021, at 9:31 AM, Lux, Jim wrote: > > On 4/25/21 6:02 AM, Bob kb8tq wrote: >> Hi >> >> The thing that I find useful about a GPS simulator is it’s ability to >> calibrate the >> time delay through a GPS based system. In the case of a GPSDO, there may be >> things beyond the sim

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

On 4/25/21 6:02 AM, Bob kb8tq wrote: Hi The thing that I find useful about a GPS simulator is it’s ability to calibrate the time delay through a GPS based system. In the case of a GPSDO, there may be things beyond the simple receiver delay that get into the mix. Getting the entire offset “pict

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

Hi The thing that I find useful about a GPS simulator is it’s ability to calibrate the time delay through a GPS based system. In the case of a GPSDO, there may be things beyond the simple receiver delay that get into the mix. Getting the entire offset “picture” all at once is nice thing. Yes, t

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

I have used GPS-SDR-SIM with good results. It's an open source tool that will generate the right files to be able to generate simulated GPS signals using many of the open source SDR platforms including HackRF. It uses the publically available ephermis files along whith desired receiver position d

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

Hi The lowest cost “commercial” simulator that I know of is the Jackson Labs Claw: http://www.jackson-labs.com/index.php/products/claw_gps_simulator Taking a look at the manual: http://www.jackson-labs.com/assets/uploads/main

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

On 4/24/21 10:31 AM, Andrew Kalman wrote: Hi Paul. Yes, I've been on this same journey. After I learned (somewhat unrelated) that one is supposed to have an FCC license to rebroadcast GNSS signals (e.g. via a repeater inside a lab, makes eminent sense), I started thinking more about GNSS simulat

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

Hi The last time I recall this coming up, we were going after the single channel versions of these boxes. They are fine for doing a calibrated sensitivity test. They aren’t great for a full checkout of a receiver. For what little they cost (at least back then) not a bad deal. Bob > On Apr 24, 2

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

Hi Paul. Yes, I've been on this same journey. After I learned (somewhat unrelated) that one is supposed to have an FCC license to rebroadcast GNSS signals (e.g. via a repeater inside a lab, makes eminent sense), I started thinking more about GNSS simulators and how they might be added to my compan

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

Andrew Welcome to time-nuts. I really appreciate your detailed write up. I have seriously considered a used gps emulator a few times. Really don't need complex solutions. Its more for recovering and working on quite old GPS receivers and down converters like Austron 2201s. 1990s stuff. Whats great

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

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 working (well) -- 10MHz clock was not far off, output levels are correct, etc., it is gene