[time-nuts] Re: function generator

Jeremy Elson writes: > [...] I plugged an RbXO into the DG1022Z and simply asked the > DG1022Z to divide it down to a 1pps signal. That is, I configured it to > create a pulse with a small duty cycle and 1hz frequency using the external > clock as a reference. To my surprise, it introduce

[time-nuts] Re: GPS Elevation Mask Values.

A few short observations: http://ni6e.com/gps_horizon/ Peter On 11/21/2021 10:25 PM, Björn wrote: Hi Keelan, Just a minor observation. Depending on your location. An azimuth pointing directly north is not the same as that the satellite is directly over the North Pole. At 58N in Europe I c

[time-nuts] Re: GPS Elevation Mask Values.

Hi Keelan, Just a minor observation. Depending on your location. An azimuth pointing directly north is not the same as that the satellite is directly over the North Pole. At 58N in Europe I can see satellites with low elevation directly north. It is satellites showing up from “over” Alaska. K

[time-nuts] Re: NTP servers

Hi, I am running a very interesting public server, for about 15 years. i386, 32-bit, Linux, on very old hardware with a serial port. Has a GPS (single constellation) device plugged in, about $35. I run gpsd (https://gpsd.io) , and it talks to the NTP servers over SHM, with PPS. When the NTPsec

[time-nuts] Re: NTP servers

Highly recommend the LeoNTP. If you are in the US, there is still one in stock here: https://v3.airspy.us/product/upu-leontp/ Denny > On Nov 21, 2021, at 18:52, W7SLS wrote: > > Another option is the Leo Bodnar NTP device, though it appears to be out of > stock at the moment

[time-nuts] Re: NTP servers

Welcome, and here are a few thoughts: One of the members developed a ’TimeHat’ that sits on top of a Raspberry Pi. GPS and more. I purchased tow of them, and am quite happy with them. https://millerjs.org/timehat Another option is the Leo Bodnar NTP devic

[time-nuts] NTP servers

Hi all, I am new to the mailing list, and pretty new to timing stuff in general. I wanted to ask if any of you folks who have a more advanced set-up (synchronization via gps/radio, or just a well working rubidium clock or something) maintain a solid stratum 1 NTP server. Of course, I am aware that

[time-nuts] Re: function generator

I own a DG1022Z and have used it for time-nuttery from time to time. It's not the best device for such a thing, unfortunately. The positive: you can plug a 10mhz reference clock in the back and the DG1022Z will lock to it. The internal oscillator appears to be a garden-variety crystal (mine has an

[time-nuts] Finding a replacement VFD for my 58503A GPSDO

Hi all, Well, there's no getting around the fact that I need replacement VFD for my 58503A. It turns out that the pin that's supposed to illuminate segment E does nothing. In fact, running through a few other pins, I found some that illuminated more than one segment, so this VFD is definitely o

[time-nuts] function generator

Hi, A few days ago I bought a Rigol DG1022Z function generator. Works really well from what I can see. Especially compared to my previous solution (a sound-card in my laptop with a few resistors and a capacitor to adjust the signal level) :-) Now I noticed that on the back there are a few bnc conn

[time-nuts] Re: Frequency Standard - Where Can I Get One.

Hi, So, on that note. I am surprised that I have not seen popular telecom rubidiums being reverse-engineered. For instance, the LPRO-101 should have been reverse-engineered a long time. Some of the circuitry is known from patents, but those do not build up a complete schematic. I've considere

[time-nuts] Re: Frequency Standard - Where Can I Get One.

Hi Well, if I could keep a 5065 running without repairs for more than a couple years I might be more willing to agree with you. What makes the 5065 different is that you have schematics and can do repairs. When the telecom gizmos die, there’s not much to fall back on. They were designed to run

[time-nuts] Re: Frequency Standard - Where Can I Get One.

Hello Time-Nuts, No offense Bob, but I would like to take issue with your statement 'Rb standards have a finite life'. There are time-nuts on this list of every skill and knowledge level and I would like to keep the information as correct as possible. My feeling is this is not a true statement.

[time-nuts] Re: PN9000 software?

The news may be worse that you think. I vaguely remember we had one of these a long time ago at HP/Agilent. You pretty much had to have the Dell workstation; the software didn't run on just anything. I know that the Agilent (now Keysight) PN system came with its own computer and you got an image o

[time-nuts] Re: PN9000 software?

Hi Jim, did you buy the one from bmi-surplus? I was thinking about it for a long time. But the missing Software Problem ... I was too lazy until noch to contact  the manufactor. Maybe you could purchase a licence there. Its a nice solution, if you can make it work. All the best Norman Gesendet v

[time-nuts] Re: GPS Elevation Mask Values.

Santa is testing his new SteSle[tm]? *) Kidding aside, maybe it is an idea to see if the position reported by the various GPS starts to "wander"? I assume any spoofing/scrambling should be noticable too, apart from the SV plot that LH reports. Maybe good GPS reject "implausible" SV locations fro

[time-nuts] Re: GPS Elevation Mask Values.

I still feel like an important point is being overlooked here: The receiver can not directly tell where in the sky the satellite is. It's impossible to determine that from a single point of observation. All the receiver can discern is the distance to the satellite. The sky plot is a prediction, not

[time-nuts] PN9000 software?

I recently purchased an Aeroflex PN9000 system with the correct modules for doing phase noise measurements. However, I haven't been able to figure out how to get the software for this system. The only digital interface is GPIB. I believe that from the factory the system came with a Dell worksta

[time-nuts] Hermetic tantalum capacitors

When I was a lad designing telecom kit that had a minimum design life of 20 years, we used Sprague tantalum cased glass sealed capacitors that were treated like gold dust. Sprague has now been subsumed into Vishay and they still do the same devices, stocked by Mouser and Digikey at reasonable p