[time-nuts] Using the HP 58503a to correct your PC clock

Lady Heather has the ability to set the system clock from any just about any GPS receiver. It can set the clock every day, hour, minute, or when system time and receiver time diverge by more than "x" milliseconds. Most stock Windows systems have a clock granularity of +/- 15.6 milliseconds,

Re: [time-nuts] Commercial software defined radio for clock metrology

On Jul 29, 2016, at 5:14 PM, Kevin Rosenberg wrote: I had a question about your experience. You mentioned using a input signal near the maximum of the USRP’s ADC to get the best SNR. I reviewed the schematics and application notes. I found a maximum Vpp mentioned of 3.3V. I was wondering what

Re: [time-nuts] Effect of EFC noise on phase noise

Hi Picking some random 10811-ish numbers: 10 MHz output 5V EFC range 1.6 ppm total EFC range 10 Hz offset from carrier If you put in 300 nv of noise, in a 1Hz bandwidth, you get around -146 dbc of phase noise. Your OCXO would be doing very well at 10 MHz to run -135 dbc phase noise at 10 Hz.

Re: [time-nuts] Effect of EFC noise on phase noise

On Wed, 3 Aug 2016 14:01:30 -0400, you wrote: >Rick wrote: > >... > >> Anyway, what I was led to believe is that >> certain JEDEC 1N___ part numbers, with suffixes >> indicating noise properties, from particular >> vendors had much lower than average noise. Thus >> if a run of the mill zener

Re: [time-nuts] Effect of EFC noise on phase noise

Rick wrote: There are a couple of things here that don't add up, subject to remembering stuff from a LONG time ago One source of noise I didn't mention is leakage current in the varactor itself. They are actually pretty noisy devices because of this. It's entirely possible that the

Re: [time-nuts] Effect of EFC noise on phase noise

Am 03.08.2016 um 18:30 schrieb Richard (Rick) Karlquist: 1. Back in those days at least, there were vendors who supposedly specialized in providing low noise zener diodes. The particular breakdown voltage of zener diodes was important. IIRC, at low voltages, it is a true "zener" diode and at

Re: [time-nuts] Effect of EFC noise on phase noise

Hi Rick: My first engineering job was working on Tunnel Diode amplifiers at microwave frequencies (when transistors only worked at audio frequencies). The bias circuit was a 5.1 Volt Zener and a series diode just as your describe for temperature stability. There was also a BALCO (+ temp

Re: [time-nuts] Effect of EFC noise on phase noise

One further point regarding noise from the EFC voltage: The varactor in the oscillator will necessarily have a rather high resistance in series with it, which adds a certain amount of unavoidable Johnson noise. Also, the "other end" of the varactor is not generally grounded -- rather, it is

Re: [time-nuts] Effect of EFC noise on phase noise

Around 35 years ago, I worked with the guys who designed and manufactured the 10811. There are a couple of things here that don't add up, subject to remembering stuff from a LONG time ago: 1. Back in those days at least, there were vendors who supposedly specialized in providing low noise

Re: [time-nuts] Using the HP 58503a to correct your PC clock

Hi How big a correction are you seeing? Is the correction consistent? Bob > On Aug 2, 2016, at 11:13 PM, Ron Ott wrote: > > This has probably been covered in the past, but is there a way correct or > control a PC (Windows 7) clock with the HP 58503A GPS receiver? I

Re: [time-nuts] Effect of EFC noise on phase noise

Gerhard wrote: ... and a screen dump for the LTspice challenged BTW, it can be a lot easier to create multiple, parallel devices in LTspice by using the "m" command. (Multiple series devices -- passives and diodes -- can be created with the "n" command.) The schematics look cleaner, too.

[time-nuts] HP Panel colors

Good morning, Our company still produces the HP Agilent, Symmetricom, now Microsemi 5071A Cesium Frequency Standard. I noticed from the thread a Arnold Tibus may have another paint spec we are looking for: Clear Texture Enamel, Per HP Visual Texture Panel Finish Std. 6009-156 Any info

Re: [time-nuts] Sure GPS unit

It's available via eBay. SKG16A Bluetooth/RS232/USB UART GPS Module Demo Board http://www.ebay.com/itm/SKG16A-Bluetooth-RS232-USB-UART-GPS-Module-Demo-Board- /230844194302 Excellent! It went unavailable at one stage, so it's good to see it back. I'll have

[time-nuts] Sure GPS unit

david-tay...@blueyonder.co.uk said: > Some notes on using PPS with Windows may be gleaned here. Although the > device mentioned is no longer available, the general principles will apply. > http://www.satsignal.eu/ntp/Sure-GPS.htm It's available via eBay. SKG16A Bluetooth/RS232/USB UART GPS

Re: [time-nuts] Using the HP 58503a to correct your PC clock

This has probably been covered in the past, but is there a way correct or control a PC (Windows 7) clock with the HP 58503A GPS receiver? I just bought one (on the way now) and have a copy of satstats50 on hand. I've been using Dimension 4 and I'm surprised at the size of correction every

[time-nuts] Using the HP 58503a to correct your PC clock

This has probably been covered in the past, but is there a way correct or control a PC (Windows 7) clock with the HP 58503A GPS receiver? I just bought one (on the way now) and have a copy of satstats50 on hand. I've been using Dimension 4 and I'm surprised at the size of correction every