[time-nuts] Adding holdover to your optical clock...

https://www.osapublishing.org/optica/fulltext.cfm?uri=optica-3-6-563=340980 ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the

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

Thx!!! André Esteves 2016-05-25 17:01 GMT+01:00 Sherman, Jeffrey A. (Fed) : > Hello, > > A recently published paper might be of interest to the time-nuts > community. We studied how well an unmodified commercial software defined > radio (SDR) device/firmware could serve

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

Hi Very interesting paper, thanks for sharing !! One question: In many DMTD (and single mixer) systems, a lowpass and high pass filter are applied to the signal coming out of the mixer. This is done to improve the zero crossing detection. It also effectively reduces the “pre detection”

[time-nuts] Maser 0.7 nsec jumps solved

Maybe the simplest solution would be to try a rudimentary form of step-start relay to crank the A/C compressor. This used to be quite common before the days of VFD's and such. The regular start relay applies power to the motor via a resistor that limits inrush current to some safe level to start

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

Jeff thanks for sharing the document with time-nuts. Others with more knowledge will comment I suspect over the next 24 hours. I did read through the document with interest and there are some alternates to a $1K sdr as you suggest. However since I have had an opportunity several times to build a

[time-nuts] Connor Winfied FTS125

Hello, I use the Connor Winfield FTS125 Disciplined GPS module in a system we make. I have three customers all complaining about the same thing. The NMEA output suddenly stops for no reason. It needs a power cycle to restore. But it only occurs every few months and at completely random

Re: [time-nuts] I thought GPS repeated every 12 hours (-2 minutes)

> Multipath on GPS normally requires a couple of things: > > 3) The signal path length has to be close enough that the normal firmware > does not reject > the solution. > Expanding on this a bit, because it's relevant to the "aircraft causing multipath" question, the pseudo random noise

Re: [time-nuts] Last Call Group Buy Ublox LEA-6T

I had some of these boards made: http://openbsc.osmocom.org/trac/wiki/osmo-lea6t-gps from the Gerbers in the git repo. I'm running the cheaper LEA-6S modules for prototyping but the boards seem to work well and were designed for the pin compatible LEA-6T you're after. On 25 May 2016 at 23:30,