[time-nuts] Re: The amazing $5 timestamper, part 2: discovering a bug in my signal generator

Hi, yes, the STM32F4xx series has the spread spectrum feature, the STM32F3xx does not. See the RCC_SSCGR (reset and control clock spread spectrum clock generation register), Bit 31 in

[time-nuts] Re: PN measurement thesis published

Hi, German is a gorgeous language, I can assure ;)) Im diving into it for decades now and still find new things. Mark Twain showed a somewhat different opinion, see his 'The awful german language'. Cheers Detlef

[time-nuts] Re: Complex PLL

schrieb am 17.03.2021 19:20:49: > Von: "Magnus Danielson" > An: time-nuts@lists.febo.com > Datum: 17.03.2021 19:59 > Betreff: [time-nuts] Re: Complex PLL > > Hi, > > On 2021-03-17 17:20, Detlef Schuecker via time-nuts wrote: > > Hi time-nuts, > > >

[time-nuts] Complex PLL

Hi time-nuts, a PLL takes the phase difference of the incoming signal and the synthesized signal and feeds that in a loop filter. The output of the loop filter is used to steer the local oscillator. In my setup I have an incoming complex signal and my local oscillator is generating a complex

Re: [time-nuts] Mains Frequency

The Berlin grid was isolated from '48 until begin of the '80s. Berlins BEWAG was very proud of running a stable net on this island. They used a big bunch of energy storage devices: steam under pressure, batteries etc. to keep the frequency and phase stable. In begin/mid '80s they built a 380kV

Re: [time-nuts] Daft idea with the National Grid

Hi, zero cross detection is not the best way to track grid frequency. I built my grid frequency tracker with a uC sampling the grid at 160ks/s and 12Bit. It is clocked by a TCXO. I fit a sine wave for every cycle of the grid. Fitting a sinewave is a linear problem, you do not need any

[time-nuts] near-Blackout Europe

Dear time-nuts, on Jan.8, 13:04:54 UTC, the european grid frequency dropped from 50.0269Hz to a minimum of 49.7343Hz 13.4sec later, see fig 1, plot starting at 13:00, x-axis in sec. . As a result southeast Europe was split from the rest, the frontier crossing the Balkan countries, see

Re: [time-nuts] WWVB SDR discussion

Hi, you do not necessarily need a variable ( physical ) oscillator. You mix the signal down in the digital domain. A 'digital local oscilator' is a mere complex value, which is rotated and the power is adjusted: #define CMUL(_a,_b,_c) \ { _c.re = _a.re*_b.re-_a.im*_b.im; \ _c.im =

Re: [time-nuts] WWVB PM Time Questions

Hi, > principles. The STM32L4 series which I often use has a pretty decent > ADC: fast (5 MSPS), with about 11 good bits in differential mode, and > "proper" hardware downsampling (called the DFSDM in the manual). If the Yes, the STM32 series also have built-in OPAmps, so one could hook up a

Re: [time-nuts] low power divide by 5

Hi, yes, it is self-clearing. It cycles 0 4 6 7 1 (leftmost FF MSB), 2 clears to 7, 3->1, 5->2. On one output you get 3/5 duty cycle, on the other two you get 2/5. Detlef Schücker Von:"Robert LaJeunesse" An: time-nuts@lists.febo.com Datum: 01.07.2020 09:30 Betreff:Re:

[time-nuts] low power divide by 5

Hi, there are three JK-FF, with Q1 as MSB, Q3 as LSB. J1,K1 ist input to Q1, etc. . There are 8^6 possibilties (6 inputs to the Qx or QxNOT or to HIGH or to LOW) of which 2069 generate a cycle length of 5. The following wiring will generate the cycle 1 3 5 2 4 : J1=Q2 K1=Q1 J2=Q3 K2=Q2

Re: [time-nuts] Mains frequency data for Europe

Hi, I uploaded european frequency data starting 2019 to ftp site 'dschuecker.dyndns.org' name/pw 'mainsf'. feel free to download Cheers Detlef Von:"Azelio Boriani" An: "Discussion of precise time and frequency measurement" Datum: 25.03.2020 02:30 Betreff:Re: [time-nuts]

Re: [time-nuts] Aerial coax downlead placement

Hi, > Plus as the pole moves in the wind (they all do) the cable can move > about inside, and if repeatedly impacting the inside of the pole over > time, that will damage the cable. You fix the cable inside the pole by applying three cable ties as a triangle in regular intervalls. The loose