[time-nuts] Measurement of Peak Frequency Using a Perseus SDR

I believe I finally have my frequency measurement process refined and have described it here: https://drive.google.com/open?id=1luVumTygkvfnDsZvGZGSsJA75IwMKmJ8 Comments, corrections and criticism are welcome. Regards, Mark W7MLG ___ time-nuts

Re: [time-nuts] Short term 10MHz source

> If you are working on the firmware, consider adding a time-nuts mode that > also > includes the post-calibration data. Hal, When you power up the TICC, go into D (debug) mode. Then instead of just outputting timestamps, it will output: # time1 time2 clock1 cal1 cal2 PICstop tof timestamp

Re: [time-nuts] Short term 10MHz source

t...@leapsecond.com said: > Here's what's happening. Unlike the counters mentioned above there is no > fixed cycle or fraction in the TICC. The ring counter is free-running and its > rate can vary from unit to unit, from temperature to temperature, from > reading to reading. That's why the

Re: [time-nuts] Short term 10MHz source

> OK, now I've got it. I wasn't seeing the humps as being many slight > variations > around the 50ps points. Just had my mental scaling all wrong. > In other words, the TICC's resolution is "blurred" around the nominal value > rather > than being aligned to a precise increment. John, Yes,

Re: [time-nuts] Short term 10MHz source

Hi, On 1/9/19 3:05 AM, Tom Van Baak wrote: >> Wouldn't any counter that has 50 picosecond resolution look the same? > > Nope. If you had a 20 GHz timebase you'd have 50 ps resolution and all your > readings would be exact multiples of 50 ps. It would be very clean and > simple. Readings of 25

Re: [time-nuts] Short term 10MHz source

OK, now I've got it.  I wasn't seeing the humps as being many slight variations around the 50ps points.  Just had my mental scaling all wrong.  In other words, the TICC's resolution is "blurred" around the nominal value rather than being aligned to a precise increment. I wonder if it would

Re: [time-nuts] Short term 10MHz source

> Wouldn't any counter that has 50 picosecond resolution look the same? Nope. If you had a 20 GHz timebase you'd have 50 ps resolution and all your readings would be exact multiples of 50 ps. It would be very clean and simple. Readings of 25 ps or 49 ps or any other non-multiple of 50 ps would

Re: [time-nuts] Short term 10MHz source

Hi A very software defined radio centric way to look at the same thing: If you have a SDR with a noise free front end and a perfect ADC, the radio may be deaf. Small signals come in and no bits are toggled. That’s what you get on the “phase locked” channel in the TIC. (yes this assumes the

Re: [time-nuts] Short term 10MHz source

John, Recall that the quantization is really a form of time-stamp value for the channel in it's relation to the time-base. It's a systematic pattern in the time-base clock and it is phase-locked to the time-base phase. Let's just think of our time-base as being a 10 MHz. That 100 ns cycle is

Re: [time-nuts] Short term 10MHz source

You've mentioned this before, and I'm having trouble getting my head around it. I may have this all wrong, but isn't the quantization simply the resolution of the device? Your histogram shows humps about 50 picoseconds apart, but that's the resolution of the counter. Wouldn't any counter

Re: [time-nuts] Short term 10MHz source

Hi John, Sure, and that makes perfect sense for that context. I'm just saying that sometimes the setup may perform better than expected as you end up accidentily in this setup, or you can choose to use this intentionally. Cheers, Magnus On 2019-01-08 21:11, John Ackermann N8UR wrote: That

Re: [time-nuts] Short term 10MHz source

Actually, one TICC can do three-cornered hat, assuming you can arrange one source to be 10 MHz and the other two to be PPS. There's a "TimeLab" mode that generates timestamps of chA vs. ref, chB vs. ref, and synthesizes chC as (ChB - Cha +chB_int_second). In other words, the absolute chC

Re: [time-nuts] Short term 10MHz source

That makes sense. I was thinking of the case where the reference and channels were asynchronous. On 1/8/19 1:53 PM, Magnus Danielson wrote: John, Depends on your setup. If one of the channels is synchronous with the time-base, then you can expect much less noise on that channel, since you

Re: [time-nuts] Short term 10MHz source

Hi Next we would need LH support for three TICC’s to do three corner hat …. :) Maybe a module for each TICC ….. Bob > On Jan 8, 2019, at 2:37 PM, Magnus Danielson wrote: > > Hmm... and idea. > > For some GPSDOs you get a PPS and is "raw" from GPS module and not > resynthesized from the

Re: [time-nuts] Short term 10MHz source

Hmm... and idea. For some GPSDOs you get a PPS and is "raw" from GPS module and not resynthesized from the steered 10 MHz. Now, if one uses this PPS it would get quite a bit of noise, but if one was to measure that noise against the smoothed 10 MHz with a separate TIC/TICC one should be

[time-nuts] Short term 10MHz source

Lady Heather also supports the TICC. The TICC can be the main input "receiver" device and/or an auxiliary input device. With two TICCs connected you can process four channels of data. Heather lets you configure the main input device TICC parameters and also has the ability to "tune" the

Re: [time-nuts] Short term 10MHz source

John, I suppose this and all my measurenents are made in time stamp mode. Thanks for the work you have done. Luciano Da "time-nuts" time-nuts-boun...@lists.febo.com A time-nuts@lists.febo.com Cc Data Tue, 8 Jan 2019 13:48:22 -0500 Oggetto Re: [time-nuts] Short term

Re: [time-nuts] Short term 10MHz source

John, Depends on your setup. If one of the channels is synchronous with the time-base, then you can expect much less noise on that channel, since you are not sweeping two clocks asynchronous to the time-base, so you will for relatively clean sources only expose a fractional range of the

Re: [time-nuts] Short term 10MHz source

Hi Luciano -- Thanks for posting that. There's a subtle point about the noise floor that's forever been on my list of things to investigate: the noise floor should be lower in timestamp mode than in time interval (A->B) mode. That's because in timestamp mode there is jitter contribution

Re: [time-nuts] Short term 10MHz source

Scott: You will need a reasonable 10 MHz frequency reference to use it. If you don't have a 10 MHz oscillator, GPSDO, or lab reference, you should consider something like the "Pulse Puppy" that TAPR also sells. --- Graham == > > ___ time-nuts mailing

Re: [time-nuts] Short term 10MHz source

Hi Paul, here the TICC noise floor. Regarding the GPS/TICC versus a good Rubidium standard like the HP5065A , you cannot apreciate the Rubidium ADEV stability lower than 10Kseconds. Luciano Da "time-nuts" time-nuts-boun...@lists.febo.com A "Discussion of precise time and

Re: [time-nuts] Short term 10MHz source

Hi John (and Bob), Thanks for clarifying (and for the bandwidth). As a direct result, I placed an order for a TICC and joined TAPR. 73 Scott W7SLS > On Jan 8, 2019, at 8:00 AM, John Ackermann N8UR wrote: > > Hi Scott -- > > The TICC is a fully-assembled "shield" that mounts on an Arduino

Re: [time-nuts] Short term 10MHz source

Hi Scott -- The TICC is a fully-assembled "shield" that mounts on an Arduino Mega 2560 controller. What you get from TAPR is the shield and Arduino with firmware loaded. The TICC talks to a host computer using ASCII on USB. John Miles' TimeLab software can read data directly from it, or you

Re: [time-nuts] Short term 10MHz source

Hi The “kit” comes fully assembled / tested and ready to go. Indeed see your local 3D printer for a case. Bob > On Jan 8, 2019, at 10:31 AM, W7SLS wrote: > >>> "Kits: TICC Timestamping/Time Interval Counter” >>> https://www.tapr.org/kits_ticc.html > > Is

[time-nuts] NixieCron by DIAMEX Germany

Elector magazine sent a notification of this solderless NixieCron clock kit by DIAMEX Germany. LEDs, light-pipes, and custom acrylics instead of Nixies. https://www.led-genial.de/NixieCron-M4-4-stelliger-Bausatz-mit-Sound YouTube of build, time synchronization, and operation.

Re: [time-nuts] Short term 10MHz source

>> "Kits: TICC Timestamping/Time Interval Counter” >> https://www.tapr.org/kits_ticc.html Is the TICC a kit in the sense that SMD and/or through-hole component soldering required? Or perhaps kit = no case, see your favorite 3D printer? Or? Thanks, Scott

Re: [time-nuts] Short term 10MHz source

> Hi All sorry for a new be question but > what is a TICC > regards Paul B UK Hi Paul, That is an acronym we often use here on time-nuts; one that a simple google search doesn't answer. Ok, there's "TIC" and there's "TICC". 1) A TIC (Time Interval Counter) is a common 2-input electronic

Re: [time-nuts] Short term 10MHz source

Hi It’s a cool little time interval counter: https://www.tapr.org/kits_ticc.html It’s one of a number of very useful TimeNut gadgets we can thank John Ackermann, our list administrator, and others for designing. Bob > On Jan 5, 2019, at 7:35 AM, Paul

Re: [time-nuts] Short term 10MHz source

Hi All sorry for a new be question but what is a TICC regards Paul B UK -Original Message- From: time-nuts [mailto:time-nuts-boun...@lists.febo.com] On Behalf Of Chris Burford Sent: 02 January 2019 03:56 To: Time Nuts List Subject: [time-nuts] Short term 10MHz source I have a situation