开云体育

I have missed that, time to get a proper digital scope and actually see what happens to Si5351 output ... [email protected]> wrote:

12 MHz and 24 MHz. are not just a direct divide from the 48 MHz. clock.? They also stretch the clock pulse output periodically to get the frequency accurately synced to the GPS timing. If you quickly

Hi Elia, That is just too cool. I had to scratch build a V-O-M when I was a teenager (or live without one). I made mine in a cigar box with an old mil surplus meter. The shunt and series resistors all

Good day everyone, Just thought I would share something I started during the lockdown, nothing new or revolutionary but it has kept me entertained :) My Fluke 77 has served me well since 1984 but is

Erik, I just built this after receiving a NEO-M8N and have the following observation: Occasionally, the 1pps from the GPS skips and the software goes bonkers with a large error and makes a big step

I've implemented and tested deconvolution. Step 1: Measure the response to a single signal and use that as the deconvolution filter Step 2: Measure the convoluted response to multiple signals Step 3:

Interesting. This sounds like a one dimensional version of what Photoshop does to photos to sharpen up somewhat blurry photos in two dimensions. Not introducing artifacts might be the biggest

Please add a picture of the board -- HBTE Files section: /g/HBTE/files Erik, PD0EK

Hello i recently bought a chinese pll adf4351 evaluation board and used the belt with arduino nano my programmed frequency 2.514 GHz with + 5db output works but looking with the spectrum analyzer i

From this system -- HBTE Files section: /g/HBTE/files Erik, PD0EK

I'm not quite sure what you mean with clock stretching, 24MHz and other usable frequencies are a direct divide from the internal 48MHz clock? The phase noise is not that great but not that terrible

Hi Indeed phase noise is an important issue. So are spurious as Sverre, LA3ZA shows here: https://la3za.blogspot.com/2019/05/more-spurs-than-i-had-hoped-for.html Karen, RA3APW has also a page about

The 24MHz pulse has a terrible phase noise making the output of the SI5351 equally unusable as the 24MHz output of the neo-7M itself -- HBTE Files section: /g/HBTE/files Erik, PD0EK

When measuring the output there are for me some important spec points. 1: Phase noise. With the SI5351 this is ok when using a real crystal and not the 24MHz from a neo-7m as there is clock stretching

Did you by any chance compare this solution to simply feeding the si5351 with 24MHz "pps" output from neo7? I have no means of evaluating the precision, except for comparing to some on the air

Hi Aren't you confusing accuracy with stability? Long averaging does not improve stability over the duration of the measurement period. E.g. the mains frequency is 50 Hz over 24 h but in between it

Thanks Erik, I’ll take a look at your software and see if I can adapt it to my i2s display. Sverre LA3ZA

Every time the error is measured and the error is above the threshold (which is 1.5 times the minimum observable error) the frequency is corrected. In the original SW this measurement and correction

I also built the F2DC GPS-controlled oscillator some time ago and wrote about it on my blog, https://la3za.blogspot.com/2020/09/gps-corrected-10-mhz-reference.html I’ve found however that it makes

Yes. With an VCOXCO you can do better but the goal was not to use an oxco and still have a factor 100 better performance than any regular free running .2 ppm oxco so I can be used to check and