#972

[@egbertgroot2737]

Thanks for recommending this prescaler .... i ordered a few as well

[@cocusar]

Excellent! I have one recommendation to add, which is the usage of a TCXO as the clock source of the timer you're using as a frequency meter. I understand this might be an overkill, but this will improve substantially the stability of the clock reference, and thus, your overall output frequency. If you fancy, you could get a TCXO with the same frequency as the main crystal and use it as the CPU clock source on the Atmel.

[@IMSAIGuy]

The original radio was not that fancy but a TCXO or oven would be an upgrade

[@tubeDude48]

This has been an interesting series!

[@KaivitiSingh]

Hello, in your schematic you have used digital pin 5 of Arduino Nano as input coming from the pre-scaler SAB-6456A. BUT you have NOT used this pin "5" in your Arduino sketch file the "Freq_Count_Board.ino" kept on Github. So this (.ino) will not produce any frequency display. I guess you have another working Arduino sketch which you have loaded on your Nano shown in clips. Please update your Github or give us links to your latest update.......

[@ligteltelecom]

What is the minimum input frequency that I can get from this IC?

[@azimyth1542]

Would it make more sense to put the protection diodes after C201?

[@IMSAIGuy]

yes probably

[@monchiabbad]

Do I see a dot-matrix printout ? Give us a demo of some printing..

[@mohsinsiddique2486]

Please make an arduino tx tone decoder like ctcss and dcs

[@HitAndMissLab]

what is the lowest frequency this setup will measure accuratelly?

[@braveheart5280]

Hello, Where did you buy the chips?

[@IMSAIGuy]

ebay

[@lenaafrike6896]

Yess good

[@kd9kck376]

Hm that chip is like a bunch of flip flops basically. As a flip flop can be used to divide a freq by 2.

[@IMSAIGuy]

that's right, it also has a differential analog input for small signals, and it can run to 1 GHz

[@xorfive]

PID loop?

[@arampak]

There is no need for PID, I think, as the inertia of the system is minimal: it will react almost immediately as the voltage changes. Instead, there should be some tolerance and the correction should be introduced only when the the frequency passes the tolerance threshold.

[@EngineeringVignettes]

Proportional with a weighted error should be fine. I have used that in the past to converge noisy input data to a decent enough minimal error. Simply done by computing the error and then multiplying that by a scalar smaller than one. Usually 1/10 to 1/100 depending on sampling rates and other factors. As the solution converges, the correction becomes so small that it's negligible. And of course this error is added to a linear model of the "plant" so that gives the system a good starting point to correct.

[@arampak]

@@EngineeringVignettes Seems like a good solution. My only concern is that constant and frequent correction will behave like an FM noise that makes no practical sense. That’s why I suggested a threshold.

[@t1d100]

Cool

[@davidjh7]

Not sure if you are interested, or allow any links, but I have a link to a really good frequency counter library I found a few years ago for the Arduino. Please let me know if you want the link.

[@IMSAIGuy]

I allow links but KZbin always blocks them. I hate the KZbin support. on my home page about tab is my email. you can sent it to me there. you can try to send it here. sometimes I can see it even though it gets blocked for everyone else

[@RideGasGas]

Where did you purchase this part? I looked at a few places and wasn't seeing such a nice low price.

[@IMSAIGuy]

www.ebay.com/itm/172223909753

[@RideGasGas]

@@IMSAIGuy Thanks, ordered a handful :) One project will be to extend the range of my HP 5315A frequency counter.

[@JBSATE]

codico com erro arduino