int40 to string

Eddy71ua · Joined: 23 Sep 2009 Posts: 55 Location: Ukraine

I agree, the number is very large. But modern radio communications operate on very high frequencies. Normal WiFi operates at 5,600,000,000 or so frequencies. And that doesn't fit into 32 bits...
Sad

Ttelmah · Joined: 11 Mar 2010 Posts: 19538

Yes, but you then have to think of the real resolution. Normal crystals
only manage 10ppm. So taking a reading with more than 5 digits is
basically fallacious. Even a TCXO will normally only go to 1ppm. So 6
usable digits. A good OCXO can push you to 0.05PPM, so 7.5 usable
digits of resolution. It is fundamentally pointless to be handling and counting
more digits than actually mean anything. You appear to be trying to
achieve resolution beyond your actually accuracy. Needs thinking about....

Eddy71ua · Joined: 23 Sep 2009 Posts: 55 Location: Ukraine

As a reference oscillator is used quality TCXO 10 MHz + calibration by GPS-receiver.

temtronic · Posted: Wed Jun 21, 2023 5:03 am

I'd still like a 'link' to the actual 'counter code'/ article / hardware. Most frequency counters I've seen/ made over the decades had 'ranges' based upon frequency of interest, so I'm curious as to how your 'counter code' actually samples a 5GHz signal down to the Hz.

Eddy71ua · Joined: 23 Sep 2009 Posts: 55 Location: Ukraine

I can't show you the code. But nothing revolutionary. The ADF4106 prescaler is used to work with the upper ranges. And of course mathematical processing of the accumulated results.

PrinceNai · Joined: 31 Oct 2016 Posts: 480 Location: Montenegro

I'm not that much interested in the code or hardware. I'd just like to see those five bytes and into what they need to translate. So input and the desired output.

Ttelmah · Joined: 11 Mar 2010 Posts: 19538

This library:
[url]
https://www3.cs.stonybrook.edu/~skiena/algorist/book/programs/bignum.c
[/url]

I have used before, and does compile OK in CCS (be careful, remember
CCS default integer is unsigned, and this requires 'int' to be signed).

temtronic · Posted: Thu Jun 22, 2023 6:15 am

hmmm, isn't this the exact thing that 'AI' everyone raves about is supposed to be able to do ???

I agree with the Prince, gotta SEE the input data to decide how best to convert to desired output.

Ttelmah · Joined: 11 Mar 2010 Posts: 19538

Yes, some real data about the layout of the bytes is really essential to
answering at all well....