RE: LF: EbNaut at 8270.01953125

[Jacek Lipkowski <sq5bpf@lipkowski.org>]

On Tue, 9 Jan 2018, David Weinreich wrote:

> My question is how long does it take to measure 8270.01953125 Hz? Based on my 
> experience, it
> seems that it would take more than 3 years. Where am I going wrong.
consider a "hardware" example:

you can do the stuff that most frequency counters do: they have two 
inputs: a slow reference clock (like 1Hz, which gives 1Hz measurement 
resolution), and the measured frequency input. you count the number of 
input cycles every reference clock pulse. to correctly measure 
8270.01953125 Hz you need a 0.00000001 Hz reference (which is one cycle 
per 100000000 seconds, or 3.17 years).
but you can do it the other way, just exchange the frequency counter 
inputs: have a fast reference clock, and count the number of the reference 
cycles every input frequency cycle. this way the measurement takes one 
input cycle (1/8270 seconds), the faster the reference clock, the more 
resolution you have.

VY 73

Jacek / SQ5BPF