[time-nuts] BG7TBL FA1 frequency analyzer

[Anders Wallin]

maybe the measurement principle is similar to the PicoPak?
http://www.stable32.com/PicoPak%20App%20Notes%20Links.htm

Do open it up! And send a high resolution picture to the ist ;)

A.


On Sat, Aug 31, 2019 at 1:11 AM Mark Sims <holrum at hotmail.com> wrote:

> (Hopefully this is not a duplicate post...  hotmail has been having issues)
>
> The FA1 is a small, USB powered frequency counter.   You supply it with a
> 10 MHz reference and an input frequency of 1 .. 80 MHz.   It outputs a text
> string of the measured frequency every second.  They cost around $80 ..
> $120.
>
> Apparently there is a PLL inside... the text string has a "PLL unlock"
> flag.  There is no info on how it works and I have not opened mine up.
>
> I did a simple noise test on one where the input and ref clocks were from
> a Tbolt.  It looks like the measurement noise is around +/- 0.0002 Hz.
>
> Lady Heather can now read it.  Attached is a screen capture of the noise
> test._______________________________________________
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