[sdiy] frequency counter

[harrybissell]

OTOH... any resonable high frequency crystal and the right division ratio
would come acceptably CLOSE to A-440.  Much closer than almost ANY of
our test methods would require... (even .1% would be easy)

H^) harry

Ian Fritz wrote:

> At 07:22 PM 6/26/2004, mark verbos wrote:
> >What crystal frequency did you use to get an A440? I have been tinking
> >about this over the last week and haven't seen any that seemed right for it.
>
> Hi Mark --
>
> I used a 4.40 MHz xtal and an RF oscillator kit that I got from places that
> used to advertise in ham radio magazines.  This was many years ago, so
> probably they aren't around any more.  But I think last time this came up I
> was able to find someplace on the www that would grind custom xtals.
>
>    Ian