[time-nuts] If there a FAQ

[Chris Albertson]

You don't need hearing ability for low pitches.  As the beat frequency
gets lows it
it sounds like the volume is being pulsed.  Like something is playing
with the volume
knob once per second.

It is the same say you tune a musical instrument.    You listen for
volume modulation.
The two pitches either add constructively or destructively.  With good ears and
practice you can match to less then one Hz.   But "anyone" can get 2
Hz.   If you
are matching 10MHz oscillators that means 1E-7 just by ear.

Yes the best plan is to place the screw mid point because at beat match there is
literally no sound

On Mon, Nov 29, 2010 at 12:31 AM, Hal Murray <hmurray at megapathdsl.net> wrote:
>
>> I know I can zero-beat  it by ear and get within a couple Hz out of 10MHz.
>> That is better then 1E-6 simply by hand, ear and screwdriver. No computer.
>
> How do you get down to "a couple Hz"?  I thought most (young?) ears dropped
> out at about 20 Hz and I expect lots of radios chop off more than that just
> to get rid of noise.
>
> Can you center the screw between two I-hear-it spots?


-- 
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Chris Albertson
Redondo Beach, California