[time-nuts] If there a FAQ

[Alan Melia]

Oh Dear Hal how the old skills are lost when everything comes with digits on
it :-))
You put the BFO on and you do a 3 signal beat, which can be set to 0.1 Hz
quite easily by listening to the "swell". This is 1 in 10^8 at 10MHz !! Ah I
am showing my age again :-))
Alan G3NYK

----- Original Message ----- 
From: "Hal Murray" <hmurray at megapathdsl.net>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Sent: Monday, November 29, 2010 8:31 AM
Subject: Re: [time-nuts] If there a FAQ


>
> > 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?
>
>
> > I figure my first upgrade is to replace the crystal with a temperature
> > compensated oscilator chip.   Now to go find one.
>
> Don't get too focused on TCXOs.  You are just as likely to find a low cost
> OCXO.
>
> While you are looking, keep an eye open for a TBolt or Z3801A.  (or one of
> the Z38xxA variations)  If you find one at a reasonable price, they have
an
> incredible price/performance ratio.  If you hang around here for long, you
> will probably get one anyway.  Unless you like the sort of fiddling you
have
> described, getting one now will save you a lot of time/effort.
>
>
>
>
>
> -- 
> These are my opinions, not necessarily my employer's.  I hate spam.
>
>
>
>
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