[time-nuts] If there a FAQ
alan.melia at btinternet.com
Mon Nov 29 11:11:24 UTC 2010
Oh Dear Hal how the old skills are lost when everything comes with digits on
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 :-))
----- 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
> > That is better then 1E-6 simply by hand, ear and screwdriver. No
> How do you get down to "a couple Hz"? I thought most (young?) ears
> out at about 20 Hz and I expect lots of radios chop off more than that
> 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
> 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
> 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
> 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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