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" <[email protected]> To: "Discussion of precise time and frequency measurement" <[email protected]> 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. > > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
