); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Everyone on the 'net agrees on the frequency of the Caesium oscillation, but the precise frequency quoted for Rubidium varies by a few Hz :-( Now I realise that you can make it anything you like (within reason) by altering the magnetic field, and perhaps different sources quote different figures which are more or less easy to synthesise?
On the (USA) NIST web-page (http://tf.nist.gov/general/enc-re.htm#rubidiumoscillator) they quote 6,834,682,608 Hz, but the (German) PTB (on http://www.ptb.de/en/org/4/44/441/info2_e.htm) give 6,384,682,612.8 Hz, and the (British) NPL quotes 6,834,682,610.904 324 Hz in a powerpoint presentation http://www.npl.co.uk/time/club/meeting1/secondaryrepsec.pdf (admittedly for a Rubidium fountain). I have also seen the frequency of a Hydrogen Maser given as both 1,420,405,751 Hz and ...752 Hz. I would be very surprised if the frequency was an exact whole number of Hertz different from Caesium, so perhaps this is just rounded for convenience as again it can be steered to anywhere you like? Would anyone care to comment on this differences please? Thank you, Peter Vince (G8ZZR, London) _______________________________________________ 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.
