----- Original Message ----- From: "Bruce Griffiths" <[EMAIL PROTECTED]> To: "Discussion of precise time and frequency measurement" <[email protected]> Sent: Thursday, December 13, 2007 6:08 PM Subject: Re: [time-nuts] need recomendation for a portable 10mhz reference oscilator
> Magnus Danielson wrote: > > > Why would it be very hard? For his purpose it should easy enought to measure > > > the frequency shift which he would allow, and achieving the necessary shift in > > > temperature to get the ball-park aspect should not be too hard to acheive in a > > > home enviorment and a thermometer. > > > > > > I am sure the E1938A would pull it off. > > > > > > Talking about E1938A. Where can I find one??? > > > > > > Cheers, > > > Magnus > > > > > > > > > Hej Magnus > > The test sheet on a typical (sample size of 1) E1938A test sheet states > among other things > Max slope near 0.T, 0 mHz/degree. (ie tempco < 1E-13/degree) > So in practice, depending on what equipment is available, the > measurement of the frequency change is likely to be extremely challenging. > At best it may be possible to state that the frequency change is less > than 1E-11 (substitute actual measurement resolution/accuracy limits). > > For an E1938A try bidding on one of the Australian sourced Z3815A's > that keep popping up on ebay (however bids are relatively high). > > Bruce For those that wanted the HP "hockey puck" oscillator, one is one ebay now but is closing in hours. GPS Locked, 10 MHz Frequency Standard, HP Z3815A/E1938A http://search.ebay.com/330196691921 The man apparently had two of these units, the first one sold for 1725.00, this one is up to 1005.00 now. It would make a nice Christmas present ! _______________________________________________ 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.
